{"title":"Ca5-xMgxNb4TiO17 (x = 0-3)陶瓷的微波介电性能","authors":"P. Anjana, T. Joseph, M. Sebastian","doi":"10.1109/AEMC.2007.4638035","DOIUrl":null,"url":null,"abstract":"The Ca<sub>5-x</sub>Mg<sub>x</sub>Nb<sub>4</sub>TiO<sub>17</sub> (x = 0-3) ceramics were prepared by conventional solid state ceramic route. The microstructure of the ceramic was studied using scanning electron spectroscopy. The microwave dielectric properties (Q<sub>u</sub>xf, epsiv<sub>r</sub> and tau<sub>f</sub>) were measured using a vector network analyser. Ca<sub>5</sub>Nb<sub>4</sub>TiO<sub>17</sub> ceramics have a relative permittivity(epsiv<sub>r</sub>) of 45, quality factor (Q<sub>u</sub>xf) of 17600 GHz (at 4.13 GHz), and coefficient of temperature variation of resonant frequency (tau<sub>f</sub>)-113 ppm/degC. The variation in the microwave dielectric properties of Ca<sub>5</sub>Nb<sub>4</sub>TiO<sub>17</sub> ceramics were investigated with the increase in magnesium content. The sintering temperature reduced from 1475degC for x = 0 to 1200degC for x = 3. The quality factor increased with magnesium content and maximum Q<sub>u</sub>xf was obtained for the composition x = 2 (22500 GHz (at 3.99 GHz)). The epsiv<sub>r</sub> and tau<sub>f</sub> of Ca<sub>3</sub>Mg<sub>2</sub>Nb<sub>4</sub>TiO<sub>17</sub> ceramics were found to be 37.5 and -4.3 ppm/degC respectively. Hence Ca<sub>3</sub>Mg<sub>2</sub>Nb<sub>4</sub>TiO<sub>17</sub> ceramics are very much useful for practical applications like Dielectric resonators in filters and oscillators.","PeriodicalId":397229,"journal":{"name":"2007 IEEE Applied Electromagnetics Conference (AEMC)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"4","resultStr":"{\"title\":\"Microwave dielectric properties of Ca5-xMgxNb4TiO17 (x = 0–3) ceramics\",\"authors\":\"P. Anjana, T. Joseph, M. Sebastian\",\"doi\":\"10.1109/AEMC.2007.4638035\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The Ca<sub>5-x</sub>Mg<sub>x</sub>Nb<sub>4</sub>TiO<sub>17</sub> (x = 0-3) ceramics were prepared by conventional solid state ceramic route. The microstructure of the ceramic was studied using scanning electron spectroscopy. The microwave dielectric properties (Q<sub>u</sub>xf, epsiv<sub>r</sub> and tau<sub>f</sub>) were measured using a vector network analyser. Ca<sub>5</sub>Nb<sub>4</sub>TiO<sub>17</sub> ceramics have a relative permittivity(epsiv<sub>r</sub>) of 45, quality factor (Q<sub>u</sub>xf) of 17600 GHz (at 4.13 GHz), and coefficient of temperature variation of resonant frequency (tau<sub>f</sub>)-113 ppm/degC. The variation in the microwave dielectric properties of Ca<sub>5</sub>Nb<sub>4</sub>TiO<sub>17</sub> ceramics were investigated with the increase in magnesium content. The sintering temperature reduced from 1475degC for x = 0 to 1200degC for x = 3. The quality factor increased with magnesium content and maximum Q<sub>u</sub>xf was obtained for the composition x = 2 (22500 GHz (at 3.99 GHz)). The epsiv<sub>r</sub> and tau<sub>f</sub> of Ca<sub>3</sub>Mg<sub>2</sub>Nb<sub>4</sub>TiO<sub>17</sub> ceramics were found to be 37.5 and -4.3 ppm/degC respectively. Hence Ca<sub>3</sub>Mg<sub>2</sub>Nb<sub>4</sub>TiO<sub>17</sub> ceramics are very much useful for practical applications like Dielectric resonators in filters and oscillators.\",\"PeriodicalId\":397229,\"journal\":{\"name\":\"2007 IEEE Applied Electromagnetics Conference (AEMC)\",\"volume\":\"29 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2007-12-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"4\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"2007 IEEE Applied Electromagnetics Conference (AEMC)\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1109/AEMC.2007.4638035\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"2007 IEEE Applied Electromagnetics Conference (AEMC)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/AEMC.2007.4638035","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Microwave dielectric properties of Ca5-xMgxNb4TiO17 (x = 0–3) ceramics
The Ca5-xMgxNb4TiO17 (x = 0-3) ceramics were prepared by conventional solid state ceramic route. The microstructure of the ceramic was studied using scanning electron spectroscopy. The microwave dielectric properties (Quxf, epsivr and tauf) were measured using a vector network analyser. Ca5Nb4TiO17 ceramics have a relative permittivity(epsivr) of 45, quality factor (Quxf) of 17600 GHz (at 4.13 GHz), and coefficient of temperature variation of resonant frequency (tauf)-113 ppm/degC. The variation in the microwave dielectric properties of Ca5Nb4TiO17 ceramics were investigated with the increase in magnesium content. The sintering temperature reduced from 1475degC for x = 0 to 1200degC for x = 3. The quality factor increased with magnesium content and maximum Quxf was obtained for the composition x = 2 (22500 GHz (at 3.99 GHz)). The epsivr and tauf of Ca3Mg2Nb4TiO17 ceramics were found to be 37.5 and -4.3 ppm/degC respectively. Hence Ca3Mg2Nb4TiO17 ceramics are very much useful for practical applications like Dielectric resonators in filters and oscillators.
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