Incompatible magnetic and dielectric properties of BiCu3-xMnxTi4-yMyO12 (x = 0 & 0.5; y = 1 & 1.5 and M = Fe & Mn)

A remarkable high entropy effect on the magnetic behaviour of quadruple perovskites

“…56 Bi 2 Ti 2 O 7 and CuO impurities are found in both BiCu 2.5 Mn 0.5 Ti 2.5 Fe 1.5 O 12 and BiCu 3 Ti 3 MnO 12 . 57 The phase contents in ambient pressure synthesized LaCu 3 Mn 3 TiO 12 and LaCu 3 Mn 3.5 Ti 0.5 O 12 are ∼85% and ∼80%, respectively. 48 The Gd 0.75 Ce 0.25 Cu 3 Ti 1.3 Mn 2.7 O 12 phase was reported to exhibit T C near room temperature containing only 85% of the desired quadruple perovskites and 15% of CuO and GdMn 2 O 5 impurities.…”

“…48 The presence of impurity phases in conventional quadruple perovskites even when synthesized under high pressure is reported by several authors. 46,[48][49][50][51][52][53][54][55][56][57] About 9% Mn 2 O 3 , Mn 3 O 4 and CaMn 2 O 4 are reported in CaMn 7 O 12 . 49 The phase purity of BiCu 3 Mn 4 O 12 synthesized under a pressure of 6 GPa is only B87% along with Bi 2 (CO 3 )O 2 and CuO impurities.…”