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URN etd-0910116-193024 Statistics This thesis had been viewed 444 times. Download 39 times. Author Jia-min Chen Author's Email Address No Public. Department Materials Engineering Year 2015 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 86 Title EFFECTS OF DOPING Nd, Sm ON THE MICROWAVE DIELECTRIC PROPERTIES OF
Keyword Sm2O3 Nd2O3 Quality factor Apatites Microwave dielectric ceramics solid-state sinte Pr6O11 La2O3 La2O3 Pr6O11 solid-state sinte Microwave dielectric ceramics Apatites Quality factor Nd2O3 Sm2O3 Abstract This study was on the effects of rare-earth doping Nd, Sm on the microwave dielectric properties of solid-state sintered Ca4(La, Pr)6(SiO4)4(PO4)2O2 compound apatites.
In the case of Nd doping, the optimum composition was Ca4(La2Pr2Nd2)(SiO4)4(PO4)2O2. When it was sintered at 1500 oC for 4 hours, its microwave dielectric properties were: quality factor, 28745GHz; dielectric constant,14.15; resonance frequency temperature drift coefficient, 0.86 ppm / oC. Doping small amount of Nd increased the dielectric constant. But too much of Nd decreased dielectric constant. It was desirable to have Nd to replace La instead of Pr. Quality factor and thermal stability would increase if Nd was to replace La.
In the case of Sm doping, the optimum composition was Ca4(La4Sm2)(SiO4)4(PO4)2O2. When it was sintered at 1500 oC for 4 hours, the microwave dielectric properties were: quality factor, 25825GHz; dielectric constant,14.04; resonance frequency temperature drift coefficient, 2.8 ppm / oC. When Sm replaced La, dielectric constant would slightly increase, but the quality factor and thermal stability significantly decrease. When Sm replaced Pr, the quality factor was slightly improved.
Advisor Committee Yung-Jen Lin - advisor
Jiin-Jyh Shyu - co-chair
Sea-Fue Wang - co-chair
Files Date of Defense 2016-07-29 Date of Submission 2016-09-19