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Phase composition, crystal structure, complex chemical bond theory and microwave dielectric properties of high-Q materials in a (Nd1-xYx)NbO4 system

机译：相 - （ND1-XYX）NBO4系统中高Q材料的相组成，晶体结构，复合化学键理论和微波介电性能

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摘要

In this paper, (Nd1-xYx)NbO4 ceramics are prepared via a conventional solid-state reaction method and their microwave dielectric properties have been reported for the first time. The Rietveld refinement was used to investigate the crystal structure of (Nd1-xYx)NbO4 ceramics. Based on the refined results, the NdNbO4 ceramics have a monoclinic fergusonite structure (I2/a (15) space group, Z = 4). The XRD patterns present a single monoclinic phase of NdNbO4 in the range of x = 0.02 to 0.1, with a further increase in the substitution content of Y3+ ions, few impurity phases are formed. In order to evaluate the correlations between complex chemical bond theory and microwave dielectric properties, the ionic polarization, lattice energy and bond energy were calculated using the refined lattice parameters and bond length. The effects of substituting Y3+ ions for Nd3+ ions on the microwave dielectric properties of the (Nd1-xYx)NbO4 ceramics were also discussed. The increase in the dielectric constant epsilon(r) is due to increasing the corrected theoretical dielectric constant epsilon(rc). For high relative density samples, the Q x f values and tau(f) values are really dependent upon the calculated lattice energy and bond energy. High-quality factor microwave dielectric materials can be obtained with x = 0.08 in the (Nd1-xYx)NbO4 system, and show excellent dielectric properties of tau(r) = 19.87, Q x f = 81 100 GHz and tau(f) = -18.84 ppm degrees C-1.
机译：本文通过常规固态反应方法制备NBO4陶瓷，首次报道了它们的微波介电性质。 RIETVELD细化用于研究（ND1-XYX）NBO4陶瓷的晶体结构。基于精制的结果，NDNBO4陶瓷具有单斜氟钨矿结构（I2 / A（15）空间组，Z = 4）。 XRD图案在X = 0.02至0.1的范围内呈现NDNBO4的单晶相，随着Y3 +离子的取代含量进一步增加，形成了很少的杂质相。为了评估复杂化学粘合理论和微波介电性质之间的相关性，使用精制晶格参数和粘合长度计算离子偏振，晶格能量和粘合能。还讨论了替代Y3 +离子对（ND1-XYX）NBO4陶瓷微波介电性质对ND3 +离子的影响。介电常数ε（R）的增加是由于增加了校正的理论介电常数ε（RC）。对于高相对密度样本，Q×F值和TAU（F）值真正取决于计算的格子能量和粘合能量。高质量因子微波介电材料可以在（ND1-XYX）NBO4系统中用X = 0.08获得，并显示出优异的Tau（R）= 19.87，Q XF = 81 100 GHz和Tau（F）= - 18.84 ppm度C-1。

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  • 来源
    《RSC Advances》 |2015年第118期|共9页
  • 作者

    Zhao Yonggui; Zhang Ping;

  • 作者单位

    Tianjin Univ Sch Elect &

    Informat Engn Tianjin 300072 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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