Indian Journal of Pure and Applied Physics

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Micro-Structure and Vibrational Mode of Complex Double Perovskite Oxides xLaAlO3 – (1-x)Ba(Mg1/2 W1/2 )O3


Affiliations
1 St. Paul’s Cathedral Mission College, 33/1 Raja Rammohan Roy Sarani, Kolkata -700 009, India
2 Department of Physics, University of Calcutta, 92 Acharya Prafulla Chandra Road, Kolkata -700 009, India
3 Department of Physics, Bose Institute, 93/1 Acharya Prafulla Chandra Road, Kolkata -700 009, India

The micro-structures and vibrational modes of complex double perovskite oxides xLaAlO3 – (1-x)Ba(Mg1/2 W1/2 )O3[LA-BMW] have been characterized for different values of x (0.10, 0.25, 0.50, 0.75 and 0.90). The materials are synthesized by the solid state reaction technique. The Rietveld refinement of the XRD patterns shows rhombohedral (161) phase for LaAlO3 and cubic (225) phases for Ba(Mg1/2W1/2)O3. XRD patterns show that with increasing the doping concentration ‘x’, rhombohedral phase gradually increases and cubic phase gradually decreases. A meticulous comparison of crystal structures and vibrational degrees of freedom in the light of change in doping concentration ‘x’ for LA-BMW has been carried out for accurate identification of crystal symmetry and distortions. From room-temperature comparative Raman spectra of the samples, different vibrational phonon modes have been assigned using group theoretical analysis together with experimental literature survey.
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  • Micro-Structure and Vibrational Mode of Complex Double Perovskite Oxides xLaAlO3 – (1-x)Ba(Mg1/2 W1/2 )O3

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Authors

Binita Ghosh
St. Paul’s Cathedral Mission College, 33/1 Raja Rammohan Roy Sarani, Kolkata -700 009, India
Bivas Patra
Department of Physics, University of Calcutta, 92 Acharya Prafulla Chandra Road, Kolkata -700 009, India
Sourish Banerjee
Department of Physics, University of Calcutta, 92 Acharya Prafulla Chandra Road, Kolkata -700 009, India
T.P. Sinha
Department of Physics, Bose Institute, 93/1 Acharya Prafulla Chandra Road, Kolkata -700 009, India

Abstract


The micro-structures and vibrational modes of complex double perovskite oxides xLaAlO3 – (1-x)Ba(Mg1/2 W1/2 )O3[LA-BMW] have been characterized for different values of x (0.10, 0.25, 0.50, 0.75 and 0.90). The materials are synthesized by the solid state reaction technique. The Rietveld refinement of the XRD patterns shows rhombohedral (161) phase for LaAlO3 and cubic (225) phases for Ba(Mg1/2W1/2)O3. XRD patterns show that with increasing the doping concentration ‘x’, rhombohedral phase gradually increases and cubic phase gradually decreases. A meticulous comparison of crystal structures and vibrational degrees of freedom in the light of change in doping concentration ‘x’ for LA-BMW has been carried out for accurate identification of crystal symmetry and distortions. From room-temperature comparative Raman spectra of the samples, different vibrational phonon modes have been assigned using group theoretical analysis together with experimental literature survey.