Solid-State Metathetic Synthesis of Phase Pure BaSnO3 and BaZrO3
U. Sujana Kumari *
Department of Inorganic and Analytical Chemistry, Andhra University, Visakhapatnam, 530003, India
P. Suresh
Department of Inorganic and Analytical Chemistry, Andhra University, Visakhapatnam, 530003, India
A. A. V. Prasada Rao
Department of Inorganic and Analytical Chemistry, Andhra University, Visakhapatnam, 530003, India
*Author to whom correspondence should be addressed.
Abstract
A simple solid state metathetic synthesis has been developed for the preparation of BaSnO3 and BaZrO3 making use of BaCl2 along with Na2SnO3 and K2[ZrO(C2O4)2].3H2O as precursors. Phase pure compounds in each case were obtained at lower temperatures than those reported in literature for traditional solid-state synthesis making use of oxides and or carbonates as precursors. Phase identification was done by XRD. FTIR spectra of BaSnO3 and BaZrO3 were studied. In case of BaSnO3, a broad peak observed at 640.36 cm-1 corresponds to the characteristic stretching mode of Sn-O bonds. In case of BaZrO3, the large peak observed around 533 cm-1 is due to Zr-O vibration in the perovskite structure. Microstructural investigation indicated particle size of the order of µm. Thermal analysis of K2[ZrO(C2O4)2].3H2O indicated the presence of 3 molecules of water and observed weight loss agreed with the formation of BaZrO3 as the final product.
Keywords: Solid state metathesis, barium stannate, barium zirconate