Effects of CuO additives and sol–gel technique on NiNb2O6 dielectric ceramics for LTCC application

Abstract

The effects of CuO additives and sol-gel method synthesis on the sintering behavior, microstructure and the microwave dielectric properties of NiNb 2 O 6 ceramics were investigated systematically. The NiNb 2 O 6 ceramics were synthesized with traditional solid state method and sol-gel method, and the CuO additives were used in the solid state method for comparison. The sintering temperature of NiNb 2 O 6 ceramics with the highest densification can be effectively reduced from about 1275˚C to 1050˚C and 1100˚C respectively by using CuO additions and sol-gel technique. To study their applicability in low temperature cofired ceramic (LTCC) technology, dielectric properties have been characterized. The dielectric properties exhibited a significant dependence on the sintering condition, composition and crystal structure of the ceramics.In particular, the 2.5 wt.% CuO-doped NiNb 2 O 6 ceramics sintered at 1050˚C have excellent microwave dielectric properties: ε r =21.45, Q׃=23531GHz, τ f =-27.9ppm/˚C. 2While the NiNb 2 O 6 ceramics prepared by sol-gel method obtain microwave dielectric properties as: ε r =19.16, Q׃=11149GHz, τ f =-27.3ppm/˚C after sintered at 1100˚C for 2h.

Correlated barrier charge hopping and non-Debye relaxation in columbite MnNb2O6

“…Due to large requirement and upsurge in the miniaturization of the electronic components in the electrical and mobile/wireless/satellite communication technology there is a need for the materials with high relative-dielectric permittivity (ε r ) and good quality factor (Q). Such requirements can be fulfilled by low cost columbites and their composites, which are treated as novel electronic materials of high ε r with a low-loss factor useful for ceramic resonators and filters [18][19][20]. The Co-based columbite (Ising-spin chain ferromagnet CoNb 2 O 6 ) is quite well-known because it exhibits quantum excitations in the vicinity of the quantum critical point.…”