Effect of calcium doping on lattice parameters resulting in structural distortions of SrBi2Nb2O9 ferroelectric ceramics

Vaibhav Shrivastava; A. K. Jha; R. G. Mendiratta

doi:10.1117/12.514895

14 October 2003 Effect of calcium doping on lattice parameters resulting in structural distortions of SrBi₂Nb₂O₉ ferroelectric ceramics

Vaibhav Shrivastava, A. K. Jha, R. G. Mendiratta

Author Affiliations +

Proceedings Volume 5062, Smart Materials, Structures, and Systems; (2003) https://doi.org/10.1117/12.514895
Event: Smart Materials, Structures, and Systems, 2002, Bangalore, India

Abstract

Studies on the effect of 10 - 50 atomic % Ca doping on structural distortions are reported in the present work. Bismuth layered structured ferroelectrics oxides of the composition Sr_1-xCa_xBi₂Nb₂O₉; with x = 0.0 - 0.5 were synthesized by the solid-state reaction method. X-ray diffraction analysis revealed the formation of perovskite ferroelectric ceramic sample and a few additional peaks were observed as concentration of calcium varied from 10 to 50%, gradual shift in peaks with doping is discussed with respect to observed anomalous change in lattice parameters. Also, transformation of structure from pseudo-orthorhombic to pseudo-tetragonal phase is observed at room temperature as concentration of calcium is increased. This suggests that structural distortions are pronounced in such a manner so as to stabilize the structure of unit cell, which may lead to high value of Curie temperature and remanent polarization useful in non-volatile random access memory (NvRAM) devices.

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Vaibhav Shrivastava, A. K. Jha, and R. G. Mendiratta "Effect of calcium doping on lattice parameters resulting in structural distortions of SrBi₂Nb₂O₉ ferroelectric ceramics", Proc. SPIE 5062, Smart Materials, Structures, and Systems, (14 October 2003); https://doi.org/10.1117/12.514895

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