Phase states in the Y1 − x Ca x MnO3 solid solution system

Abstract

The room-temperature stability region of the tetragonal phase in the Y1 − xCaxMnO3 solid solution system has been found for the first time. The concentration boundaries between this phase and the orthorhombic (x > 0.5) and hexagonal (x < 0.25) phases are sensitive to the sample preparation conditions. The coexistence of the hexagonal and tetragonal phases in the range 0.15 < x < 0.25 indicates that these phases undergo a first-order reconstructive phase transition. Preliminary measurements of magnetic ordering effects for compositions with x = 0.3, 0.5, and 0.7 have been performed.