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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Effect of Zn and Ca modifications on crystallization and microwave dielectric properties of lanthanum borates
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Effect of Zn and Ca modifications on crystallization and microwave dielectric properties of lanthanum borates

机译：Zn和Ca改性对硼酸镧结晶和微波介电性能的影响

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摘要

Low loss dielectrics based on two borate glasses, (13-19)CaO-(13-19)La_2O_3-68B_2O_3 and (13-19)ZnO(13-19)La_2O_3.68B_2O_3, have been investigated with a focus on effects of the CaO/La_2O_3 and ZnO/La_2O_3 ratios on physical and dielectric properties. All samples were prepared by mixing glass with 40 wt% Al_2O_3 filler and by firing at 850 °C for 30 min. The effects of increasing relative contents of Ca and Zn were found to be opposite specifically in microstructure evolution and crystallization behavior, and thus, dielectric properties. For example, the 13Ca019La_2O_3-B_2O_3 sample having the lowest Ca content showed the highest Q × f of ~8100, while the 19Zn013La_2O_3-B_2O_3 sample having the highest Zn content showed the highest Q× f of ~18,100. The extensive crystallization of low loss phases, i.e., LaBO_3 and LaAl_2O_3(B_4O_(10))O_(0.54), as well as the improved level of densification are assumed to be responsible for better dielectric performance.
机译：已经研究了基于两种硼酸盐玻璃（13-19）CaO-（13-19）La_2O_3-68B_2O_3和（13-19）ZnO（13-19）La_2O_3.68B_2O_3的低损耗电介质，重点是CaO / La_2O_3和ZnO / La_2O_3对物理和介电性能的比率。通过将玻璃与40 wt％的Al_2O_3填料混合并在850°C下煅烧30分钟来制备所有样品。发现钙和锌的相对含量增加的影响在微观结构演变和结晶行为以及介电性能方面特别相反。例如，具有最低Ca含量的13Ca019La_2O_3-B_2O_3样品显示最高的Q×f为〜8100，而具有最高Zn含量的19Zn013La_2O_3-B_2O_3样品显示的最高Q×f为〜18,100。假定低损耗相LaBO_3和LaAl_2O_3（B_4O_（10））O_（0.54）的大量结晶以及更高的致密化水平可带来更好的介电性能。

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