ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
The metal–nonmetal (MN) transition data of mixed valent manganese oxide perovskitesA1−xAx′MnO3 (A: trivalent lanthanide metals, A′: divalent metals, 0.2〈x〈0.5) are analyzed in terms of the tolerance factor (t), and the standard deviation (σ) of the A-site cation sizes. The interplay of these two parameters that measure the overall and atomic scale distortions, respectively, determine whether a compound can show a MN transition or not and its transition temperature (TMN). In order to show a MN transition, a compound should have t〉0.906 andσ(approximately-less-than)σ=232t−202 (pm). Large t and small σ are favorable for high TMN.TMN data ofA0.7Ba0.15Sr0.15MnO3 (A=La, Pr, Nd, Sm),A0.7Ba0.15Ca0.15MnO3 (A=La, Pr, Nd, Sm),(La0.7Ca0.3)x(Gd0.7Ba0.3)1−xMnO3 (x=0.1, 0.3, 0.5, 0.7, 0.9), and(Nd0.7Ca0.3)x(Gd0.7Ba0.3)1−xMnO3(x=0.25, 0.3, 0.5, 0.55, 0.7, 0.75) newly synthesized are reported. © 1997 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.366257
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