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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2020.1
- 수록면
- 531 - 539 (9page)
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Microwave dielectric properties of CaW1−x(Mo1/2Te1/2)xO4 (0.01 ≤ x ≤ 0.17) ceramics with (Mo1/2Te1/2)6+ substitution wereinvestigated. For the specimens sintered at 825–950 °C for 3 h, a single phase of a scheelite structure was observed up tox = 0.13, while secondary phases were detected above x = 0.17. The relative densities of the specimens were higher than 95%,and the grain morphologies were uniform and clean for the entire range of compositions. The quality factor (Qf) dependedon the intrinsic factors such as the W-site bond characteristics of CaWO4evaluated by the bond valence and degree of covalency,and confirmed by the full width at half maximum of the internal mode peak of Raman spectroscopy. However, Qf wasalso affected by the extrinsic factors, such as the formation of the secondary phases, which showed the maximum Qf value(167,800 GHz) at x = 0.13 and then decreased. The dielectric constant (K) increased with (Mo1/2Te1/2)6+ substitution, whichwas affected by the dielectric polarizabilities of constituent ions. As the (Mo1/2Te1/2)6+ content increased, the temperature coefficient of resonant frequency (TCF) decreased, which was associated with an increase of oxygen bond valence.
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