Тип публикации: статья из журнала
Год издания: 1991
Идентификатор DOI: 10.1088/0953-8984/3/25/003
Аннотация: The model and methods developed earlier for describing the statistical properties of hydrogen in the NbH(x)-type systems are used to investigate the transition between the phases alpha, alpha', beta, delta and epsilon in TaH(x). The main features of the observed phase diagram (x, T) can be naturally explained if one assumes that thПоказать полностьюe concentration dependence of the hydrogen partial enthalpy h(H)(x) in TaH(x) has an anomaly near x(c) congruent-to 0.5 similar to that established earlier for NbH(x). Then, treating values of the mean-field constaints in the ordered phases as parameters of the model we can fairly well describe all the main features of the complex phase diagram of TaH(x) in the whole (x, T) range considered. We also discuss the structure of the ordered phases and the temperature dependences of the order parameters. An anomalous softening for some critical concentration waves is predicted which can be observed in neutron or x-ray diffraction experiments for the disordered alpha-phase.
Журнал: JOURNAL OF PHYSICS-CONDENSED MATTER
Выпуск журнала: Vol. 3, Is. 25
Номера страниц: 4533-4545
ISSN журнала: 09538984
Место издания: BRISTOL
Издатель: IOP PUBLISHING LTD