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Research Article | Open Access

Microwave dielectric properties of Ca0.7Nd0.2TiO3 ceramic-filled CaO-B2O3-SiO2 glass for LTCC applications

Hsing-I HSIANGa(), Chih-Cheng CHENb, Sue-Yu YANGa
Department of Resources Engineering, "National Cheng Kung University", Tainan, Taiwan 70101, China
Department of Mechanical Engineering, Far East University, Tainan, Taiwan 74448, China
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Abstract

The effects of the Ca0.7Nd0.2TiO3 ceramic addition on the crystallization, densification, and dielectric properties of CaO-B2O3-SiO2-(Al2O3) glass (C1: CaO-B2O3-SiO2 glass and C1A03: CaO-B2O3-SiO2-Al2O3 glass) for low-temperature co-fired ceramic (LTCC) applications are investigated. The cristobalite phase crystallized from C1 glass was inhibited by adding Al2O3. During sintering, Ca0.7Nd0.2TiO3 ceramic reacted with CaO-B2O3-SiO2-(Al2O3) glass to form the sphene (CaTiSiO5) phase. The amount of sphene phase increases with increasing sintering temperature. By adding 50-60 wt% C1 or C1A03 glass, Ca0.7Nd0.2TiO3 can be densified at 850-900 ℃. The relative dielectric constants for Ca0.7Nd0.2TiO3 added with C1 and C1A03 glasses were all 20-23. Ca0.7Nd0.2TiO3 added with C1 glass exhibited a lower dielectric constant than C1A03 glass due to cristobalite phase formation. For Ca0.7Nd0.2TiO3 ceramics added with 50 wt% glass, the variation in Q × f value presented the same trend as the sphene formation amount variation. The best Q × f value of 2380 GHz was achieved for Ca0.7Nd0.2TiO3 ceramics added with 50 wt% C1A03 glass sintered at 900 ℃ due to the dense structure and greater amount of sphene. Ca0.7Nd0.2TiO3 ceramics added with 50 wt% C1A03 glass sintered at 900 ℃ exhibited a dielectric constant of 22.8 and Q × f value of 2380 GHz, which are suitable for microwave LTCC applications.

Keywords

low-temperature co-fired ceramic (LTCC)Ca0.7Nd0.2TiO3 ceramicsmicrowave dielectric propertyCaO-B2O3-SiO2 glass

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Journal of Advanced Ceramics
Volume 8 Issue 3,
September 2019
Pages 345-351
DOI: 10.1007/s40145-019-0316-6
Cite this article:
HSIANG H-I, CHEN C-C, YANG S-Y. Microwave dielectric properties of Ca0.7Nd0.2TiO3 ceramic-filled CaO-B2O3-SiO2 glass for LTCC applications. Journal of Advanced Ceramics, 2019, 8(3): 345-351. https://doi.org/10.1007/s40145-019-0316-6
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10.1007/s40145-019-0316-6.T001Glass compositions of C1 and C1A03 (Unit: mol%)

GlassSiO2B2O3CaOAl2O3MgONa2OK2O
C163.4418.129.06—3.013.173.17
C1A0361.7617.648.822.642.933.092.93

10.1007/s40145-019-0316-6.T002Q × f values (at 7 GHz) of Ca0.7Nd0.2TiO3 added with C1 and C1A03 glasses after sintering at 850 and 900 ℃

GlassGlass addition (wt%)Sintering temperature (℃)Q × f (GHz)
C140850820
900610
C1A0340850780
900775
C1508501800
9002100
C1A03508501700
9002380