CaO–B2O3–SiO2 (CBS) glass-ceramics containing ZrO2 were prepared by conventional melting and heat treated crystallization method. The effects of ZrO2 on the crystallization behavior, sintering characterization and dielectric properties of the glass-ceramics were analyzed respectively. The results indicated that ZrO2 addition can improve the crystallization and densification of CBS glass-ceramics. The major crystallized phase of sample with≥7wt% ZrO2 was cyclowollastonite (α-CaSiO3).It is found that the optimal sintering condition for the glass-ceramics is 770 oC for 30min. CBS glass ceramics sample with 7wt% ZrO2 shows the best sintering characterization and dielectric properties (ρ= 2.71g/cm3, εr ≈8.8,tan δ=2.36×10-3 at 1 MHz), which is supposed to be suitable for LTCC application.

In this work, an alternative approach to synthesize (K,Na)NbO3 (KNN) particles is investigated. KNN hydrate particles were prepared by hydrothermal method in a mixed alkaline solution with different KOH/(KOH+NaOH) ratios , and phase structure as well as surface morphology of these niobate hydrate particles were systematically studied. For the reaction rate of Na+ is faster than K+, a mixed alkaline solution with K+/Na+ changing from 4/1 to 5/1was required as a starting solution so a to obtain KNN hydrate particles with K/Na=1. Besides, the results show that particle size of KNN hydrate particles synthesized in different starting solution is dependent on K+/Na+ of the starting solution, and grain size of as-sintered KNN ceramics through hydrothermal method decreases sharply.