Structural, magnetic and electrical properties of La0.67Pb0.33Mn1-xCoxO3 (0 ≤ x ≤ 0.3)

被引：40

作者：

Dhahri, N. ^{[1
]}

Dhahri, A. ^{[1
]}

Cherif, K. ^{[1
]}

Dhahri, J. ^{[1
]}

Taibi, K.

Dhahri, E. ^{[2
]}

机构：

[1] Fac Sci Monastir, Dept Phys, Unite Rech Phys Solides, Tunis 5019, Tunisia

[2] Fac Sci Sfax, Dept Phys, Appl Phys Lab, Sfax 3018, Tunisia

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2010年 / 496卷 / 1-2期

关键词：

Sol-gel method; Cobaltite; Rhombohedral distorted perovskite; Magnetization; COLOSSAL MAGNETORESISTANCE; GIANT MAGNETORESISTANCE; TRANSITION; SUPEREXCHANGE; RESISTIVITY; MANGANITES; TRANSPORT; GLASS;

D O I：

10.1016/j.jallcom.2010.02.118

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The structural, magnetic and electrical properties of La0.67Pb0.33Mn1-xCoxO3 (0 <= x <= 0.30) perovskites prepared by the sol:gel method were investigated. The rhombohedral distorted perovskite structure with space group R (3) over barc is observed in this series of materials while the average size <r(B)> and Co content are varied simultaneously. The Rietveld refinement of the structure shows that the substitution of Mn by Co in the Mn site changes the structure parameters such as the (Mn,Co)-O bond length and (Mn,Co)-O-(Mn,Co) angles. An increase in the (Mn,Co)-O bond length with increasing Co content leads to a decrease in the paramagnetic-ferromagnetic transition temperature T-c and the metal-semiconductor transition temperature T-p. Published by Elsevier B.V.

引用

页码：69 / 74

页数：6

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