X-Ray diffraction study on the hydrogen–hafnium system at high temperatures

Autor:	Tomoyasu Hashino, Sizuo Naito, Masao Kimura, Mahito Mabuchi
Rok vydání:	1992
Předmět:	Diffraction Crystallography chemistry Hydrogen Interstitial defect Phase (matter) X-ray crystallography Analytical chemistry chemistry.chemical_element Physical and Theoretical Chemistry Isothermal process Hafnium Phase diagram
Zdroj:	J. Chem. Soc., Faraday Trans.. 88:2221-2226
ISSN:	1364-5455 0956-5000
DOI:	10.1039/ft9928802221
Popis:	The lattice structure of the host metal in the hydrogen–hafnium system, whose isothermal pressure–composition curves display an anomalistic pattern among the systems for titanium-group metals, has been investigated by means of X-ray diffraction. An advanced apparatus for in situ measurement of X-ray diffraction at high temperatures (ca. 1100 K) in hydrogen gas has been developed. In the phase diagram, the phase boundaries of the two-phase α+δ region do not correspond to the horizontal part of the isothermal curve: the two-phase α+δ region extends in the domain where the isothermal curves are sloped. The structure of hafnium is scarcely affected by the absorbtion of hydrogen and remains crystalline even in the sloped-plateau region. These results suggest a variation of energy for interstitial sites, which is consistent with results obtained in some theoretical approaches.
Databáze:	OpenAIRE
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