Phase stability of BaZr0.2Ti0.8O3 and La0.8Sr0.2MnO3 phases in the ceramic composite under conventional sintering. (2020)

• Record Type: Journal Article
• Authors: Gaur, Anshu; Srinath, S.
• Is Part Of: Materials today. Volume 28:Part 1(2020)
• Page Start: 290
• Page End: 293
• Publication Date: 2020
• Subjects: Zr doped BaTiO3 -- Phase stability -- Magnetite -- Magnetoelectric composite -- Ferroelectric; Materials science -- Congresses -- Periodicals; 620.1
• DOI: 10.1016/j.matpr.2020.02.125
• Languages: English
• ISSNs: 2214-7853

Abstract

Abstract: Stability of 20 mol% Zr doped BaTiO3 (BZT20) and 20 mol% Sr doped LaMnO3 (LSM20) phases in their ceramic composite under the conventional heat treatment is discussed. (1−x)BZT20-xLSM20 x = 0, 0.25, 0.5, 0.75 and 1.0 composites are prepared from mechanical mixing of sol–gel synthesized BZT20 and LSM20 powders. The composite powders were pelletized under 610 MPa hydraulic pressure, sintered at the temperatures of 900 and 1000 °C for 12 h and characterized for the phase structure by X-ray diffractometer. Crystal structure of the pure phases is established from the Rietveld refinement method. Weight fraction of the phases is estimated from the internal standard method. The stoichiometric observation is correlated with the data available in the literature. It is observed that the A-site cations of the two phases start, though weakly, inter-diffusing at the lower temperature of 900 °C. The two phases at the temperature of 1000 °C partially dissolves into each other with the segregation of Zr-Ti-O based oxide as an intermediate phase. The shift in the LSM20 peak by Ba 2+ substitution for La 3+ and segregation of Zr-Ti-O is stronger in 75:25 and 25:75 compositions respectively due to percolation effect.