Low-temperature sintering of temperature-stable LaNbO4 microwave dielectric ceramics

Title
Low-temperature sintering of temperature-stable LaNbO4 microwave dielectric ceramics
Authors
이항원박정현남산김동완박재관
Keywords
ceramics; microwave; Dielectric properties; lanthanium niobate; microstructure; oxides; Electron microscopy; *2009년 개인평가에 반영완료
Issue Date
2010-01
Publisher
Materials research bulletin
Citation
VOL 45, NO 1, 21-24
Abstract
We demonstrate the correlation between sintering behavior and microstructural observations in lowtemperature sintered, LaNbO4 microwave ceramics. Small CuO additions to LaNbO4 significantly lowered the sintering temperature from 1250 to 950 8C. To elucidate the sintering mechanism, the internal microstructure of the sample manipulated by a focused ion beam (FIB) was investigated using transmission electron microscopy (TEM) and energy-dispersive spectroscopy (EDS). LaNbO4 with 3 wt% CuO sintered at 950 8C for 2 h possessed the following excellent microwave dielectric properties: a quality factor (Qxf) of 49,000 GHz, relative dielectric constant (er) of 19.5, and temperature coefficient of resonant frequency (tf) of 1 ppm/8C. The ferroelastic phase transformation was also investigated using in situ X-ray diffraction (XRD) to explain the variation of tf in low-temperature sintered LaNbO4 as a function of CuO content.
URI
http://pubs.kist.re.kr/handle/201004/36599
ISSN
0025-5408
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KIST Publication > Article
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