Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 22, Issue 18, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/22/18/185901
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Funding
- RFBR [09-02-98001]
- President of the Russian Federation [Nsh-1011.2008.2]
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The thermal expansion along the a, b and c axes of a (NH4)(2)NbOF5 crystal was measured from 120 to 300 K. Anomalies of alpha(T) associated with previously reported phase transitions Cmc2(1) -> C-2 -> I a were observed along all directions at T-1 = 259.3 K and T-2 = 220.5 K. The analysis of thermal expansion and heat capacity in the frame of the Pippard relations has permitted us to determine the uniaxial pressure derivatives of the transition temperatures dT/d sigma(i). The T-sigma(i) phase diagrams have shown a tendency for the intermediate phase to disappear at high stress along the b and c axes. Intensive and extensive barocaloric effects near the structural phase transitions were found to be comparable with the caloric parameters of some ferroelectrics, ferromagnets and antiferromagnets.
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