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Development of Low Cost (Sr,Ca)3Al2O6 Dielectrics for Bi2Sr2CaCu2O8+δ Applications



T J. Haugan, Winnie K. Wong-Ng, Lawrence P. Cook, Richard G. Geyer, H J. Brown, L Swartzendruber, James A. Kaduk


The development of low-cost (Sr,Ca)3Al2O6 dielectrics for Bi2Sr2CaCu2O8+d superconductor applications was investigated. The (Sr,Ca)3Al2O6 phase was determined to be inert to Bi2Sr2CaCu2O8+d with extended high temperature subsolidus annealing, and also during non-equilibrium melting conditions. Addition of up to 25 volume % of (Sr,Ca)3Al2O6 to Bi2Sr2CaCu2O8+d powders had small or neglible effect on the Tc and superconducting volume percentage of the 2212 phase. The dielectric properties of (Sr = 1.0 to 2.5) members of solid-solution (Sr,Ca)3Al2O6 were measured at 77 K and 300 K in the range of 10 to 11 Ghz for cylindrical samples using resonant system methods. The dielectric constant er was from 9.7 to 13.2, and the loss tangent tan(d) was 3 x10-4 to 8 x 10-4.
IEEE Transactions on Applied Superconductivity
No. 1


(Sr, Ca)<sub>3</sub>Al<sub>2</sub>O<sub>6</sub>, Bi<sub>2</sub>Sr<sub>2</sub>CaCu<sub>2</sub>O<sub>8+&#948;</sub>, dielectric constant and loss tangent, phase compatibility


Haugan, T. , Wong-Ng, W. , Cook, L. , Geyer, R. , Brown, H. , Swartzendruber, L. and A., J. (2001), Development of Low Cost (Sr,Ca)<sub>3</sub>Al<sub>2</sub>O<sub>6</sub> Dielectrics for Bi<sub>2</sub>Sr<sub>2</sub>CaCu<sub>2</sub>O<sub>8+&#948;</sub> Applications, IEEE Transactions on Applied Superconductivity (Accessed December 5, 2023)
Created March 1, 2001, Updated February 19, 2017