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Valence of Ti cations and its effect on magnetic properties of spinel ferrites TixM1?xFe2O4 (M = Co, Mn)

机译:钛阳离子的价态及其对尖晶石铁氧体Ti x M 1? x Fe 2 O 4 (M = Co,Mn)

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Powder samples of TixCo1?xFe2O4 (0.0 ≤ x ≤ 0.4) and TixMn1?xFe2O4 (0.0 ≤ x ≤ 0.3) were synthesized using a conventional method for preparing ceramics. X-ray diffraction analysis confirmed that the samples consisted of a single phase with a cubic (A)[B]2O4 spinel structure. The average molecular magnetic moment (μexp) measured at 10 K decreased monotonically with increasing x for two series of samples. According to previous investigations, Ti2+ and Ti3+ cations are present in these ferrites, but there are no Ti4+ cations; the magnetic moments of the Ti2+, Ti3+, and Mn3+ cations are assumed to couple antiferromagnetically with those of the Mn2+, Co2+, Co3+, Fe2+, and Fe3+ cations whenever they are at the (A) or [B] sublattice. The dependence of μexp of the two series of samples on the doping level x was fitted using a quantum-mechanical potential barrier, and the cation distributions in the two series of samples were obtained.
机译:Ti x Co 1? x 的粉末样品> Fe 2 O 4 (0.0≤ x ≤0.4)和Ti < small> x Mn 1? x Fe 使用常规制备方法合成 2 O 4 (0.0≤ x ≤0.3)陶瓷。 X射线衍射分析证实样品由单相组成,立方(A)[B] 2 O 4 尖晶石结构。在10 K下测得的两个系列的平均分子磁矩(μ exp )随着 x 的增加单调降低样品。根据以前的研究,这些铁氧体中存在Ti 2 + 和Ti 3 + 阳离子,但其中有没有Ti 4 + 阳离子; Ti 2 + ,Ti 3 + 和Mn 3的磁矩假定+ 阳离子与Mn 2 + ,Co 2 + 的阳离子反铁磁耦合,Co 3 + ,Fe 2 + 和Fe 3 + 阳离子在(A)或[B]子晶格上。使用量子阱拟合两个样品的μ exp 对掺杂水平 x 的依赖性。获得机械势垒,并获得两个系列样品中的阳离子分布。

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