The process complexity, limited stability, and distinct synthesis and dispersion steps restrict the usage of multicomponent metal oxide nanodispersions in solution-processed electronics. Herein, sonochemistry is employed for the in situ synthesis and formulation of a colloidal nanodispersion of high-permittivity (κ) multicomponent lanthanum zirconium oxide (LZO: La₂Zr₂O₇). The continuous propagation of intense ultrasound waves in the aqueous medium allows the generation of oxidant species which, on reaction, form nanofragments of crystalline LZO at ∼80 °C. Simultaneously, the presence of acidic byproducts in the vicinity promotes the formulation of a stable as-prepared LZO dispersion. The LZO thin film exhibits a κ of 16, and thin-film transistors (TFTs) based on LZO/indium gallium zinc oxide operate at low input voltages (≤4 V), with the maximum mobility (μ) and on/off ratio (I_on/I_off) of 5.45 ± 0.06 cm² V^-1 s^-1 and ∼10⁵, respectively. TFTs based on the compound dielectric LZO/Al₂O₃ present a marginal reduction in leakage current, along with enhancement in μ (6.16 ± 0.04 cm² V^-1 s^-1) and I_on/I_off (∼10⁵). Additionally, a 3 × 3 array of the proposed TFTs exhibits appreciable performance, with a μ of 3-6 cm² V^-1 s^-1, a threshold voltage of -0.5 to 0.8 V, a subthreshold swing of 0.3-0.6 V dec^-1, and an I_on/I_off of 1-2.5 (×10⁶).

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