Nature of low-temperature phase transitions in CaMn7O12статья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:New data on the specific heat, thermal expansion, and magnetization of the CaMn7O12 phase require a revision of the current concepts of the sequence of phase transitions in this compound. It is found that a spin-glass phase transition occurs in CaMn7O12 at T-M = 49 K, whereas the transition at T-S = 89 K exhibits the features of a first-order phase transition and thereby is apparently of structural origin. In the range T-M < T < T-S, the CaMn7O12 compound exhibits negative thermal expansion, which is also indicative of structural changes. (C) 2005 Pleiades Publishing, Inc.