Thermophysical properties and reversible phase transitions in yttrium hydride

Artem A. Trofimov; Xunxiang Hu; Hsin Wang; Ying Yang; Kurt A. Terrani

doi:10.1016/j.jnucmat.2020.152569

Thermophysical properties and reversible phase transitions in yttrium hydride

Artem A. Trofimov, Xunxiang Hu, Hsin Wang, Ying Yang, Kurt A. Terrani

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13 Scopus citations

Abstract

The thermophysical properties of yttrium hydrides were investigated as a function of temperature (room temperature [RT] to 700°C) and hydrogen concentration (H/Y ratio ranges from 1.52 to 1.93). The results indicate that at the temperatures below 300°C, the hydrogen content did not have a significant influence on the thermal expansion, while the specific heat capacity, the thermal diffusivity, and the calculated thermal conductivity were slightly higher for the larger H/Y ratio. Between 300°C and 700°C, a reversible second-order endothermic transition in all measured thermal properties was observed. It was also found that the onset temperatures of the observed transition varied, with the composition having inverse dependence on the hydrogen content. The phase transition from (α-Y + δ-YH_x) mixed phase to the δ-YH_x single phase was excluded from the main contributors to the observed transition. An attempt was made to explain the behavior of the thermophysical properties at higher temperatures by considering the order–disorder transition as a result of hydrogen redistribution.

Original language	English
Article number	152569
Journal	Journal of Nuclear Materials
Volume	542
DOIs	https://doi.org/10.1016/j.jnucmat.2020.152569
State	Published - Dec 15 2020

Funding

Notice: This manuscript has been authored by UT-Battelle, LLC, under Contract No. DE-AC0500OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for the United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ). This research was sponsored by the Transformational Challenge Reactor Program of the US Department of Energy Office of Nuclear Energy. Drs. Raphael Hermann, James Torres, and Ercan Cakmak at ORNL performed thorough reviews of the manuscript.

Keywords

Heat capacity
Phase transformation
Thermal conductivity
Thermal diffusivity
Thermal expansion
Yttrium hydride

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10.1016/j.jnucmat.2020.152569

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title = "Thermophysical properties and reversible phase transitions in yttrium hydride",

abstract = "The thermophysical properties of yttrium hydrides were investigated as a function of temperature (room temperature [RT] to 700°C) and hydrogen concentration (H/Y ratio ranges from 1.52 to 1.93). The results indicate that at the temperatures below 300°C, the hydrogen content did not have a significant influence on the thermal expansion, while the specific heat capacity, the thermal diffusivity, and the calculated thermal conductivity were slightly higher for the larger H/Y ratio. Between 300°C and 700°C, a reversible second-order endothermic transition in all measured thermal properties was observed. It was also found that the onset temperatures of the observed transition varied, with the composition having inverse dependence on the hydrogen content. The phase transition from (α-Y + δ-YHx) mixed phase to the δ-YHx single phase was excluded from the main contributors to the observed transition. An attempt was made to explain the behavior of the thermophysical properties at higher temperatures by considering the order–disorder transition as a result of hydrogen redistribution.",

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AU - Trofimov, Artem A.

AU - Hu, Xunxiang

AU - Wang, Hsin

AU - Yang, Ying

AU - Terrani, Kurt A.

PY - 2020/12/15

Y1 - 2020/12/15

N2 - The thermophysical properties of yttrium hydrides were investigated as a function of temperature (room temperature [RT] to 700°C) and hydrogen concentration (H/Y ratio ranges from 1.52 to 1.93). The results indicate that at the temperatures below 300°C, the hydrogen content did not have a significant influence on the thermal expansion, while the specific heat capacity, the thermal diffusivity, and the calculated thermal conductivity were slightly higher for the larger H/Y ratio. Between 300°C and 700°C, a reversible second-order endothermic transition in all measured thermal properties was observed. It was also found that the onset temperatures of the observed transition varied, with the composition having inverse dependence on the hydrogen content. The phase transition from (α-Y + δ-YHx) mixed phase to the δ-YHx single phase was excluded from the main contributors to the observed transition. An attempt was made to explain the behavior of the thermophysical properties at higher temperatures by considering the order–disorder transition as a result of hydrogen redistribution.

AB - The thermophysical properties of yttrium hydrides were investigated as a function of temperature (room temperature [RT] to 700°C) and hydrogen concentration (H/Y ratio ranges from 1.52 to 1.93). The results indicate that at the temperatures below 300°C, the hydrogen content did not have a significant influence on the thermal expansion, while the specific heat capacity, the thermal diffusivity, and the calculated thermal conductivity were slightly higher for the larger H/Y ratio. Between 300°C and 700°C, a reversible second-order endothermic transition in all measured thermal properties was observed. It was also found that the onset temperatures of the observed transition varied, with the composition having inverse dependence on the hydrogen content. The phase transition from (α-Y + δ-YHx) mixed phase to the δ-YHx single phase was excluded from the main contributors to the observed transition. An attempt was made to explain the behavior of the thermophysical properties at higher temperatures by considering the order–disorder transition as a result of hydrogen redistribution.

KW - Heat capacity

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KW - Thermal conductivity

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Thermophysical properties and reversible phase transitions in yttrium hydride

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