Abstract—A series of ANb₂O₆ (A=Ca, Mg, Cu, Ni) columbites and 50% Ni doped with CaNb₂O₆,MgNb₂O₆ and CuNb₂O₆ ha s been prepared using sol-gel technique. The samples were sintered at 9000C for 6 hours. Structural characterization of the prepared samples has been done using X-ray diffraction (XRD) method. To study their applicability in low temperature cofired ceramic (LTCC) technology, dielectric and thermal properties have been characterized. Microwave dielectric properties like dielectric constant and Qf values over Ku-band for all the compositions have been measured. Dielectric constant was found to fall between 4.8 to 10. Thermal properties like thermal conductivity and thermal coefficient of expansion (TCE) were measured over a temperature range from room temperature to 900 0C. Thermal conductivity was found to be of the order of 1-2 W/m 0K while TCE was of the order of 5-10 x 10-6/0C. TCE of some of the compositions have shown negative value at 900 0C.

Index Terms—Ltcc, sol-gel, dielectric constant, niobates, ku-band, thermal conductivity, thermal coefficient of expansion.

Jyotirmayee Satapathy and M. V. Rama na Reddy are with department of physics, Osmania university, Hyderabad.

Cite: Jy otirmayee Satapathy and M. V. Ramana Reddy, "Dielectric and Thermal Studies of ANb₂O₆ (A=Ca, Mg, Cu, Ni) for LTCC Application," International Journal of Applied Physics and Mathematics  vol. 1, no. 3, pp. 181-184, 2011.