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Article

Pressure–Temperature Phase Diagram of Ta-H System up to 9 GPa and 600 °C

1
Quantum Beam Science Research Directorate, National Institutes for Quantum and Radiological Science and Technology, Hyogo 679-5148, Japan
2
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
3
Department of Engineering Science and Mechanics, Shibaura Institute of Technology, Tokyo 135-8548, Japan
4
Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai 980-8577, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Andrea Atrei
Appl. Sci. 2021, 11(15), 6719; https://doi.org/10.3390/app11156719
Received: 7 July 2021 / Revised: 19 July 2021 / Accepted: 21 July 2021 / Published: 22 July 2021
(This article belongs to the Special Issue New Vistas in Metal Hydrides and Related Materials)
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. View Full-Text
Keywords: synchrotron radiation X-rays; high pressure and high temperature; tantalum; phase diagram; Ta–H; tantalum hydride; tantalum dihydride synchrotron radiation X-rays; high pressure and high temperature; tantalum; phase diagram; Ta–H; tantalum hydride; tantalum dihydride
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MDPI and ACS Style

Saitoh, H.; Takagi, S.; Sato, T.; Orimo, S.-i. Pressure–Temperature Phase Diagram of Ta-H System up to 9 GPa and 600 °C. Appl. Sci. 2021, 11, 6719. https://doi.org/10.3390/app11156719

AMA Style

Saitoh H, Takagi S, Sato T, Orimo S-i. Pressure–Temperature Phase Diagram of Ta-H System up to 9 GPa and 600 °C. Applied Sciences. 2021; 11(15):6719. https://doi.org/10.3390/app11156719

Chicago/Turabian Style

Saitoh, Hiroyuki, Shigeyuki Takagi, Toyoto Sato, and Shin-ichi Orimo. 2021. "Pressure–Temperature Phase Diagram of Ta-H System up to 9 GPa and 600 °C" Applied Sciences 11, no. 15: 6719. https://doi.org/10.3390/app11156719

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