The preparation and dielectric properties of dielectric ceramic composites with controllable thermal expansion: SrTiO_3/ZrMgMo_3O_(12)

摘要

Controllable thermal expansion dielectric ceramic of SrTiO_3/ZrMgMo_3O_(12) has been fabricated by solid-state method. The experimental results indicate that the coefficient of thermal expansion (CTE) of the composites could be adjusted from 10.13 ×10~(-6) to 4.06 ×10~(-6) K~(-1). At 10 MHz, dielectric constants of composites are in the range of 40.70-21.17, while dissipation factors changed from 1.17 ×10~(-4) to 79.7 ×10~(-4). The composite wherein the volume fraction of ZrMgMo_3O_(12) was 40%, showed the following excellent properties: low CTE (6.53 ×10~(-6) K~(-1)), moderate dielectric constants (28.95) and low dissipation factor (tanδ, 1.17 ×10~(-4)) at 10 MHz. Therefore, this composite could be used as a high-frequency dielectric ceramic.