Lanthanum molybdenum oxide

Low-temperature synthesis and characterization

S. Basu, P. Sujatha Devi, H. S. Maiti, Yongjae Lee, J. C. Hanson

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

A recently developed fast oxide ion conductor, namely lanthanum molybdenum oxide (La2Mo2O9, LAMO), was synthesized instantaneously by a citrate-nitrate auto-ignition process at a fixed citrate to nitrate ratio of 0.3 and characterized by thermal analysis, x-ray diffraction, impedance spectroscopy, and thermal expansion measurements. Crystalline LAMO has formed instantaneously during the combustion process. The signature of the order-disorder transition of stoichiometric LAMO around 570 °C was evident from differential thermal analysis, differential scanning calorimetry electrical conductivity, and thermal expansion measurements. Though the in situ x-ray measurements did not indicate any clear evidence of a phase transition, a stepwise change in the lattice parameter near the vicinity of the transition temperature was apparent thereby confirming the phase transition to be of first order in nature. The thermal expansion coefficient of LAMO was calculated to be 13.92 × 10-6/°K at 950 °C. The present method formed phase pure LAMO instantaneously and produced sintered samples with high conductivity, namely, 0.052 S/cm at 800 °C and 0.08 S/cm at 950 °C compared to LAMO prepared through various other solution routes.

Original languageEnglish
Pages (from-to)1133-1140
Number of pages8
JournalJournal of Materials Research
Volume21
Issue number5
DOIs
Publication statusPublished - 2006 May 1

Fingerprint

lanthanum oxides
Molybdenum oxide
Lanthanum
molybdenum oxides
Thermal expansion
thermal expansion
citrates
Citric Acid
Nitrates
nitrates
thermal analysis
synthesis
Phase transitions
X rays
spontaneous combustion
Order disorder transitions
Temperature
Differential thermal analysis
Oxides
Thermoanalysis

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Basu, S. ; Devi, P. Sujatha ; Maiti, H. S. ; Lee, Yongjae ; Hanson, J. C. / Lanthanum molybdenum oxide : Low-temperature synthesis and characterization. In: Journal of Materials Research. 2006 ; Vol. 21, No. 5. pp. 1133-1140.
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Lanthanum molybdenum oxide : Low-temperature synthesis and characterization. / Basu, S.; Devi, P. Sujatha; Maiti, H. S.; Lee, Yongjae; Hanson, J. C.

In: Journal of Materials Research, Vol. 21, No. 5, 01.05.2006, p. 1133-1140.

Research output: Contribution to journalArticle

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AU - Devi, P. Sujatha

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