Lead-free Ba_0.85Ca_0.15Zr_0.1Ti_0.9O₃ (BCZT) powders were successfully synthesized by sol–gel-hydrothermal method. The effect of NaOH concentration on microstructure and phase composition of BCZT powders was studied. The results of XRD, SEM, TEM, FTIR, and EDS showed that the synthesis temperature of BCZT powders could be decreased to a low temperature of 180 °C, which was about 1150 °C lower when compared with solid-state reaction and 800 °C lower when compared with sol–gel methods respectively. The NaOH concentration exerted a great effect on the structure of BCZT powders, as well as the average particle size. When the NaOH concentration was 8 M, BCZT powders had a cubic phase perovskite structure with a homogeneous composition, and the average particle size was about 60 nm. The BCZT ceramics followed by sintering had dense structure and excellent electrical properties (2P_r = 24.62 μC/cm², 2E_c = 3.24 kV/cm, d₃₃ = 488 pC/N). The significant properties could be attributed to the high activity of powders synthesized by sol–gel-hydrothermal method. The present study may provide a new method for low-temperature synthesis of lead-free piezoelectric powders with fine phase, microscopic morphology, and high activity.

无铅Ba _0.85 Ca _0.15 Zr _0.1 Ti _0.9 O ₃（BCZT）粉末是通过溶胶-凝胶-水热法成功合成的。研究了NaOH浓度对BCZT粉末组织和相组成的影响。XRD，SEM，TEM，FTIR和EDS的结果表明BCZT粉末的合成温度可以降低到180°C的低温，与固态反应和800°C相比，降低了约1150°C。分别与溶胶-凝胶法相比，C低。NaOH浓度对BCZT粉末的结构以及平均粒径有很大影响。当NaOH浓度为8M时，BCZT粉末具有具有均匀组成的立方相钙钛矿结构，并且平均粒径为约60nm。BCZT陶瓷随后烧结具有致密的结构和优异的电性能（2P _{- [R}  = 24.62μC/厘米²，2 ë _ç  = 3.24千伏/厘米，d ₃₃  = 488 PC / N）。显着的特性可以归因于通过溶胶-凝胶-水热法合成的粉末的高活性。本研究为低温合成无铅压电粉末具有细相，微观形貌和高活性提供了一种新方法。