6H hexagonal structure of low loss Ba3MTiWO9 (M = Mg, Zn) dielectrics


The crystal structure of Ba3MTiWO9 (M = Mg, Zn) oxides has been found to be 6H hexagonal, space group P6(3)/mmc, parameters of unit cell: a = 5.7943(1) angstrom, c = 14.1642(1) angstrom and a = 5.7993(1) angstrom, c = 14.1626(1) angstrom for M = Mg and Zn, respectively. The tungsten and titanium atoms are randomly distributed in pairs of face-sharing octahedra separated by octahedral layers containing magnesium or zinc. It was revealed that the structures are well ordered which is believed to result in a low dielectric loss at a microwave frequency reported for these materials. (C) 2006 Elsevier Ltd. All rights reserved.




Materials Science


Khalyavin, DD; Senos, AMR; Mantas, PQ

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