The δ ′/δ phase transition in hafnium hydride and deuteride

Ken Kurosaki; Daichi Araki; Yuji Ohishi; Hiroaki Muta; Kenji Konashi; Shinsuke Yamanaka

doi:10.1080/00223131.2014.962638

The δ ′/δ phase transition in hafnium hydride and deuteride

Ken Kurosaki, Daichi Araki, Yuji Ohishi, Hiroaki Muta, Kenji Konashi, Shinsuke Yamanaka

IMR - International Research Center for Nuclear Materials Science

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

Bulk samples of hafnium (Hf) hydride and deuteride were prepared and the thermal properties, heat capacity (C_P) and thermal conductivity (κ) were measured. In the C_P-temperature curves for both samples, typical lambda-type peaks were observed at around 350 K, which was due to the second-order phase transition from the δ′-phase to the δ-phase. In Hf hydride, it is considered that the δ′-phase and the δ-phase consist of regularly arranged and randomly arranged hydrogen atoms, respectively. Therefore, it can be said that the δ′/δ phase transition observed in both Hf hydride and deuteride is an order-disorder phase transition. The values of κ as well as C_P changed significantly at around the phase transition temperature.

Original language	English
Pages (from-to)	541-545
Number of pages	5
Journal	Journal of Nuclear Science and Technology
Volume	52
Issue number	4
DOIs	https://doi.org/10.1080/00223131.2014.962638
Publication status	Published - 2015 Apr 3

Keywords

fast reactor
hafnium deuteride
hafnium hydride
heat capacity
neutron control material
phase transition
thermal conductivity

Access to Document

10.1080/00223131.2014.962638

Cite this

@article{48c153735f2d4e5ab276fd4db18e9437,

title = "The δ ′/δ phase transition in hafnium hydride and deuteride",

abstract = "Bulk samples of hafnium (Hf) hydride and deuteride were prepared and the thermal properties, heat capacity (CP) and thermal conductivity (κ) were measured. In the CP-temperature curves for both samples, typical lambda-type peaks were observed at around 350 K, which was due to the second-order phase transition from the δ′-phase to the δ-phase. In Hf hydride, it is considered that the δ′-phase and the δ-phase consist of regularly arranged and randomly arranged hydrogen atoms, respectively. Therefore, it can be said that the δ′/δ phase transition observed in both Hf hydride and deuteride is an order-disorder phase transition. The values of κ as well as CP changed significantly at around the phase transition temperature.",

keywords = "fast reactor, hafnium deuteride, hafnium hydride, heat capacity, neutron control material, phase transition, thermal conductivity",

author = "Ken Kurosaki and Daichi Araki and Yuji Ohishi and Hiroaki Muta and Kenji Konashi and Shinsuke Yamanaka",

year = "2015",

month = apr,

day = "3",

doi = "10.1080/00223131.2014.962638",

language = "English",

volume = "52",

pages = "541--545",

journal = "Journal of Nuclear Science and Technology",

issn = "0022-3131",

publisher = "Taylor and Francis Ltd.",

number = "4",

}

TY - JOUR

T1 - The δ ′/δ phase transition in hafnium hydride and deuteride

AU - Kurosaki, Ken

AU - Araki, Daichi

AU - Ohishi, Yuji

AU - Muta, Hiroaki

AU - Konashi, Kenji

AU - Yamanaka, Shinsuke

PY - 2015/4/3

Y1 - 2015/4/3

N2 - Bulk samples of hafnium (Hf) hydride and deuteride were prepared and the thermal properties, heat capacity (CP) and thermal conductivity (κ) were measured. In the CP-temperature curves for both samples, typical lambda-type peaks were observed at around 350 K, which was due to the second-order phase transition from the δ′-phase to the δ-phase. In Hf hydride, it is considered that the δ′-phase and the δ-phase consist of regularly arranged and randomly arranged hydrogen atoms, respectively. Therefore, it can be said that the δ′/δ phase transition observed in both Hf hydride and deuteride is an order-disorder phase transition. The values of κ as well as CP changed significantly at around the phase transition temperature.

AB - Bulk samples of hafnium (Hf) hydride and deuteride were prepared and the thermal properties, heat capacity (CP) and thermal conductivity (κ) were measured. In the CP-temperature curves for both samples, typical lambda-type peaks were observed at around 350 K, which was due to the second-order phase transition from the δ′-phase to the δ-phase. In Hf hydride, it is considered that the δ′-phase and the δ-phase consist of regularly arranged and randomly arranged hydrogen atoms, respectively. Therefore, it can be said that the δ′/δ phase transition observed in both Hf hydride and deuteride is an order-disorder phase transition. The values of κ as well as CP changed significantly at around the phase transition temperature.

KW - fast reactor

KW - hafnium deuteride

KW - hafnium hydride

KW - heat capacity

KW - neutron control material

KW - phase transition

KW - thermal conductivity

UR - http://www.scopus.com/inward/record.url?scp=84924405893&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84924405893&partnerID=8YFLogxK

U2 - 10.1080/00223131.2014.962638

DO - 10.1080/00223131.2014.962638

M3 - Article

AN - SCOPUS:84924405893

SN - 0022-3131

VL - 52

SP - 541

EP - 545

JO - Journal of Nuclear Science and Technology

JF - Journal of Nuclear Science and Technology

IS - 4

ER -

The δ ′/δ phase transition in hafnium hydride and deuteride

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this