期刊
CERAMICS INTERNATIONAL
卷 48, 期 1, 页码 784-794出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2021.09.159
关键词
KSrPO4; Rietveld refinement; LTCC; Chemical bond theory
资金
- National Natural Science Foundation of China [51972143]
- State Key Laboratory of New Ceramic and Fine Processing Tsinghua University [KFZD202101]
A new type of microwave dielectric ceramics, KSrPO4, with low dielectric loss was fabricated through a traditional solid-phase method. The ceramics exhibited excellent microwave dielectric properties, suitable for use in LTCC devices. The internal parameters of KSrPO4 ceramics were calculated based on complex chemical bond theory, and their effects on properties were systematically analyzed.
A new type of microwave dielectric ceramics with low dielectric loss was fabricated through a traditional solidphase method. X-ray diffraction and density tests showed that KSrPO4 ceramics with a single orthorhombic phase could be synthesized and densified at 950 degrees C, and the crystal structure of KSrPO4 was further confirmed by Rietveld refinement analysis. The densification temperature of KSrPO4 was lower than 961 degrees C, indicating the ceramics could be used in LTCC devices. Additionally, based on the complex chemical bond theory, some internal parameters of KSrPO4 ceramics were calculated and the effects of these parameters on the properties of KSrPO4 were systematically analyzed for the first time. Furthermore, the composite dielectric constant and loss of KSrPO4 ceramics were analyzed by infrared reflectance spectroscopy, and the theoretical loss and the actual loss were compared. Finally, a vector network analyzer was employed to measure the microwave dielectric properties of all samples. The results showed that KSrPO4 sintered at 950 degrees C obtain the best microwave dielectric properties, including epsilon r = 7.85, Q.f = 34,527 GHz (at 10.43 GHz) and tau f = -14.82 ppm/degrees C.
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