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Lanthanum molybdenum oxide: Low-temperature synthesis and characterization

IR@CGCRI: CSIR-Central Glass and Ceramic Research Institute, Kolkata

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Title Lanthanum molybdenum oxide: Low-temperature synthesis and characterization
Creator Basu, S
Sujatha Devi, P
Maiti, Himadri Sekhar
Lee, Y
Hanson, J C
Description 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 degrees 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 x 10(-6)/ degrees K at 950 degrees C. The present method formed phase pure LAMO instantaneously and produced sintered samples with high conductivity, namely, 0.052 S/cm at 800 degrees C and 0.08 S/cm at 950 degrees C compared to LAMO prepared through various other solution routes.
Publisher Materials Research Society
Date 2006-05
Type Article
Format application/pdf
Identifier http://cgcri.csircentral.net/195/1/basu2006.pdf
Basu, S and Sujatha Devi, P and Maiti, Himadri Sekhar and Lee, Y and Hanson, J C (2006) Lanthanum molybdenum oxide: Low-temperature synthesis and characterization. Journal of Materials Research, 21 (5). pp. 1133-1140. ISSN 0884-2914
Relation http://cgcri.csircentral.net/195/