Low loss La5?em class="a-plus-plus">x Sr x Ti4+x Al1?em class="a-plus

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• 作者：Yaseen Iqbal ; Raz Muhammad
• 关键词：La5Ti4AlO17 ; strontium ; microwave dielectric properties ; ceramics
• 刊名：Electronic Materials Letters
• 出版年：2015
• 出版时间：May 2015
• 年：2015
• 卷：11
• 期：3
• 页码：383-387
• 全文大小：837 KB
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• 作者单位：Yaseen Iqbal (1)
  Raz Muhammad (1)
  
  1. Materials Research Laboratory, Department of Physics, University of Peshawar, Peshawar, 25120, Pakistan
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Condensed Matter Physics
  Electronics, Microelectronics and Instrumentation
  Optical and Electronic Materials
  Thermodynamics
  Characterization and Evaluation of Materials
  
• 出版者：The Korean Institute of Metals and Materials, co-published with Springer Netherlands
• ISSN：2093-6788

文摘

La_{5?em class="EmphasisTypeItalic">x} Sr _x Ti_4+x Al_{1?em class="EmphasisTypeItalic">x} O₁₇ (x = 0, 0.20, 0.25 and 0.30) ceramics were prepared through a mixed oxide solid state sintering route and characterized in terms of phase, crystal structure, microstructure and microwave dielectric properties. La₅Ti₄AlO₁₇ exhibited reasonable relative permittivity μ _r ~ 42, a high quality factor Q×f _o ~ 18906 GHz but the temperature coefficient of resonance frequency τ _f ~ ?9 ppm/°C was too low for practical applications. In order to tune τ _f through zero, Sr was substituted for La which increased ε _r to 47.1, decreased Q × f _o to 16678 GHz and decreased negative τ _f to ?.8 ppm/°C at x = 0.25. The observed decrease in negative τ _f may be due an increase in tolerance factor and hence change in tilt scheme of BO₆ octahedra as a result of substitution of larger cations for smaller cations.