PHASE TRANSITION IN LAMOX TYPE COMPOUNDS

M. Ali

doi:10.1007/s10973-008-9532-y

2009-02-04

PRE

M. Ali

B.N. Wani

S.R. Bharadwaj *

DOI：10.1007/s10973-008-9532-y

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摘要

En 中文

La2Mo2O9 (LMO) was synthesized at lower temperature 973 K (LT-phase) by ceramic route. Differential thermal analysis (DTA) scan of LT-phase of LMO showed alpha ->beta transition at 843 K during heating and beta ->alpha conversion via a metastable gamma-phase during cooling. This was also confirmed by thermo-dilatometry and impedance spectroscopy. La2Mo1.95V0.05O9-delta (LMVO), La1.96Sr0.04Mo2O9-delta (LSMO) and La1.96Sr0.04Mo1.95V0.05O9-delta (LSMVO) were prepared in a similar way. These compounds exhibited alpha ->beta transition on heating with shift in transition temperature, but the existence of gamma-phase during cooling disappeared. Substitution increased the ionic conductivity of alpha-phase and reduced that of beta-phase.

Keyword:

dilatometry

electrical conductivity

La2Mo2O9

Phase transition

X-ray diffraction

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期刊

Journal of Thermal Analysis and Calorimetry

IF:

3.1

论文数:

1.8W

被引数:

3.2W

机构

bhabha atomic research center (barc)

学者数:

7.4K

论文数: 8.1K

被引数: 1

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