研究報告21 - 1 論文 - Original
Zr2M (M=Co, Ni) 系合金の水素誘起不均化生成物の
結晶子への温度及び水素圧力の影響
Change in Grain Size of Disproportionation Products of Zr2M
(M=Co,Ni) with Temperature and Pressure
原 正憲、渡辺国昭
常田貴志*、川畑常真*、松田健二*、池野進*
富山大学水素同位体科学研究センター
*富山大学工学部
〒930-8555 富山市五福3190
Masanori HARA, Kuniaki WATANABE
Takashi TSUNEDA*, Tokimasa KAWABATA*, Kenji MATSUDA*,
Susumu IKENO*
Hydrogen Isotope Research Center,
*Mater. Sci. and Eng., Faculty of Eng.,
Toyama University, Gofuku 3190, Toyama 930-8555, Japan
Abstract
Zr2Co disproportionated to ZrH2 and ZrCo
on a wide range of temperatures and pressures. The X-ray diffraction patterns
of disproportionated Zr2Co were constructed broad peaks that
meant to consist of fine crystallite. To evaluate the temperature and pressure
dependence of nucleation of products, the grain size of ZrH2
was calculated on a half width of ZrH2 111 peak by using Sherrer
equation. It was found that the grain size did not depend on disproportionation
conditions such as temperature and pressure. Zr2Ni also disproportionated
and the grain size was not affected by temperature and pressure. These
results indicate that the probability of nucleation does not depend on
temperature and pressure. The disproportionation rates of Zr2M
are determined mainly by the crystal growth rate of products. However,
Zr2NiH5 was formed under the condition of low pressure.
The appearance of disproportionation was affected by amount of absorbed
hydrogen.