| 摘要 |
PROBLEM TO BE SOLVED: To provide such a dielectric ceramic compsn. for microwaves having excellent dielectric const. (ε) characteristics and high Q-value that the temp. coefft. of the resonance frequency can be easily controlled and that the compsn. is suitable for a dielectric resonator material and its frequency controlling rod. SOLUTION: This dielectric ceramic compsn. for microwaves is obtd. in the following processes. A BaO-TiO2 -(Nd,Sm)2 O3 ceramic material is prepared by determining the compsn. of BaO, TiO2 , Nd2 O3 , Sm2 O3 so as to obtain the max. Q-value and >=80 dielectric const. Then part of Nd2 O3 in the BaO- TiO2 -(Nd,Sm)2 O3 ceramic is replaced by La2 O3 or CeO2 or Pr6 O11 , Gd2 O3 , and further part of Nd2 O3 is replaced by Eu2 O3 . Thus, the obtd. compsn. has a high Q-value and realizes easy controlling of the temp. characteristics of frequencies. |
