Phase transformation and microwave dielectric properties of BiPO4 ceramics |
| |
Authors: | In-Sun Cho Jeong-Ryeol Kim Dong-Wan Kim Kug Sun Hong |
| |
Affiliation: | (1) School of Materials Science & Engineering, College of Engineering, Seoul National University, Shillim-dong, san 56-1, Kwanak-gu, Seoul, 151-742, Korea;(2) Materials Science & Engineering Division, Korea Institute of Science and Technology, Hawolgok-dong 39-1, Seongbuk-gu, Seoul, 136-791, Korea |
| |
Abstract: | Monazite-type compounds, BiPO4 polymorphs were prepared by the solid-state reaction method. The phase transformation and microwave dielectric properties of sintered ceramics were investigated using the X-ray powder diffraction (XRD) and a network analyzer, respectively. The low-temperature phase of BiPO4 has monoclinic structure, and was transformed into the high-temperature phase with a slight distortion of monoclinic when it is heated above 600∘C. The effect of the transformation on the microwave dielectric properties was examined. It was found that the dielectric properties of each phase were significantly different. In particular, the high-temperature phase sintered at 950∘C has good microwave dielectric properties; the relative dielectric constant (ε r ) = 22, the quality factor (Q× f) = 32,500 GHz and the temperature coefficient of resonant frequency (τ f ) = − 79 ppm/ ∘C. |
| |
Keywords: | Bismuth phosphate Polymorphs Microwave dielectric properties Phase transformation |
本文献已被 SpringerLink 等数据库收录! |
|