Abstract Powder samples of La0.95T0.05CrxMn1−xO3 (T = Ca or Sr, 0.00 ≤ x ≤ 0.30), two series of ABO3 perovskite manganites, were synthesized using the sol–gel method. X-ray diffraction analysis showed that all the samples had a single ABO3 perovskite phase with space group R 3 ‾ c . Unique magnetic properties were obtained for the oxides: (i) the Curie temperature of each series of samples first increased and then decreased with increasing Cr content (x); (ii) the average molecular magnetic moment reached the maximum value when x = 0.08 for the Ca-doped samples, but it monotonically decreased with increasing x for the Sr-doped samples. This behavior was explained using an O 2p itinerant-electron model for magnetic oxides.

中文翻译：

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钙钛矿锰酸盐的独特磁性 La 0.95 T 0.05 Cr x Mn 1− x O 3 (T = Ca, Sr)

摘要 La0.95T0.05CrxMn1−xO3 (T = Ca 或 Sr, 0.00 ≤ x ≤ 0.30) 粉末样品是两个系列的 ABO3 钙钛矿锰酸盐，采用溶胶-凝胶法合成。X 射线衍射分析表明，所有样品都具有单一的 ABO3 钙钛矿相，空间群为 R 3 ‾ c 。氧化物获得了独特的磁性能：(i) 各系列样品的居里温度随着 Cr 含量 (x) 的增加先升高后降低；(ii) 对于 Ca 掺杂的样品，当 x = 0.08 时，平均分子磁矩达到最大值，但对于 Sr 掺杂的样品，它随着 x 的增加而单调下降。使用磁性氧化物的 O 2p 流动电子模型解释了这种行为。