Flame-assisted ultrasonic spray pyrolysis (FAUSP) has been developed to prepare ceramic powders. FAUSP comprises simple and inexpensive equipment and can be operated easily under ambient conditions to form fine particles with a narrow particle-size distribution. The technique allows the use of a wide range of precursors and has been used to prepare zirconia and yttria-stabilized zirconia powders. The powder particles are spherical and dense with a narrow particle-size distribution in the micron or submicron range, depending on the concentration of the precursor solution.