New high temperature dielectrics: Bi-free tungsten bronze ceramics with stable permittivity over a very wide temperature range. Issue 6 (June 2021) - Brown, Thomas
Abstract: High relative permittivity, εr, over a very wide temperature range, −65 °C to 325 °C, is presented for ceramics designed to be compatible with base metal electrode multilayer capacitor manufacturing processes. We report a ≥ 300 °C potential Class II capacitor material, free from Bi or Pb ions, developed by doping Sr2 NaNb5 O15 with Ca 2+, Y 3+ and Zr 4+ ions, according to the formulation Sr2−2z Caz Yz NaNb5-z Zrz O15 . For sample composition z = 0.025, εr values are 1565 ± 15 % (1 kHz) from −65 °C to 325 °C. At a slightly higher level of doping, z = 0.05, ε r values are 1310 ± 10 % from −65 °C to 300 °C. Values of the dielectric loss tangent, tanδ are ≤ 0.025 from −60 °C to 290 °C, for z = 0.025, with tanδ increasing to 0.035 at 325 °C. Microstructural analyses exclude core-shell mechanisms being responsible for the flattening of the ε r –T response.