Synthesis, X-ray and thermodynamic studies of compounds Yb2MI 3Fe5O12 (M-I - Li, Na, K)

Ye. S. Mustafin, H. B. Omarov,D. Havlicek, R. Z. Kassenov, D. A. Kaykenov,A. A. Muratbekova, D. K. Tuletaev, I. A. Kancher

BULLETIN OF THE UNIVERSITY OF KARAGANDA-CHEMISTRY（2015）

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摘要

The new compounds Yb2MI 3Fe5O12 (M-I - Li, Na, K) have been synthesized by solid phase method from oxides of lithium, sodium, potassium, iron and lanthanum. By means of XRD analysis it was determined that the compounds crystallize in a tetragonal crystal system. The compounds' heat capacities have been measured in the range of temperature 298.15... 673 K and have been found lambda- shaped jumps on the dependence diagrams C-P(o)similar to f (T) which caused, probably by phase transitions of the second type.

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关键词

solid-phase synthesis,ferrites,crystal lattice parameters of the crystal lattice,the temperature dependence of the specific heat,the temperature dependence of the thermodynamic functions,phase transformations.

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