08/03/2020: 4:00 PM
2020: 70th ACA Annual Meeting
Presenting Author :
University of Bordeaux, ICMCB, UMR 5026, 33600 Pessac, FRANCE
Pressure assisted synthesis is a proven route for expanding the explorable range of phase space in order to discover and stabilize new metastable ABO...3 perovskite-type structures. Recently, a new class of complex perovskites termed quadruple perovskites (QPv) have been investigated for their unusual cation ordering and interesting ferroic properties . One intriguing member of this family is CaMnTi...2O...6, which displays ferroelectric character (T...C = 630K) and was previously reported by High-Pressure High-Temperature (HP-HT) synthesis methods at 1200°C -1700 °C and 7 GPa . A recent work  showed that related Ca-rich compositions in the Ca...(2-x)Mn...xTi...2O...6 series could be achieved at much lower pressures (100 MPa) using a Spark Plasma Sintering (SPS) approach. Our present study explores the optimized P-T synthesis conditions for compositions across the Ca...(2-x)Mn...xTi...2O...6 series under a variety of different synthetic techniques (HP-HT, SPS, etc.). Furthermore, the effect of varying synthetic parameters (Ca/Mn ratio, pressure, temperature, SPS current, etc.) on competing phase stabilities, structural distortions, and cation ordering in Ca...(2-x)Mn...xTi...2O...6 series of QPv is discussed. Finally, connections are proposed concerning the structure-property relationship, in particular for the ferroelectric transition temperature (T...C) and dielectric permittivity response.
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Journal of Chemical Crystallography