Perovskite NdTiO3 in Sr- and Ca-doped BaO-Nd2O3-TiO2 Microwave Dielectric Ceramics
Ba6-3xNd8+2xTi18O54 (BNT) is a useful dielectric resonator at microwave frequencies. Recent work has shown that the major secondary phase in this system can be indexed as Nd4Ti9O24 (JCPDS 33-943). The present study has revealed that when half of the stoichiometric Ba+2 is replaced with Ca+2 or Sr+2, a third, tilted perovskite-structured phase, NdTiO3, is also present. It forms as coherent intragranular regions within BNT grains and always contains some of the divalent dopant species. The orientational relationship between NdTiO3 and BNT has been established.
Rick Ubic, I. M. Reaney, and W. E. Lee. "Perovskite NdTiO3 in Sr- and Ca-doped BaO-Nd2O3-TiO2 Microwave Dielectric Ceramics" Journal of Materials Research 14.4 (1999): 1576-1580.
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