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標題Title: The Effect of Sm2O3 Content on Crystal Structure and Microwave Dielectric Characteristics of BiNbO4 Ceramics
作者Authors: 鄭建民,Wen-Cheng Tzou..等
上傳單位Department: 電子工程系
上傳時間Date: 2009-11-22
上傳者Author: 鄭建民
審核單位Department: 電子工程系
審核老師Teacher: 鄭建民
檔案類型Categories: 論文Thesis
關鍵詞Keyword: X-ray diffraction,crystal growth,microwave dielectric characteristics
摘要Abstract: With the addition of 0.5wt% V2O5, the (Bi1-xSmx)NbO4 (x= 0.05, 0.10, and 0.15) ceramics can be densified around 920oC. As the sintering temperatures increase from 920oC to 1020oC, the crystal phases of (Bi1-xSmx)NbO4 ceramics change from the α(orthorhombic)-phase to the β(triclinic)-phase. As x increases from 0.05 to 0.15, the temperature for the α-(Bi1-xSmx)NbO4 phase to disappear is shifted from 1000oC to 980oC and the temperature for the β-(Bi1-xSmx)NbO4 phase to appear is shifted from 960oC to 940oC. The saturated dielectric constants (r) of (Bi1-xSmx)NbO4 ceramics show no apparent change with the increase of sintering temperatures. The saturated quality values (QXf) first increase, reach a maximum at 1000oC~ 1020oC, then slightly decrease with the increase of sintering temperatures. And we will show that the sintering temperatures also have large influence on temperature coefficients of resonant frequency (τf).

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