Characterisation of thermal properties of Cs.sub.2./sub.HfCl.sub.6./sub. crystal by DSC-TG and TMA analyses

0522021 - FZÚ 2020 HU eng A - Abstrakt
Zemenová, Petra - Král, Robert - Vaněček, Vojtěch - Veverka, Pavel - Kodama, S. - Kurosawa, S. - Yokota, Y. - Yoshikawa, A. - Nikl, Martin
Characterisation of thermal properties of Cs₂HfCl₆ crystal by DSC-TG and TMA analyses.
Book of Abstracts JTACC + V4 (2019). Budapešť: Akadémiai Kiadó / AKCongress, 2019. s. 584-584.
[Journal of Thermal Analysis and Calorimetry Conference /2./. 18.06.2019-21.06.2019, Budapest]
Grant CEP: GA ČR GJ18-17555Y
Institucionální podpora: RVO:68378271
Klíčová slova: Cs₂HfCl₆ crystal * DSC-TG * TMA
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)

The Cs2HfCl6 single crystal was grown from a stoichiometric mixture of CsCl and HfCl4 (2:1) by unseeded vertical Bridgman method in sealed quartz ampoule. The chemical composition of prepared Cs2HfCl6 crystals was analyzed using XRF. The XRD showed that the content of the Cs2HfCl6 phase changed along the ingot: 97 mol% at the start and 22 mol% at the end. The only secondary phase observed in both samples was CsCl. Samples from both parts of the crystal ingot were measured by the non-isothermal DSC-TG analysis under inert nitrogen atmosphere. The DSC curves of both samples contained effects corresponding to the phase transition of the CsCl from alpha (Pm-3m) to beta phase (Fm-3m). The eutectic melting temperature of Cs2HfCl6 and CsCl phases was detected. Multiple effects observed above eutectic temperature up to 900 °C were ascribed to series of decomposition reactions of the molten solution of CsCl and Cs2HfCl6 under release of gaseous HfCl4.

Trvalý link: http://hdl.handle.net/11104/0306548