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Ferroelectrics Volume 501, 2016 - Issue 1: Proceedings of the Eighth International Seminar on Ferroelastic Physics ISFP-8 (13)
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Original Articles

Thermal properties of (NH4)2MeF6·NH4F (Me: Ti, Sn) crystals undergoing transformation between two cubic phases

E. I. PogoreltsevKirensky Institute of Physics, Siberian Department of RAS,660036Krasnoyarsk, Russia;Institute of Engineering Physics and Radioelectronic, Siberian State University, Krasnoyarsk, RussiaCorrespondence[email protected]
,
E. V. BogdanovKirensky Institute of Physics, Siberian Department of RAS,660036Krasnoyarsk, Russia;Krasnoyarsk State Agrarian University, Krasnoyarsk, Russia
,
A. V. KartashevKirensky Institute of Physics, Siberian Department of RAS,660036Krasnoyarsk, Russia
,
M. S. MolokeevKirensky Institute of Physics, Siberian Department of RAS,660036Krasnoyarsk, Russia;Far Eastern State Transport University, Khabarovsk, Russia
,
I. N. FlerovKirensky Institute of Physics, Siberian Department of RAS,660036Krasnoyarsk, Russia;Institute of Engineering Physics and Radioelectronic, Siberian State University, Krasnoyarsk, Russia
&
N. M. LaptashInstitute of Chemistry, Far Eastern Department of RAS, Vladivostok, Russia
Pages 20-25 | Received 13 Sep 2015, Accepted 23 Jan 2016, Published online: 17 Oct 2016
 
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ABSTRACT

The heat capacity, thermal expansion, and T-p phase diagrams of (NH4)3TiF7 and (NH4)3SnF7 were studied in wide temperature and pressure ranges. The total excess entropies at successive Pa-3 ↔ P4/mnc ↔ 4/m (Ti) and single Pa-3 ↔ Pm-3m (Sn) phase transitions are close to each other and characteristic for the order–disorder processes. The Pm-3m cubic phase and direct Pa-3 ↔ Pm-3m transformation were found at high pressure in (NH4)3TiF7. The different sign of baric coefficients for phase transition between two cubic phases in (NH4)3TiF7 and (NH4)3SnF7 was supposed due to nonlinear phase boundary with pressure in the latter fluoride.

Acknowledgment

The reported study was partially supported by RFBR, research project No 15-02-02009-a.

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