Crystal phase stability and barocaloric efficiency of (NH4)3WO2F5

IF 3.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR Solid State Sciences Pub Date : 2024-09-17 DOI:10.1016/j.solidstatesciences.2024.107703

Evgeniy V. Bogdanov , Mikhail V. Gorev , Natalia M. Laptash , Andrey V. Kartashev , Evgeniy I. Pogoreltsev , Igor N. Flerov

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Abstract

Calorimetric, dilatometric and pressure studies of (NH₄)₃WO₂F₅ were performed over a wide temperature range, including the Pm-3m ↔ Pa-3 phase transition. Comparison of the obtained results with data for related fluorides (NH₄)₃SnF₇ and (NH₄)₃TiF₇ undergoing the same structural changes showed a significant role of chemical pressure in the formation of thermal and barocaloric properties. A decrease in anomalous entropy in oxyfluoride, ΔS₀ = 12.2 J/mol·K, is accompanied by a significant increase in sensitivity to hydrostatic pressure, dT₀/dp = 93 K/GPa, the preservation of a large change in anomalous deformation δ(ΔV/V)₀ = 0.45 % and a small temperature hysteresis, δT₀ < 1 K. This combination of thermal characteristics has led to both a significant increase in extensive and intensive barocaloric parameters in the low pressures area, and to their high reversibility in the modes of increasing and decreasing pressure.

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(NH4)3WO2F5 的晶相稳定性和巴焦效率

对(NH4)3WO2F5进行了宽温度范围的量热、稀释和压力研究，包括Pm-3m ↔ Pa-3相变。将获得的结果与相关氟化物 (NH4)3SnF7 和 (NH4)3TiF7 发生相同结构变化的数据进行比较后发现，化学压力在形成热和巴热特性方面起着重要作用。氟化氧的反常熵降低（ΔS0 = 12.2 J/mol-K）的同时，对静水压力的敏感性显著增加（dT0/dp = 93 K/GPa），反常变形的巨大变化δ(ΔV/V)0 = 0.这种热特性的组合使得低压区域的广泛和密集巴氏参数显著增加，并且在压力增加和减少的模式下具有很高的可逆性。

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来源期刊

Solid State Sciences 化学-无机化学与核化学

CiteScore

6.60

自引率

2.90%

发文量

214

审稿时长

27 days

期刊介绍： Solid State Sciences is the journal for researchers from the broad solid state chemistry and physics community. It publishes key articles on all aspects of solid state synthesis, structure-property relationships, theory and functionalities, in relation with experiments. Key topics for stand-alone papers and special issues: -Novel ways of synthesis, inorganic functional materials, including porous and glassy materials, hybrid organic-inorganic compounds and nanomaterials -Physical properties, emphasizing but not limited to the electrical, magnetical and optical features -Materials related to information technology and energy and environmental sciences. The journal publishes feature articles from experts in the field upon invitation. Solid State Sciences - your gateway to energy-related materials.