New high temperature dielectrics: Bi-free tungsten bronze ceramics with stable permittivity over a very wide temperature range.

High relative permittivity, ε r , 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 Sr 2 NaNb 5 O 15 with Ca2+, Y3+ and Zr4+ ions, according to the formulation Sr 2−2z Ca z Y z NaNb 5-z Zr z O 15. For sample composition z = 0.025, ε r 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. [ABSTRACT FROM AUTHOR]