title: Magnetic properties of solid solutions between BiCrO3and BiGaO3with perovskite structures.
abstract: Magnetic properties of BiCr1-xGaxO3perovskite-type solid solutions are reported, and a magnetic phase diagram is established. As-synthesized BiCrO3and BiCr0.9Ga0.1O3crystallize in a monoclinic (m) C2/c structure. The Néel temperature (TN) decreases from 111 K in BiCrO3to 98 K in BiCr0.9Ga0.1O3, and spin-reorientation transition temperature increases from 72 K in BiCrO3to 83 K in BiCr0.9Ga0.1O3.o-BiCr0.9Ga0.1O3with a PbZrO3-type orthorhombic structure is obtained by heatingm-BiCr0.9Ga0.1O3up to 573 K in air; it shows similar magnetic properties with those ofm-BiCr0.9Ga0.1O3.TNof BiCr0.8Ga0.2O3is 81 K, andTNof BiCr0.7Ga0.3O3is 63 K. Samples withx= 0.4, 0.5, 0.6 and 0.7 crystallize in a polar R3c structure. Long-range antiferromagnetic order with weak ferromagnetism is observed belowTN= 56 K in BiCr0.6Ga0.4O3,TN= 36 K in BiCr0.5Ga0.5O3andTN= 18 K in BiCr0.4Ga0.6O3. BiCr0.3Ga0.7O3shows a paramagnetic behaviour because the Cr concentration is below the percolation threshold of 31%.
authors.affiliation: International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.
authors.forename: Alexei A
authors.initials: AA
authors.lastname: Belik
keywords: BiCrO3; high-pressure; magnetic properties; multiferroics; perovskites