Uniaxial anisotropy caused by Pr4+in Y2.5Pr0.5-xCaxFe5O12

Induced uniaxial anisotropy values have been measured by using a torque balance in polycrystalline garnet samples of the general formula Y
2.5
Pr
0.5-x
Ca
x
Fe
5
O
12
with x = 0, 0.01, 0.05, 0.075, 0.1, 0.15. We find, that a uniaxial anisotropy can be induced in two temperature range which is due to a electron migration between Pr
³⁺
and Pr
⁴⁺
ions on dodecahedral sites.