Effect of Zn²⁺ substitution on the microwave dielectric properties of LiMgPO₄ and the development of a new temperature stable glass free LTCC

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• 作者：Dhanesh Thomas ; Mailadil T. Sebastian ; ^{mailadils@yahoo.com} ; ^{mtsebastian@niist.res.in}
• 关键词：Sintering ; Porosity ; Dielectric properties ; Substrates ; Glass free LTCC
• 刊名：Journal of the European Ceramic Society
• 出版年：2012
• 期刊代码：53_09552219
• 类别：ms
• 出版时间：August, 2012
• 卷：32
• 期：10
• 页码：2359-2364
• 文件大小：751 K

摘要

The LiMg_(1鈭?em>x)Zn_xPO₄ ceramics have been prepared by the solid state ceramic route. The LiMg_(1鈭?em>x)Zn_xPO₄ ceramic retains the orthorhombic structure up to x = 0.2. The compositions with 0.3 鈮?#xA0;x 鈮?#xA0;0.8 exist as a mixture of orthorhombic and monoclinic phases. When Mg²⁺ is fully replaced with Zn²⁺ (x = 1.0) complete transition to monoclinic phase occurs. The ceramic with x = 0.1 (LiMg_0.9Zn_0.1PO₄) sintered at 925 掳C exhibits low relative permittivity (蓻_r) of 6.7, high quality factor (Q_u 脳 f) of 99,700 GHz with a temperature coefficient of resonant frequency (蟿_f) of 鈭?2 ppm/掳C. The slightly large 蟿_f is adjusted nearly to zero with the addition of TiO₂. LiMg_0.9Zn_0.1PO₄-TiO₂ composite with 0.12 volume fraction TiO₂ sintered at 950 掳C shows good microwave dielectric properties: 蓻_r = 10.1, Q_u 脳 f = 52,900 GHz and 蟿_f = 鈭? ppm/掳C. The ceramic is found to be chemically compatible with silver.