Specific features in thermal expansion of RFe11Ti single crystalsстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Thermal expansion and its anomalies in the vicinity of spin-reorientation phase transitions in single crystals of RFe11Ti (R = Y, Tb, Dy, Ho, and Er) compounds are investigated by the tensometric technique in the temperature range 77-400 K. The temperature dependences of the thermal expansion coefficient alpha (T) are obtained. It is found that the YFe11Ti and HoFe11Ti uniaxial magnetic materials exhibit pronounced anomalies in the alpha coefficient at T = 200 and 290 K. For the TbFe11Ti single crystal, the alpha coefficient is close to zero in the vicinity of the spin-reorientation phase transition (at T = 325 K). For the DyFe11Ti single crystal, which is characterized by two spin-reorientation phase transitions (at T = 120 and 250 K), no features in the alpha (T) dependence are revealed in the region of the low-temperature spin-reorientation phase transition. In the ErFe11Ti single crystal, the specific feature of thermal expansion is observed at T similar to 220 K. (C) 2001 MAIK “Nauka/Interperiodica”.