The effect of sintering condition on structure, microstructure, and ferroelectric properties ([Formula: see text][Formula: text] text]- O 3 (KNL–NTS) has been investigated. Ceramic powders have synthesized by the solid-state reaction method sintered at different temperatures (1115[Formula: text]C, 1125[Formula: 1140[Formula: text]C). Then, samples were characterized thermogravimetric analysis, ...