Тип публикации: статья из журнала

Год издания: 2024

Идентификатор DOI: 10.1016/j.solidstatesciences.2024.107703

Ключевые слова: oxyfluorides, phase transition, entropy, thermal expansion, pressure, Barocaloric effect

Аннотация: 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 Показать полностьюin 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.

Журнал: Solid State Sciences

Выпуск журнала: Т.157

Номера страниц: 107703

ISSN журнала: 12932558

Издатель: Elsevier Science Publishing Company, Inc.

• Bogdanov Evgeniy V. (Institute of Engineering Physics and Radioelectronics, Siberian Federal University)
• Gorev Mikhail V. (Institute of Engineering Physics and Radioelectronics, Siberian Federal University)
• Laptash Natalia M. (Institute of Chemistry, Far Eastern Department of RAS)
• Kartashev Andrey V. (Krasnoyarsk State Medical University)
• Pogoreltsev Evgeniy I. (Krasnoyarsk State Medical University)
• Flerov Igor N. (Kirensky Institute of Physics, Federal Research Center KSC SB RAS)

• Ядро РИНЦ (eLIBRARY.RU)