Composition design, electrical properties, and temperature stability in (1 - x )K 0.44 Na 0.56 Nb 0.96 Sb 0.04 O 3 - x Bi 0.45 La 0.05 Na 0.5 ZrO 3 lead-free ceramics.

In this work, we designed a new system of (1 - x )K 0.44 Na 0.56 Nb 0.96 Sb 0.04 O 3 - x Bi 0.45 La 0.05 Na 0.5 ZrO 3 (KNNS- x BLNZ, 0 ≤ x ≤ 0.06) ceramics, and systemically investigated both their electrical performance and temperature stability. Through optimizing the composition, a relatively good comprehensive performance ( e.g. , d 33 ∼ 455 ± 10 pC N -1 , k p ∼ 0.47 ± 0.02, T C ∼ 266 °C, strain ∼ 0.148%, and ) is obtained in the ceramics with x = 0.040, which is attributed to the construction of a rhombohedral-orthorhombic-tetragonal (R-O-T) phase boundary. Moreover, a good temperature stability of remnant polarization ( P r ) as well as strain value ( P r100 °C / P rRT ∼ 89.6%, P r180 °C / P rRT ∼ 73.2%, S 100 °C / S RT ∼ 92.6%, S 180 °C / S RT ∼ 74.1%) is gained in KNNS-0.040BLNZ ceramics with a broad temperature range from room temperature to 180 °C. Hence, we believe that KNNS- x BLNZ ceramics opens a window for the practical application of lead-free ceramics.