The physical and microwave dielectric properties of the new Zr1-x(Zn1/3Ta2/3)(x) TiO4 (0.2 less than or equal to x less than or equal to 0.6) systems have been investigated as a function of the amount of Zn1/3Ta2/3O2 Substitution. Without sintering aids, Zr1-x(Zn1/3Ta2/3)(x) TiO4 was sintered well at 1300 degreesC, compared to the ZrTiO4. Dielectric constant (K) showed nearly same value below x = 0.35 and increased with increasing amount of Zn1/3Ta2/3O2 contents above x = 0.40. Zr1-x(Zn1/3Ta2/3)(x) TiO4 materials have excellent microwave dielectric properties with K = 42.5, Qf(0) = 40,200 and temperature coefficient of resonant frequency (TCF) = 1.1 ppm/degreesC at x = 0.3. (C) 2002 Elsevier Science B.V. All rights reserved.