La1-xCaxMnO3 (0.5 ≤ x ≤ 0.8)纳米颗粒的磁性质研究，刘莉，袁松柳，Magnetic properties of La1-xCaxMnO3 (0.5 ≤ x ≤ 0.8) samples with the same average particle size ~ 50 nm prepared by a sol-gel method are investigated. The charge ordering (CO)