{"title":"5Li2O-(Nb1−xMx)2O5-5TiO2 (M=Mo, W, 0<x<0.2)陶瓷的微波介电性能","authors":"Ying Wu, Zhifu Liu, Yongxiang Li","doi":"10.1109/IMWS-AMP.2015.7325053","DOIUrl":null,"url":null,"abstract":"5Li<sub>2</sub>O-(Nb<sub>1-x</sub>M<sub>x</sub>)<sub>2</sub>O<sub>5</sub>-5TiO<sub>2</sub> (M=Mo, W, 0<;x<;0.2) ceramics were prepared via solid state method. The phase composition and microwave dielectric properties were studied. There is no Mo-related phase observed even 20 mol% Mo is doped. However, the Li<sub>2</sub>WO<sub>4</sub> is clearly detected from XRD results for 5Li<sub>2</sub>O-(Nb<sub>1-x</sub>W<sub>x</sub>)<sub>2</sub>O<sub>5</sub>-5TiO<sub>2</sub> (x>0.05). Both Mo and W can lower the sintering temperature. The doped ceramics can be sintered at 1000°C which is 100°C lower than the sintering temperature of pure 5Li<sub>2</sub>O-(Nb<sub>1-x</sub>M<sub>x</sub>)<sub>2</sub>O<sub>5</sub>-5TiO<sub>2</sub> ceramic. The relative permittivity and Q×f value decrease gradually with increasing doping. And best microwave dielectric properties with a relative permittivity of 29 and a quality factor (Q×f) ~7,000 GHz (at 6.5 GHz) is achieved when 5Li<sub>2</sub>O-(Nb<sub>0.95</sub>Mo<sub>0.05</sub>)<sub>2</sub>O<sub>5</sub>-5TiO<sub>2</sub> is sintered at 1000°C/2h.","PeriodicalId":6625,"journal":{"name":"2015 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)","volume":"24 1","pages":"1-3"},"PeriodicalIF":0.0000,"publicationDate":"2015-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Microwave dielectric properties of 5Li2O-(Nb1−xMx)2O5-5TiO2 (M=Mo, W, 0<x<0.2) ceramics\",\"authors\":\"Ying Wu, Zhifu Liu, Yongxiang Li\",\"doi\":\"10.1109/IMWS-AMP.2015.7325053\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"5Li<sub>2</sub>O-(Nb<sub>1-x</sub>M<sub>x</sub>)<sub>2</sub>O<sub>5</sub>-5TiO<sub>2</sub> (M=Mo, W, 0<;x<;0.2) ceramics were prepared via solid state method. The phase composition and microwave dielectric properties were studied. There is no Mo-related phase observed even 20 mol% Mo is doped. However, the Li<sub>2</sub>WO<sub>4</sub> is clearly detected from XRD results for 5Li<sub>2</sub>O-(Nb<sub>1-x</sub>W<sub>x</sub>)<sub>2</sub>O<sub>5</sub>-5TiO<sub>2</sub> (x>0.05). Both Mo and W can lower the sintering temperature. The doped ceramics can be sintered at 1000°C which is 100°C lower than the sintering temperature of pure 5Li<sub>2</sub>O-(Nb<sub>1-x</sub>M<sub>x</sub>)<sub>2</sub>O<sub>5</sub>-5TiO<sub>2</sub> ceramic. The relative permittivity and Q×f value decrease gradually with increasing doping. And best microwave dielectric properties with a relative permittivity of 29 and a quality factor (Q×f) ~7,000 GHz (at 6.5 GHz) is achieved when 5Li<sub>2</sub>O-(Nb<sub>0.95</sub>Mo<sub>0.05</sub>)<sub>2</sub>O<sub>5</sub>-5TiO<sub>2</sub> is sintered at 1000°C/2h.\",\"PeriodicalId\":6625,\"journal\":{\"name\":\"2015 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)\",\"volume\":\"24 1\",\"pages\":\"1-3\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2015-07-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"2015 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1109/IMWS-AMP.2015.7325053\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"2015 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/IMWS-AMP.2015.7325053","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Microwave dielectric properties of 5Li2O-(Nb1−xMx)2O5-5TiO2 (M=Mo, W, 0
5Li2O-(Nb1-xMx)2O5-5TiO2 (M=Mo, W, 0<;x<;0.2) ceramics were prepared via solid state method. The phase composition and microwave dielectric properties were studied. There is no Mo-related phase observed even 20 mol% Mo is doped. However, the Li2WO4 is clearly detected from XRD results for 5Li2O-(Nb1-xWx)2O5-5TiO2 (x>0.05). Both Mo and W can lower the sintering temperature. The doped ceramics can be sintered at 1000°C which is 100°C lower than the sintering temperature of pure 5Li2O-(Nb1-xMx)2O5-5TiO2 ceramic. The relative permittivity and Q×f value decrease gradually with increasing doping. And best microwave dielectric properties with a relative permittivity of 29 and a quality factor (Q×f) ~7,000 GHz (at 6.5 GHz) is achieved when 5Li2O-(Nb0.95Mo0.05)2O5-5TiO2 is sintered at 1000°C/2h.
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