A Ba0.75Sr0.25Ti0.95Zr0.05O3 ceramic was developed for use in nonlinear transmission line (NLTL) applications. The sol–gel process was used to synthesize Ba0.75Sr0.25Ti0.95Zr0.05O3 nanoparticles to achieve a uniform composition and a high surface area. Simultaneous thermal gravimetric analysis and differential thermal analysis (TGA/DTA) was used to identify the decomposition sequence as a function of temperature for the as-synthesized powders. The phase transformation was confirmed by X-ray diffraction (XRD). The calcined nanoparticles were hot-pressed at 1300°C to achieve a high density. Microstructures were characterized using scanning electron microscopy (SEM). Several dielectric properties were measured and are reported.