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Keywords = tantalum dihydride

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8 pages, 1615 KiB  
Article
Pressure–Temperature Phase Diagram of Ta-H System up to 9 GPa and 600 °C
by Hiroyuki Saitoh, Shigeyuki Takagi, Toyoto Sato and Shin-ichi Orimo
Appl. Sci. 2021, 11(15), 6719; https://doi.org/10.3390/app11156719 - 22 Jul 2021
Cited by 3 | Viewed by 2398
Abstract
High-pressure hydrogenation behaviors of pure metals have not been investigated extensively, although intense research of hydrogenation reactions under high pressure has been conducted to find novel functional hydrides. The former provides us with valuable information for the high-pressure synthesis of novel functional hydrides. [...] Read more.
High-pressure hydrogenation behaviors of pure metals have not been investigated extensively, although intense research of hydrogenation reactions under high pressure has been conducted to find novel functional hydrides. The former provides us with valuable information for the high-pressure synthesis of novel functional hydrides. A pressure–temperature phase diagram of the Ta–H system has been determined using the in situ synchrotron radiation X-ray diffraction technique below 9 GPa and 600 °C in this study. At room temperature, the phase boundary obtained between distorted bcc TaH~1 and hcp TaH~2 was consistent with the previously reported transition pressure. The experimentally obtained Clapeyron slope can be explained via the entropy change caused by hydrogen evolution from TaH~2. Full article
(This article belongs to the Special Issue New Vistas in Metal Hydrides and Related Materials)
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