Phase composition, crystal structure, infrared reflectivity and microwave dielectric properties of temperature stable composite ceramics (scheelite and zircon-type) in BiVO4–YVO4 system

Autor:	Li-Xia Pang, Di Zhou, Wen-Bo Li, Guang-Sheng Pang, Hai-Hong Xi
Rok vydání:	2015
Předmět:	Permittivity Materials science Analytical chemistry Mineralogy General Chemistry Dielectric Tetragonal crystal system symbols.namesake visual_art Materials Chemistry symbols visual_art.visual_art_medium Ceramic Raman spectroscopy Temperature coefficient Microwave Monoclinic crystal system
Zdroj:	Journal of Materials Chemistry C. 3:2582-2588
ISSN:	2050-7534 2050-7526
DOI:	10.1039/c4tc02728k
Popis:	(1 − x)BiVO4–xYVO4 (x ≤ 0.65) ceramics were prepared using the solid state reaction method. X-ray diffraction, Raman spectra and scanning electron microscopy techniques were employed to study the phase composition and crystal structure. The ceramic samples were composed of both monoclinic scheelite and tetragonal zircon-type phases. The best microwave dielectric properties, with a permittivity ∼45, a Qf value 14 000 GHz and a temperature coefficient of resonant frequency (TCF) +10 ppm °C−1, were obtained in the 0.81BiVO4–0.19YVO4 ceramic sintered at 870 °C for 2 h. Far-infrared spectra study showed that Bi–O oscillations dominate microwave dielectric polarizations in the (1 − x)BiVO4–xYVO4 ceramics. The (1 − x)BiVO4–xYVO4 ceramics might be potential candidates for microwave devices application and low temperature co-fired ceramic technology (LTCC).
Databáze:	OpenAIRE
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