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Effect of Ge4+Ion on Electrical Properties of (La0.1Ca0.9)(Mn1−xGex)O3

✍ Scribed by Hideki Taguchi; Masanori Sonoda; Mahiko Nagao

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
252 KB
Volume
140
Category
Article
ISSN
0022-4596

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✦ Synopsis

Orthorhombic perovskite-type (La 0.1 Ca 0.9 )(Mn 1؊x Ge x )O 3 was synthesized in the range (0.004 4x4 40.10). Since the ionic radius of the Ge 4؉ ion is equal to that of the Mn 4؉ ion, the (Mn, Ge)-O(1, 2) distances and the angles for (Mn, Ge)-O(1, 2)-(Mn, Ge) are independent of the composition (x). From the measurement of the electrical resistivity ( ), all manganates exhibit a metal-insulator transition. With increasing x, the metal-insulator transition temperature (T t ) increases and d /dT decreases. The cation-anion-cation overlap integrals are weakened by the Ge 4؉ ion.

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Effect of Oxygen Content on the Electrical Transport Properties of La0.4Ca0.6MnO3?y
✍ Cai, W. ;Zhao, Y.G. ;He, Y.Z. ;Zhang, L.W. ;Zhu, M.H. ;Huang, H.S. ;Liu, M.L. ;C 📂 Article 📅 2001 🏛 John Wiley and Sons 🌐 English ⚖ 102 KB 👁 2 views

The effect of oxygen content on the electrical transport properties of La 0.4 Ca 0.6 MnO 3--y was studied. Upon decreasing oxygen content, the lattice parameters a, b and c of the samples increase and the electrical resistivity of the samples also increases abruptly, contradicting what is expected i