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

Abstract

The new compounds Yb2MI 3Fe5O12 (MI — 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 -shaped jumps on the dependence diagrams CP 0 ~ f (T) which caused, probably by phase transitions of the second type.