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Ba 0.98 Bi 0.02 (Ti 0.9 Zr 0.1 ) 1−x Cu x O 3 (x = 0, 0.01, 0.02, 0.03 mol) ceramics were prepared by a solid state processing. X-ray diffraction analysis indicates that all of the ceramics samples have tetragonal crystal structure. The dielectric constants as a function of temperature at different frequencies show that all of the ceramics have relaxor behavior. But the dielectric dispersion is weak for x = 0.01 and strong for x = 0 and 0.03. The relaxor characteristics were discussed using random field model and Lorenz formula in BBTZC ceramics.

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