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Ba6WNb2O14 appears at least in two different polymorphs with the phase transition around 1200°C. The X-ray powder diffraction pattern of high-temperature modification corresponds merely to the niobium homologue of the hexagonal Ba6WTa2O14 (ICDD file #35-0187), while the XRD spectra of the low-temperature modification is closely related to the orthorhombic β-Ba4Nb2O9 (ICDD file #35-1155). In order to understand the crystal chemistry governing the formation of Ba6WNb2O14, the ceramic prepared by a conventional solidstate reaction, was analyzed by means of X-ray powder diffraction, scanning electron microscopy and transmission electron microscopy. The analysis of microwave dielectric data revealed a low negative coefficient of resonant frequency varying from -25 to -18 ppm/K, dielectric permittivity in the range of 15-20, and the quality factor Qxf distributed over 18 000 GHz.

Crystallographic direct observation of chemical reactions in a pore