Abstract
Effects of 3ZnO·2B 2 O 3 (3Z2B) glass addition on densification and microwave properties of (Ca 1-x Nd 2x/3 TiO 3 (CNT-X) have been investigated. With the 3Z2B glass content greater than 20 vol%, the densification temperature can be greatly reduced from 1400°C for pure CNT-X to 850°-900°C for CNT-X + 3Z2B microwave ceramics. The above result is attributed to a chemical reaction taking place at the interface of 3Z2B/CNT-X during firing. The Ca in CNT-X dissolves into 3Z2B, forming a new glass of CaO-ZnO-B 2 O 3 at 870°-880°C which enhances the densification kinetics of 3Z2B + CNT-X microwave ceramics. For the samples with 20-40 vol% 3Z2B, the resulting 3Z2B + CNT-X microwave ceramics have a dielectric constant (k) of 30-60 and a quality factor (Q) of 200-550 at 1-10 GHz, and a temperature coefficient of resonant frequency of 20-60 ppm/K in the temperature range of 20°-80°C.