In this study, SrZrO 3 doped K 0.5 Na 0.5 NbO 3 ceramics with Cu, Sn, and Mn as sintering aid are prepared to modulate the temperature stability by conventional solid-state sintering, and samples are denoted as KNNC-100xSZ, KNNS-100xSZ, and KNNM-100xSZ, respectively, where x is the doping amount. The average grain size of the KNNC-12.75SZ sample was ~150 nm. The dielectric constant of KNNC-13.00SZ was 2072 and its dielectric loss was 1.8% at room temperature, with a wide temperature stability range from −55°C to 220°C satisfying the X9R criteria. The discharge energy density of KNNC-12.75SZ reached 1.47 J/cm 3 at room temperature; therefore, the modified KNN is a promising candidate for X9R dielectrics with a fine grain structure and potential anti-reduction capability due to the absence of variable valence elements. The modified KNN can also be applied to energy storage capacitors subjected to high working temperatures.
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