Sintering, Microstructure, and Dielectric Properties of Copper Borates for High Frequency LTCC Applications

New ceramic materials based on two copper borates, CuB2O4 and Cu3B2O6, were prepared via solid state synthesis and sintering, and characterized as promising candidates for low dielectric permittivity substrates for very high frequency circuits. The sintering behavior, composition, microstructure, an...

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Bibliographic Details
Published in:Materials 2021-07, Vol.14 (14), p.4017
Main Authors: Szwagierczak, Dorota, Synkiewicz-Musialska, Beata, Kulawik, Jan, Pałka, Norbert
Format: Article
Language:English
Subjects:
Borates
Ceramics
Copper
Dielectric loss
Dielectric properties
Frequency ranges
Low temperature
Microstructure
Permittivity
Polyvinyl alcohol
Scanning electron microscopy
Sintering
Spectrum analysis
Substrates
Temperature
Very high frequencies
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Summary:New ceramic materials based on two copper borates, CuB2O4 and Cu3B2O6, were prepared via solid state synthesis and sintering, and characterized as promising candidates for low dielectric permittivity substrates for very high frequency circuits. The sintering behavior, composition, microstructure, and dielectric properties of the ceramics were investigated using a heating microscope, X-ray diffractometry, scanning electron microscopy, energy dispersive spectroscopy, and terahertz time domain spectroscopy. The studies revealed a low dielectric permittivity of 5.1–6.7 and low dielectric loss in the frequency range 0.14–0.7 THz. The copper borate-based materials, owing to a low sintering temperature of 900–960 °C, are suitable for LTCC (low temperature cofired ceramics) applications.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma14144017