| 低温烧结Mg_4Nb_2O_9微波介质陶瓷(英文) |
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| 引用本文： | 姚国光,裴翠锦,田秀劳.低温烧结Mg_4Nb_2O_9微波介质陶瓷(英文)[J].硅酸盐学报,2009,37(6). |
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| 作者姓名： | 姚国光 裴翠锦 田秀劳 |
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| 作者单位： | 1. 西安邮电学院应用数理系,西安,710121
2. 运城学院应用化学系,山西,运城,044000 |
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| 摘 要： | 分别研究了不同含量Li2CO3/V2O5共掺杂和部分Li取代Mg对Mg4Nb2O9基陶瓷烧结特性、显微结构和微波介电性能的影响.结果表明:Li2CO3/V2O5共掺杂或部分Li取代Mg,均能使Mg4Nb2O9基陶瓷的烧结温度从1 400℃降至950℃,但其烧结机理不同.Li2CO3/V2O5共掺杂Mg4Nb2O9(MNLV)样品中的低熔点液相,使MNLV陶瓷的致密化烧结温度降低.部分Li取代Mg显著降低了(Mg(4-x)Lix)(Nb1.92V0.08)O(9-δ)(MLNV)样品的致密化烧结温度.950℃烧结,相对于MNLV样品的品质因数(Q=13276)而言,MLNV样品的Q值(1 759)显著恶化,这是由于Li1+占据Mg2+晶格.使晶体中非谐振项损耗增加.
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| 关 键 词： | 铌酸镁 介电性能 低温烧结 烧结助剂 |
LOW-TEMPERATURE SINTERING OF Mg_4Nb_2O_9 MICROWAVE DIELECTRIC CERAMICS |
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| YAO Guoguang,PEI Cuijing,TIANXiulao.LOW-TEMPERATURE SINTERING OF Mg_4Nb_2O_9 MICROWAVE DIELECTRIC CERAMICS[J].Journal of The Chinese Ceramic Society,2009,37(6). |
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| Authors: | YAO Guoguang PEI Cuijing TIANXiulao |
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| Affiliation: | 1.Department of Applied Mathematics and Physics;Xi'an Institute of Posts and Telecommunications;Xi'an 710121;2.Department of Applied Chemistry;Yuncheng University;Yuncheng 04000;Shanxi;China |
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| Abstract: | The sintering behavior, microstructures and microwave dielectric properties of Mg4Nb2O9 matric ceramics with Li2CO3/V2O5 co-doped and small amount of Li1+ substitution for Mg2+ were investigated, respectively. The results show that the addition of Li2CO3/V2O5 or Li1+ substitution for Mg2+ in Mg4Nb4O9 matric ceramics lowers the sintering temperature from 1400 ℃ to 950 ℃, but the sintering mechanisms are different. A liquid phase could be responsible for enhanced sintering in Mg4Nb2O9 sample (MNLV) combined with Li2CO3/V2O5. The densification temperature for sample (Mg(4-x)Lix)(Nb1.92V0.08)O(9-δ) (MLNV) becomes lower due to the decreased temperature of liquidus according to the substitution of Li for Mg ions. The quality factor of sample MLNV (1 759) sintered at 950 ℃ is degraded drastically, compared to that of sample MNLV (13 276), which can be attributed to the increase of anharmonic-interaction-effect dielectric loss caused by Li1+ substitution for Mg2+. |
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| Keywords: | magnesium niobate dielectric properties low-temperature sintering sintering aids |
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