A new composition was developed using sintering to improve the dielectric properties of low-temperature co-fired alumina (LTCA) containing CuO–TiO₂–Nb₂O₅–Ag₂O. By substituting some alumina with rutile TiO₂, the second-phase compound could be changed from AgNbO₃ to the rutile phase. Further, low-temperature sintering at temperatures below 960 °C was possible, suppressing Al₂TiO₅ formation during firing. The dielectric characteristics, particularly the temperature coefficient of the resonant frequency (τ_f) and Q × f values, were improved without significantly reducing the sinterability and thermal conductivity. The dielectric properties of the developed 88Al₂O₃–12TiO₂-based ceramic were ε_r: 14.7, τ_f: +0.8 ppm/K, and Q × f: 13,383 GHz (at ∼10 GHz) at a firing temperature of 940 °C. The thermal conductivity was 18.5 W/mK, which is the highest value for reported temperature-stable low-temperature co-fired ceramics (LTCCs). These results provide one of the key technologies for the practical application of LTCCs with superior thermal conductivities.

通过烧结开发了一种新的成分，以改善含CuO-TiO ₂ -Nb ₂ O ₅ -Ag ₂ O的低温共烧氧化铝（LTCA）的介电性能。通过用金红石TiO ₂代替某些氧化铝，第二种相化合物可以从AgNbO ₃变为金红石相。此外，可以在低于960℃的温度下进行低温烧结，从而抑制了烧成过程中Al ₂ TiO _5的形成。介电特性，特别是谐振频率的温度系数（τ _˚F）和Q×˚F在不显着降低烧结性和热导率的情况下改善了该值。发达88Al的介电性质₂ ö ₃ -12TiO ₂系陶瓷为ε _{- [R}：14.7，τ _˚F：0.8 PPM / K，和Q×˚F在940的烧成温度下13383千兆赫（在〜10千兆赫）： ℃。导热系数为18.5 W / mK，是所报道的温度稳定的低温共烧陶瓷（LTCC）的最高值。这些结果为具有优异导热性的LTCC的实际应用提供了关键技术之一。