Microwave dielectric properties of A2P2O7 (A = Ca, Sr, Ba; Mg, Zn, Mn)

被引：0

作者：

Bian, Jian-Jiang ^{[1
,2
]}

Kim, Dong-Wan ^{[1
]}

Hong, Kug Sun ^{[1
]}

机构：

[1] Sch. of Mat. Sci. and Engineering, Seoul National University, Seoul 151-742, Korea, Republic of

[2] Department of Inorganic Materials, Shanghai University, Shanghai 201800, China

来源：

Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers | 2004年 / 43卷 / 6 A期

关键词：

Alumina - Bond strength (chemical) - Ceramic materials - Electric network analyzers - Integrated circuits - Ionic conduction - Mathematical models - Microwaves - Phase transitions - Resonance - Scanning electron microscopy - Sintering - Solid state device structures - Stoichiometry;

D O I：

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中图分类号：

学科分类号：

摘要：

Microwave dielectric properties of A2P2O7 (A = Ca, Sr, Ba, Mn, Mg, Ba) ceramic materials were investigated by a network analyzer at the frequency of 10 GHz. It was found that A2P 2O7 ceramics could be sintered at relatively lower temperature below 1150°C, although the thortveitite type series, Mn 2P2O7, α-Mg2P 2O7 and α-Zn2P2O7 with smaller ionic radii of A cations were hard to sinter to full density. The dielectric constant of A2P2O7 is lower than 10. The Q × f value increased according to the sequence of δ-Ba 2P2O7, α-Sr2P 2O7 and β-Ca2P2O7 in dichromatic type series, and the sequence of Mn2P 2O7, α-Mg2P2O7 and α-Zn2P2O7 in thortveitite type series, respectively. The temperature coefficient of resonant frequency τ f for all samples exhibits negative value. Larger τf for α-Zn2P2O7, α-Mg 2P2O7 and δ-Ba2P 2O7 is mainly due to their reversible phase transformations. The microwave dielectric properties were discussed from the point view of bond valence.

引用

页码：3521 / 3525