Low temperature sintering and microwave dielectric properties of Ba3Ti5Nb6O28 with ZnO–B2O3 glass additions for LTCC applications

Abstract The effects of ZnB2O4 glass additions on the sintering temperature and microwave dielectric properties of Ba3Ti5Nb6O28 have been investigated using dilatometer, X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy and a network analyzer. The pure Ba3Ti5Nb6O28 system showed a high sintering temperature (1250 °C) and had the good microwave dielectric properties: Q × f of 10,600 GHz, ɛr of 37.0, τf of −12 ppm/°C. It was found that the addition of ZnB2O4 glass to Ba3Ti5Nb6O28 lowered the sintering temperature from 1250 to 925 °C. The reduced sintering temperature was attributed to the formation of ZnB2O4 liquid phase and B2O3-rich liquid phases. Also the addition of ZnB2O4 glass enhanced the microwave dielectric properties: Q × f of 19,100 GHz, ɛr of 36.6, τf of 5 ppm/°C. From XPS and XRD studies, these phenomena were explained in terms of the reduction of oxygen vacancies and the formation of secondary phases having the good microwave dielectric properties.

[1]  Jenn–Ming Wu,et al.  Microwave properties of zinc, barium and lead borosilicate glasses , 1999 .

[2]  W. Stickle,et al.  Handbook of X-Ray Photoelectron Spectroscopy , 1992 .

[3]  N. Alford,et al.  Microwave Dielectric Loss of Titanium Oxide , 2000 .

[4]  R. Roth,et al.  Phase equilibria and crystal chemistry in the ternary system BaOTiO2Nb2O5, I , 1987 .

[5]  W. F. Peck,et al.  Dielectric properties of barium titanium niobates , 1997 .

[6]  D. Suvorov,et al.  Microstructural phenomena in low-firing ceramics , 2003 .

[7]  T. Negas,et al.  BaTi_4O_2/Ba_2Ti_9O_20-Based Ceramics Resurrected for Modern Microwave Applications , 1993 .

[8]  H. Jung,et al.  Low-temperature sintering and microwave dielectric properties of Ba5Nb4O15 with ZnB2O4 glass , 2006 .

[9]  E. M. Levin,et al.  THE SYSTEM BaO–B2O3* , 1949 .

[10]  M. Sebastian,et al.  Influence of glass additives on the microwave dielectric properties of Ca5Nb2TiO12 ceramics , 2005 .

[11]  M. Sebastian.  New low loss microwave dielectric ceramics in the BaO-TiO2-Nb2O5Ta2O5 system , 1999 .

[12]  S. Nomura,et al.  Effect of Mn Doping on the Dielectric Properties of Ba2Ti9O20 Ceramics at Microwave Frequency , 1983 .

[13]  Ying-Chieh Lee,et al.  Microwave dielectric properties and microstructures of Ba2Ti9O20-based ceramics with 3ZnO–B2O3 addition , 2005 .

[14]  R. Newnham,et al.  Effect of Glass Additions on BaO–TiO2–WO3 Microwave Ceramics , 1994 .

[15]  K. Hong,et al.  Low-temperature firing and microwave dielectric properties of BaTi4O9 with Zn-B-O glass system , 2001 .