Progress in Solid State Chemistry最新文献_第3页

Engineering Eu3+-activated molybdenum tellurates via alkali metal co-doping for enhanced luminescence in advanced lighting and security ink applications 工程Eu3+活化碲酸钼通过碱金属共掺杂增强发光在先进的照明和安全油墨应用

IF 10.5 2区化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR

Progress in Solid State Chemistry

Pub Date : 2026-02-01 Epub Date: 2026-03-03 DOI: 10.1016/j.progsolidstchem.2026.100575

Asif Ali Haider , Weigang Wang , Xianchen Huang , Jianguo Jia , Yuxin Liu , Bowen Wang , Jingkai Quan , Wei Qian , Dandan Gao , Jianqiang Wang , Jing Zhu

Eu³⁺-activated red-emitting phosphors are of sustained interest for multifunctional applications. However, their poor stability under harsh conditions, such as high temperatures and aqueous environments, critically limits their advancement in lighting and optical security technologies. Herein, the molybdenum tellurate Ca₃(TeO₃)₂(MoO₄) (CTMO) is activated by Eu³⁺ for the first time, realizing bright red emission with high stability. In parallel, to reduce defect-induced non-radiative transitions due to the non-equivalent substitution of Eu³⁺ for Ca²⁺, the enhancement of co-doping alkali metal (A⁺ = Li⁺, Na⁺, K⁺) on the red luminescence is demonstrated thoroughly. The incorporation of the co-dopant Na⁺ delivers a 3-fold enhancement in emission intensity, along with a 1.56-fold increase in quantum efficiency. Besides, the optimized CTMO:Eu³⁺,Na⁺ powder exhibits improved luminescence stability at high temperature. When incorporated into a white-lighting device, warm white light with low correlated color temperature (CCT = 3775 K) is achieved. Meanwhile, the security ink is prepared by dispersing the resulting powder into polydimethylsiloxane (PDMS) matrix, enabling screen printing, coating, and handwriting to create security patterns on various substrates (woven/non-woven fabrics, paper, glass, and plastic sheets). The ink retains bright luminescence after immersion in water for 40 days. This investigation significantly boosts the multifunctional applicability of Eu³⁺-activated red-emitting phosphors for lighting and long-lasting optical security.

Eu3+激活的红色发光荧光粉是多功能应用的持续兴趣。然而，它们在高温和水环境等恶劣条件下的稳定性差，严重限制了它们在照明和光学安全技术方面的进步。其中，碲化钼Ca3(TeO3)2(MoO4) （CTMO）首次被Eu3+活化，实现了高稳定性的亮红色发射。同时，为了减少由于Eu3+非等效取代Ca2+而引起的缺陷引起的非辐射跃迁，共掺杂碱金属（A+ = Li+, Na+, K+）对红色发光的增强得到了充分证明。共掺杂剂Na+的加入使发射强度提高了3倍，量子效率提高了1.56倍。此外，优化后的CTMO:Eu3+，Na+粉体在高温下具有更好的发光稳定性。当并入白光照明装置时，可获得低相关色温（CCT = 3775 K）的暖白光。同时，通过将生成的粉末分散到聚二甲基硅氧烷（PDMS）基质中来制备安全油墨，使丝网印刷，涂层和手写能够在各种基材（编织/无纺布，纸张，玻璃和塑料布）上创建安全图案。墨水在水中浸泡40天后仍能保持明亮的发光。该研究大大提高了Eu3+激活的红色发光荧光粉在照明和持久光学安全性方面的多功能适用性。

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引用次数: 0

Transformation from ultradense/ultrahard/weakly-metallic sql-C6 to dense/superhard/insulating Diamond-like dia-C8 inscribed in a series of “C4+2m” allotropes (m: odd or even integer); Crystal Chemistry and DFT investigations 从超致密/超硬/弱金属的sql-C6到致密/超硬/绝缘的“C4+2m”同素异形体（m：奇数或偶数）镶嵌的类金刚石dia-C8；晶体化学和DFT研究

IF 10.5 2区化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR

Progress in Solid State Chemistry

Pub Date : 2026-02-01 Epub Date: 2026-02-05 DOI: 10.1016/j.progsolidstchem.2026.100573

Samir F. Matar

In the orthorhombic system, starting from inserting carbon into ultra-dense/ultrahard/metastable/metallic novel C₆ with distorted C4 tetrahedra, a dense/superhard/stable/insulating C₈, with regular C4 tetrahedra was found and characterized with properties close to Diamond. Such C₆→ C₈ transformation was then inscribed within an original protocol establishing systematics in “C_4+2m” 3D stoichiometries in relation with Diamond, featuring regular tetrahedra/versus distorted tetrahedra allotropes, where m is an odd or even integer. Odd m values lead to superdense, ultrahard, metastable C₆, C₁₀, C₁₄ whereas m even values give superhard Diamond-like stable C₄, C₈, C₁₂. The obtained dia-C₄, sql-C₆, dia-C₈, 4²T1164-HZ C₁₀, dia-C₁₂ sequence alternates from one type to the other with increasing amounts of carbon. Such findings are proposed as a holistic vision of carbon allotropes characterized by exceptional mechanical and electronic properties.

在正交体系中，从将碳插入到具有扭曲C4四面体的超致密/超硬/亚稳/金属新型C6中开始，发现了具有规则C4四面体的致密/超硬/稳定/绝缘C8，并具有接近金刚石的性能。这样的C6→C8变换随后被写入与Diamond相关的“C4+2m”3D化学计量学系统建立的原始协议中，具有正四面体/与扭曲四面体同素异形体，其中m是奇数或偶数整数。奇数m值产生超致密、超硬、亚稳的C6、C10、C14，而偶数m值产生超硬、稳定的类金刚石C4、C8、C12。得到的dia-C4、sql-C6、dia-C8、42T1164-HZ、C10、dia-C12序列随着碳量的增加从一种类型交替到另一种类型。这些发现被提出作为碳同素异形体的整体愿景，其特点是特殊的机械和电子特性。

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引用次数: 0

Advances in solid-state lithium–sulfur batteries for next-generation energy storage 下一代储能用固态锂硫电池的研究进展

IF 10.5 2区化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR

Progress in Solid State Chemistry

Pub Date : 2026-01-01 Epub Date: 2025-11-29 DOI: 10.1016/j.progsolidstchem.2025.100552

Vennila Selvaraj , Baeksang Yoon , Suresh Sagadevan , Byoenghun Oh , Sangwon Noh , Dong Ick Son , Hyung-Kee Seo , Inseok Seo

The increasing demand for high-performance energy storage has intensified the pursuit of alternatives to conventional lithium-ion batteries. Lithium-sulfur (Li–S) batteries has been extensively used due to their high theoretical energy density (2600 Wh kg⁻¹), low cost, and sulfur's environmental benefits. However, traditional Li–S systems face challenges including polysulfide shuttle effects, lithium dendrite formation, and limited cycle life. Incorporating solid-state electrolytes (SSEs) have enhanced the safety and stability by replacing flammable liquids. Recent progress in solid-state Li–S (SSLS) batteries includes development of high-conductivity SSEs (sulfide, halide, polymer-ceramic composites), electrodes provided with the volume changes and minimize interfacial resistance, and improved cathode architectures for optimized ion/electron transport. This review comprehensively analyzes the development in solid-state lithium-sulfur (SSLS) batteries over the past decade. SSLS development is driven by the potential for higher energy density and enhanced safety that have been essential for next-generation energy storage.This review also focuses on solid electrolytes as the key enabler for solid-state lithium-sulfur (SSLS) battery performance, addressing the challenges associated with liquid electrolytes such as flammability, polysulfide shuttle, and lithium dendrite formation. Finally, the review highlights the importance of integrated cell design, where optimized electrode architectures and advanced solid electrolytes work synergistically to maximize performance..

对高性能储能的需求日益增长，促使人们寻求替代传统锂离子电池的方法。锂硫（Li-S）电池因其理论能量密度高（2600 Wh kg−1）、成本低和硫的环境效益而得到广泛应用。然而，传统的Li-S系统面临着多硫化物穿梭效应、锂枝晶形成和有限的循环寿命等挑战。加入固态电解质（sse）取代易燃液体，提高了安全性和稳定性。固态Li-S （SSLS）电池的最新进展包括开发高导电性的ssi（硫化物、卤化物、聚合物-陶瓷复合材料），提供体积变化和最小化界面电阻的电极，以及改进阴极结构以优化离子/电子传输。本文综合分析了近十年来固态锂硫电池的发展情况。SSLS的发展受到更高能量密度和增强安全性的潜力的推动，这对下一代储能至关重要。本文还重点介绍了固体电解质作为固态锂硫（SSLS）电池性能的关键推动因素，解决了与液体电解质相关的挑战，如可燃性、多硫化物穿梭和锂枝晶形成。最后，综述强调了集成电池设计的重要性，其中优化的电极结构和先进的固体电解质协同工作以最大限度地提高性能。

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引用次数: 0

Recent synthetic approaches for high-entropy polyelement nanoparticles 高熵多元纳米粒子的合成新方法

IF 10.5 2区化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR

Progress in Solid State Chemistry

Pub Date : 2026-01-01 Epub Date: 2025-12-04 DOI: 10.1016/j.progsolidstchem.2025.100559

Wail Al Zoubi , Park Jaehyung , Mohammad R. Thalji , Chinho Park , Adnan Deep , Nokeun Park

High-entropy polyelement nanoparticles (HEPNs) exhibit unique behaviors distinct from those of the solid phases of individual elements. The disordered nature of multielement compounds introduces structural complexity and unprecedented compositional variations, necessitating a comprehensive understanding of stabilization enthalpy, entropy, and property optimization. HEPNs are particularly desirable when fabrication methods provide precise control comparable to that achieved conventional alloy design. Recent advancements in fabrication techniques have enabled greater control over the inherently disordered structures of HEPNs. This study explores emerging strategies for synthesizing HEPNs with tunable compositions, tailored atomic configurations, and enhanced catalytic activity achieved through the formation of novel active catalytic sites. It discusses fabrication pathways for different types of HEPNs, their stabilization mechanisms, and catalytic performance, providing insights into how of various synthesis approaches influence these properties. Collectively, these strategies enable the rational design and predictable controlled modulation of catalytic activity and atomic order within the disordered lattice, establishing a basis for enhanced applications.

高熵多元素纳米粒子（HEPNs）表现出不同于单个元素固相的独特行为。多元素化合物的无序性引入了结构复杂性和前所未有的组成变化，需要对稳定焓、熵和性能优化有全面的了解。当制造方法提供与传统合金设计相当的精确控制时，HEPNs尤其可取。最近制造技术的进步使得对hepn固有的无序结构有了更好的控制。本研究探索了通过形成新的活性催化位点来合成具有可调成分、定制原子构型和增强催化活性的HEPNs的新策略。它讨论了不同类型HEPNs的制备途径，它们的稳定机制和催化性能，提供了各种合成方法如何影响这些性能的见解。总的来说，这些策略使得在无序晶格内的催化活性和原子顺序的合理设计和可预测的控制调制成为可能，为增强应用奠定了基础。

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引用次数: 0

Site preference identification and crystal field analysis of high-efficient and thermal-stable NIR-I emission in NaAl11O17:Fe3+: experimental and DFT investigation NaAl11O17:Fe3+中高效热稳定NIR-I发射的位置优选与晶体场分析：实验与DFT研究

IF 10.5 2区化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR

Progress in Solid State Chemistry

Pub Date : 2025-12-01 Epub Date: 2025-11-21 DOI: 10.1016/j.progsolidstchem.2025.100551

Chunli Li , Linyun Zeng , Irina I. Piyanzina , Ziyi Hong , Wenjia Xie , Peican Chen , Liya Zhou , Chunyan Zhou , Jialiang Pan , Wei Liu , Weitao Ren , Xinguo Zhang

Presently Fe³⁺-doped NIR phosphors exhibit immense potential for multiple applications. However, a more comprehensive understanding of Fe³⁺ site-occupancy and luminescent mechanism is urgently needed for enhancing material design and synthesis. In this work, a high-efficient NIR-I emitting Fe³⁺-doped NaAl₁₁O₁₇ phosphor was synthesized and systematically studied. A hybrid density functional theory (DFT) calculation was performed on geometric and electronic structures to study Fe³⁺ occupation preference and the corresponding optical properties. It is found that Fe³⁺ prefers to occupy AlO₄ sites with lower total energy compared with AlO₆ sites. Under 340 nm excitation, NaAl₁₁O₁₇: Fe³⁺ phosphors exhibited a high-efficient NIR emission of 600∼1000 nm peaking at ∼770 nm, with a high internal quantum efficiency of 78.12 %. Based on both theoretical and experimental results, the 3d energy-level diagram of Fe³⁺ in NaAl₁₁O₁₇ is constructed and discussed with crystal field strength analysis. The optimal NaAl₁₁O₁₇: Fe³⁺ phosphor shows good thermal stability while keeping 87 and 45 % of room-temperature intensity at 373 and 473 K. A NIR pc-LED was fabricated and demonstrates applications in nondestructive detection and angiography. This hybrid investigation on Fe³⁺-doped NaAl₁₁O₁₇ NIR-I phosphor could provide an insight for developing Fe³⁺-activated NIR luminescent materials with excellent performance and expanding their application prospects.

目前，Fe3+掺杂的近红外荧光粉具有广泛的应用前景。然而，为了提高材料的设计和合成水平，迫切需要更全面地了解Fe3+的占位和发光机理。本文合成了一种高效发射NIR-I的Fe3+掺杂NaAl11O17荧光粉，并对其进行了系统的研究。采用混合密度泛函理论（DFT）对几何结构和电子结构进行了计算，研究了Fe3+的占位偏好和相应的光学性质。结果表明，与AlO6位点相比，Fe3+更倾向于占据总能量较低的AlO4位点。在340 nm激发下，NaAl11O17: Fe3+荧光粉表现出600 ~ 1000 nm的高效近红外发射，在770 nm处达到峰值，具有78.12%的高内量子效率。基于理论和实验结果，构建了NaAl11O17中Fe3+的三维能级图，并用晶体场强分析对其进行了讨论。最优的NaAl11O17: Fe3+荧光粉在373和473 K时的热稳定性分别为室温强度的87%和45%。制作了一种近红外pc-LED，并展示了其在无损检测和血管造影中的应用。本文对Fe3+掺杂NaAl11O17 NIR- i荧光粉的杂化研究，为开发性能优异的Fe3+活化近红外发光材料和拓展其应用前景提供了新的思路。

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引用次数: 0

Pressure-induced stereochemistry and lone pair (E) localization in BiF3: Ellipsoidal EBi 6s2 / EF 2s2 volumes, perichoresis, and phase transitions 压力诱导的立体化学和孤对(E)定位在bi3：椭球状ebi6s2 / EF 2s2体积，包膜和相变

IF 10.5 2区化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR

Progress in Solid State Chemistry

Pub Date : 2025-12-01 Epub Date: 2025-11-15 DOI: 10.1016/j.progsolidstchem.2025.100550

Samir F. Matar , Alicia Castro , Jean Galy

This original work investigates the high-pressure behavior of BiF₃ polymorphs, with emphasis on the stereochemical activity and spatial localization of the 6s² lone electron pair (E) of Bi³⁺and the 2 s² Es of fluoride anions. Using density functional theory (DFT) and electron localization function (ELF) analyses, we characterize the evolution of α-, β-, and γ-BiF₃E polymorphs and report two novel high-pressure phases, δ-BiF₃E and κ-BiF₃E, stabilized at approximately 70 GPa and above 200 GPa, respectively. The β-phase undergoes a clear phase transition near 70 GPa, where structural gliding of fluorine layers induces a symmetry shift from Pnma to Cmcm space group, corresponding to the δ-BiF₃E phase. The δ-phase features a base-centered orthorhombic framework with perichoretic localization of the Bi 6s² lone pair in multiple spatial positions. At pressures exceeding 200 GPa, a previously unobserved polymorph, κ-BiF₃E, emerges with a penta-capped triangular antiprismatic coordination environment and a distorted screw-axis symmetry.

In this paper “perichoresis” is introduced as an original conceptual tool to describe the simultaneous localization of lone pairs in multiple spatial domains without invoking electronic delocalization.

The results provide insight into the high-pressure stereochemistry of heavy p-block compounds and offer a predictive model for lone pair behavior under compression.

本文研究了Bi3多晶态的高压行为，重点研究了Bi3+的6s2孤电子对(E)和氟离子的2s2 Es的立体化学活性和空间定位。利用密度泛函理论（DFT）和电子定位函数（ELF）分析了α-、β-和γ-BiF3E多晶型的演化特征，并报道了两个新的高压相δ-BiF3E和κ-BiF3E，它们分别稳定在约70 GPa和200 GPa以上。在70 GPa附近，β-相发生了明显的相变，氟层的结构滑动导致从Pnma到Cmcm空间群的对称位移，对应于δ-BiF3E相。δ相以碱基为中心的正交骨架为特征，Bi 6s2孤对在多个空间位置呈鞘周定位。在超过200gpa的压力下，一种以前未观察到的多晶体κ-BiF3E出现，具有五盖三角形反棱镜配位环境和扭曲的螺旋轴对称。本文提出了一种新颖的概念工具，即“外包电泳”来描述在多个空间域中孤对的同时定位，而无需调用电子离域。该结果为重p-嵌段化合物的高压立体化学提供了新的见解，并为压缩下的孤对行为提供了预测模型。

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引用次数: 0

Insight into Bi-Sb alloys and their chalcogenide compounds for sodium/potassium ion battery (SIB/PIB) anodes 钠/钾离子电池（SIB/PIB）阳极用Bi-Sb合金及其硫系化合物的研究

IF 10.5 2区化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR

Progress in Solid State Chemistry

Pub Date : 2025-12-01 Epub Date: 2025-09-03 DOI: 10.1016/j.progsolidstchem.2025.100545

Defei Li, Ming-Chun Zhao, Tong Yuan, Ke Cui, Fuqin Zhang

Sodium/potassium ion batteries (SIBs/PIBs), emerging as promising alternatives to lithium-ion batteries (LIBs), show great potential in large-scale electrical energy storage systems owing to their abundant reserves, potential cost advantages, and low standard redox potentials. In recent years, Bi-Sb alloys and their chalcogenide compounds (sulfides, selenides, and tellurides) have garnered significant attention due to their unique bimetallic synergistic effects and tunable energy storage mechanisms. This paper reviews the recent progress in Bi-Sb alloys and their chalcogenide compounds as anode materials for SIBs and PIBs. Highlighting the synergistic effects of Bi-Sb systems, the study emphasizes their high theoretical capacity, reduced volume expansion, and enhanced structural stability compared to monometallic counterparts. Key strategies such as nano-structuring (e.g., nanoporous and 2D layered architectures), composite engineering (e.g., carbon-based matrices), and heterostructure design are discussed to address challenges like electrode pulverization. The electrochemical mechanisms, including multi-step alloying and conversion reactions, are analyzed to elucidate performance enhancements in terms of cycling stability, rate capability, and capacity retention. Specifically, the paper examines the structural properties, modification strategies, and performance optimization mechanisms of these materials, and identifies key pathways for their engineering applications, aiming to provide theoretical support and technological references for designing high-capacity anode materials for SIBs/PIBs. Additionally, critical issues, challenges, and prospects for further development are suggested. This work provides critical insights into material design principles and offers pathways for developing next-generation, cost-effective energy storage technologies.

钠/钾离子电池（SIBs/PIBs）作为锂离子电池（LIBs）的潜在替代品，由于其储量丰富、潜在的成本优势和低标准氧化还原电位，在大规模电能存储系统中显示出巨大的潜力。近年来，铋锑合金及其硫族化合物（硫化物、硒化物和碲化物）因其独特的双金属协同效应和可调的储能机制而受到广泛关注。本文综述了近年来铋锑合金及其硫族化合物作为SIBs和PIBs阳极材料的研究进展。该研究强调了Bi-Sb体系的协同效应，与单金属体系相比，它们具有更高的理论容量、更小的体积膨胀和更高的结构稳定性。讨论了纳米结构（如纳米多孔和二维层状结构）、复合材料工程（如碳基矩阵）和异质结构设计等关键策略，以解决电极粉化等挑战。分析了电化学机制，包括多步合金化和转化反应，以阐明在循环稳定性，速率能力和容量保持方面的性能增强。具体而言，本文研究了这些材料的结构特性、改性策略和性能优化机制，并确定了其工程应用的关键途径，旨在为sib / pib高容量阳极材料的设计提供理论支持和技术参考。此外，还提出了关键问题、挑战和进一步发展的前景。这项工作为材料设计原理提供了重要的见解，并为开发下一代具有成本效益的储能技术提供了途径。

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引用次数: 0

Temperature-induced structural phase transitions in inorganic compounds: symmetry and information-entropy analysis 无机化合物中温度诱导的结构相变：对称性和信息熵分析

IF 10.5 2区化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR

Progress in Solid State Chemistry

Pub Date : 2025-12-01 Epub Date: 2025-09-10 DOI: 10.1016/j.progsolidstchem.2025.100547

Sergey V. Krivovichev

The tendency of crystal-structure symmetry increasing under increasing temperature (also known as a ‘Landau rule’) is one of the major empirical observations with regard to the temperature-induced phase transitions. The validity of the rule was investigated by means of the statistical analysis of the 502 temperature-driven phase transitions in inorganic compounds with known crystal-structure information for all polymorphs. The analysis was performed from the viewpoint of symmetry considerations (that is, the analysis in terms of the crystal-system hierarchy, where cubic system is the highest and triclinic is the lowest) and information-entropy calculations. It was revealed that the information-based structural complexity parameters (most importantly, the total information content per reduced unit cell) are more sensitive structural symmetry indicators than the symmetry classification in terms of the crystal-system hierarchy. The information-entropy measures decrease under increasing temperature in more than 77 % of phase transitions under consideration, which corresponds to the overall rise of symmetry under heating (the ‘Landau rule’). In contrast, the simple symmetry analysis confirms the ‘Landau rule’ in 60 % of cases only. The information-based parameters are especially efficient for the cases, when crystal system does not change (most numerous are monoclinic-monoclinic and orthorhombic-orthorhombic transitions). The deviations from the rule of increasing symmetry correspond to: phase transition sequences with intermediate (transitional) structures of high complexity, isosymmetric and reentrant phase transitions, and transitions that involve low-temperature metastable polymorphs. There are some exceptions that cannot be assigned to any of the phase-transition types mentioned above, where symmetry is decreasing under heating. The symmetry breaking results in the decrease in vibrational entropy, which may be considered as a major driving force behind the ‘Landau rule’. However, various phenomena such as formation and breaking of bonds, charge and orbital ordering, stereoactive activity of lone electron pairs, etc., may seriously influence polymorphic transformations under temperature changes.

晶体结构对称性随温度升高而增加的趋势（也称为“朗道规则”）是关于温度诱导相变的主要经验观察之一。通过对已知晶体结构信息的无机化合物中502个温度驱动相变的统计分析，验证了该规律的有效性。分析是从对称考虑的角度进行的（即，根据晶体系统层次结构进行分析，其中立方系统最高，三斜系统最低）和信息熵计算。结果表明，基于信息的结构复杂性参数（最重要的是每个简化的单位胞的总信息量）是比对称分类更敏感的结构对称性指标。在考虑的相变中，超过77%的信息熵测量值随着温度的升高而降低，这对应于加热下对称性的整体上升（“朗道规则”）。相比之下，简单的对称分析只在60%的情况下证实了“朗道规则”。在晶体系统不发生变化的情况下（大多数是单斜-单斜和正交-正交转变），基于信息的参数特别有效。与增加对称性规则的偏离对应于：具有高复杂性的中间（过渡）结构的相变序列，等对称和可重入的相变，以及涉及低温亚稳态多晶的相变。有一些例外不能被分配到上述任何相变类型，其中对称性在加热下下降。对称性破缺导致振动熵的减少，这可能被认为是“朗道规则”背后的主要驱动力。然而，各种现象，如键的形成和断裂、电荷和轨道的排序、孤电子对的立体活性等，都可能严重影响温度变化下的多晶转变。

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引用次数: 0

Synthesis, structure and properties of substituted cobalt chalcogenides Co7(Se,Te)8 取代钴硫族化合物Co7(Se,Te)8的合成、结构与性质

IF 10.5 2区化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR

Progress in Solid State Chemistry

Pub Date : 2025-12-01 Epub Date: 2025-09-16 DOI: 10.1016/j.progsolidstchem.2025.100548

D.F. Akramov , N.V. Selezneva , E.M. Sherokalova , D.K. Kuznetsov , V.A. Kazantsev , N.V. Baranov

For the first time, polycrystalline samples of Co₇(Se_1–yTe_y)₈ were synthesized in the entire concentration range (0 ≤ y ≤ 1) and studied by X-ray diffraction, scanning electron microscopy, and by thermal expansion, specific heat capacity and electrical resistivity measurements. Depending on the concentration of tellurium, the solid-phase reaction method (at y < 0.9) and melting method (at y ≥ 0.9) were used to obtain single-phase samples. A change in the crystal structure (P3₁21 → P-3m1 → P6₃/mmc → P-3m1) due to the disordering of vacancies, significant anisotropy of the thermal atomic displacement, and anisotropic lattice expansion have been observed in this system when selenium is substituted with tellurium. According to specific heat measurements, an increase in tellurium concentration is accompanied by a decrease in the electronic specific heat coefficient, which indicates an increase in the metallicity of the system and is confirmed by electrical resistivity data. In substituted compounds using thermal expansion and temperature-dependent X-ray diffraction, spinodal decomposition of samples was detected upon heating. The second phase in dendritic form was observed using scanning electron microscopy on the surface of slowly cooled tellurium-rich sample.

首次合成了Co7(Se1-yTey)8在整个浓度范围（0≤y≤1）下的多晶样品，并通过x射线衍射、扫描电镜、热膨胀、比热容和电阻率测量对样品进行了研究。根据碲的浓度不同，分别采用固相反应法（y < 0.9）和熔融法（y≥0.9）获得单相样品。当硒被碲取代时，晶体结构发生了变化（P3121→P-3m1→P63/mmc→P-3m1），由于空位的无序性，热原子位移具有显著的各向异性，晶格扩展具有各向异性。根据比热测量，碲浓度的增加伴随着电子比热系数的降低，这表明体系的金属丰度增加，并得到电阻率数据的证实。在取代化合物中，使用热膨胀和温度相关的x射线衍射，在加热时检测到样品的spinodal分解。用扫描电镜观察慢冷富碲试样表面的第二相为枝晶。

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引用次数: 0

Capping stabilization mechanism of vanadate-stabilized δ-Bi2O3: Experimental and theoretical approaches 钒酸稳定δ-Bi2O3的旋盖稳定机理：实验与理论探讨

IF 10.5 2区化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR

Progress in Solid State Chemistry

Pub Date : 2025-12-01 Epub Date: 2025-10-18 DOI: 10.1016/j.progsolidstchem.2025.100549

Zhe-Hao Lin , Yu-Chun Wu

引用次数: 0