以反應燒結法製備摻雜添加物之Zn0.5Ti0.5NbO4及ZnTiO3陶瓷微波介電特性研究

Investigation of Microwave Dielectric Properties of Doped Zn0.5Ti0.5NbO4 and ZnTiO3 Ceramics by Reaction-Sintering Process

李威廷(Wei-Ting Li)

指導教授 ： 劉依政

崑山科技大學/工程學院/電子工程研究所/碩士(2011年)

摘要

本論文以反應燒結法製備摻雜少量NiO及混合CaTiO3之Zn0.5Ti0.5NbO4陶瓷體，以及摻雜少量Mg(OH)2之ZnTiO3陶瓷體，並分別研究其生成相(Phases)、微結構(Microstructure)及微波介電(Microwave Dielectric)等特性。在2小時的燒結過程中，ZTN-CT(0.95 Zn0.5Ti0.5NbO4-0.05CaTiO3)陶瓷其主要相為ZnTiNb2O8，並伴隨著二次相CaNb2O6的生成，在1100℃燒結6小時可達最佳密度5.21 g/cm3，收縮率為18.74%，在1000oC燒結4小時有最佳微波介電特性表現εr 為29.2，Q×f≒10,770GHz，τf ≒－33.76 ppm/oC；ZNTN((Zn0.8Ni0.2)0.5Ti0.5NbO4)陶瓷，其主要相與ZnTiNb2O8相似，並有二次相Ni0.5Ti0.5NbO4生成，隨著燒結溫度的增加，二次相的繞射峰值亦更顯得強烈，在1250℃燒結6小時可達最佳密度5.29 g/cm3，收縮率為17.37%，在1150oC燒結2小時有最佳微波介電特性表現εr 為38.58，Q×f≒16,544GHz，τf ≒－4.52 ppm/oC。ZT(ZnTiO3)陶瓷，其主要相為α-Zn2TiO4，並有二次相TiO2 (rutile)存在，在1250oC燒結4小時可得到最佳密度4.96 g/cm3，收縮率為16.04%，在1250oC燒結6小時有最佳微波介電特性表現εr 為29.38，Q×f≒20,113GHz，τf ≒＋31.42 ppm/oC；ZMT(Zn0.93Mg0.07TiO3)陶瓷，其主要相為α-Zn2TiO4，並與Mg2+離子反應形成固溶體，另外亦伴隨著二次相TiO2 (rutile)存在，在1250oC燒結6小時可得到最佳密度4.91g/cm3，收縮率為15.99%，在1150oC燒結6小時有最佳微波介電特性表現εr 為28.92，Q×f≒20,314GHz，τf ≒＋35.22 ppm/oC。

關鍵字

反應燒結法 ； 微波介電陶瓷

並列摘要

In this paper, phase formation, microstructure and microwave dielectric properties of doped Zn0.5Ti0.5NbO4 and ZnTiO3 ceramics by the reaction-sintering process were investigated. The main phase ZnTiNb2O8 accompanied by second phase CaNb2O6 formed in ZTN-CT (0.95Zn0.5Ti0.5NbO4-0.05CaTiO3) ceramic. The optimum density and shrinkage were 5.21 g/cm3 and 18.74%, respectively. εr＝29.2, Q×f≒ 10,770GHz, τf ≒－33.76 ppm/oC were found for 1100oC/4h sintering ZTN-CT. The main phase with a same structure of ZnTiNb2O8 formed in ZNTN ((Zn0.8Ni0.2)0.5Ti0.5NbO4) ceramic. Second phase Ni0.5Ti0.5NbO4 formed in ZNTN especially when sintering temperature increased. The optimum density and shrinkage were 5.29 g/cm3 and 17.37%, respectively. εr＝38.58, Q×f≒16,544GHz, τf≒－4.52 ppm/oC were obtained for 1150oC/2h sintering ZNTN. The main phaseα-Zn2TiO4 accompanied by TiO2 (rutile) formed in ZT (ZnTiO3) ceramic. The optimum density and shrinkage were 4.96 g/cm3 and 16.04%, respectively. εr＝29.38, Q×f≒20,113GHz, τf ≒＋31.42 ppm/oC were obtained for 1250oC/6h sintering ZT. The main phase similar to α-Zn2TiO4 accompanied by TiO2 (rutile) formed in ZMT (Zn0.93Mg0.07TiO3) ceramic. The optimum density and shrinkage were 4.91 g/cm3 and 15.99%, respectively. εr＝28.92, Q×f≒20,314GHz, τf ≒＋35.22 ppm/oC were obtained for 1150oC/6h sintering ZMT.

並列關鍵字

ZnTiO3 ； Zn0.5Ti0.5NbO4

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