Effect of annealing on polycrystalline La1-xNaxMnOz ceramics

Authors
Li, ZQ Jiang, EY Zhang, DX Hou, DL Li, WC Bai, HL
Citation
Zq. Li et al., Effect of annealing on polycrystalline La1-xNaxMnOz ceramics, PHYS LETT A, 277(1), 2000, pp. 56-60
Citations number
29
Categorie Soggetti
Physics
Journal title
PHYSICS LETTERS A
ISSN journal
03759601 → ACNP
Volume
277
Issue
1
Year of publication
2000
Pages
56 - 60
Database
ISI
SICI code
0375-9601(20001113)277:1<56:EOAOPL>2.0.ZU;2-#
Abstract
The structure, magnetic and transport properties of La1-xNaxMnOz manganese perovskite prepared by Pechini process were investigated. Low held magnetor esistance in temperature range from 77 K to Curie temperature was obtained and two obvious peaks were observed in the resistivity versus temperature c urves. Differential scanning calorimetry results show that the broad humps far below Curie temperature does not originate from anomalous phase transit ion. The effect of annealing is carefully investigated and the results indi cate that oxygen inhomogeneous distribution may be the main reason for the curious behaviors. (C) 2000 Elsevier Science B.V. All rights reserved.