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摘要:通過化學(xué)沉積方法在鋯鈦酸鉛鑭Pb1-1.5xLax(Zr0.58Ti0.42)1-1.25yNbyO3(x=0.06，y=0.02；PLZT)陶瓷顆粒表面包覆低熔點化合物氟化鋰LiF和氟化鉛PbF2(摩爾比1:1；PLF)，用傳統(tǒng)固相燒結(jié)工藝制備了PLZT鐵電陶瓷。研究了摻雜氟化物含量以及燒結(jié)工藝條件對PLZT陶瓷的晶相結(jié)構(gòu)、微觀形貌、介電、壓電和鐵電性能的影響。摻雜后PLZT陶瓷保持了較純凈的鈣鈦礦結(jié)構(gòu)，陶瓷晶粒分布均勻。摻有6wt%-8wt%氟化物的PLZT陶瓷在1000℃-1100℃下燒結(jié)1小時能致密化，高溫下氟化物玻璃相有擴散到PLZT主晶相的趨勢。摻PLF6wt%的PLZT陶瓷在1100℃下燒結(jié)1小時的壓電常數(shù)d33，機電耦合系數(shù)Kp，相對介電常數(shù)r，介電損耗tanδ分別為216pC/N，0.49，1980和0.0356。 嘗試了PLZT低溫?zé)Y(jié)陶瓷在制備鐵電/鐵磁復(fù)合陶瓷中的應(yīng)用。采用共燒工藝制備了質(zhì)量比為1:9、2:8、3:7和4:6的鐵酸鈷CFO/PLZT磁電復(fù)合陶瓷。X-射線分析結(jié)果表明：該復(fù)合物中CFO和PLZT兩相共存，相界清晰，無雜相產(chǎn)生。1100℃下燒結(jié)的CFO/PLZT質(zhì)量比為2:8樣品的密度、壓電常數(shù)d33和機電耦合系數(shù)Kp分別為6.51g/cm3、23.8pC/N和0.083。 關(guān)鍵詞：鋯鈦酸鉛鑭陶瓷；低溫?zé)Y(jié)；氟化物；磁電復(fù)合材料；鐵酸鈷
Abstract:The lead lanthanum zirconate titanate Pb0.91La0.06(Zr0.58Ti0.42)0.975Nb0.02O3(PLZT) powders were coated with LiF and PbF2 via a chemical deposition method. Using the LiF and PbF2 (molar ratio 1:1, PLF) as sintering additives, the piezoelectric ceramics (PLZT) were fabricated via conventional solid sintering method. The effects of PLF content and sintering conditions on the phase structure, micro-morphology, dielectric, piezoelectric and ferroelectric properties were investigated. The PLF modified PLZT ceramics present a perovskite structure. The grains show a uniform size. The PLZT ceramics doped with 6-8 wt% PLF can be obtained at the sintering temperature of 1000-1100°C. The glass materials could be absorbed in the main crystalline phase at higher sintering temperature. The piezoelectric constant, electromechanical coupling coefficient, dielectric permittivity and dielectric loss of PLZT with 6wt.% PLF content sintered at 1100℃ for 1 hour were found to be 216 pC/N, 0.49, 1980 and 0.0356, respectively. It was tried to use PLF modified PLZT for fabricating ferroelectric/ferromagnetic composites. The CFO/PLZT composite ceramics with mass ratio of 1:9, 2:8, 3:7 and 4:6 were prepared using co-firing method. The X-ray diffraction patterns showed that two separate CFO and PLZT phases were existed, phase boundaries were clear and almost no other phase were found. The density, piezoelectric constant and electromechanical coupling coefficient of the CFO/PLZT with mass ratio of 2:8 sintered at 1100℃ were found to be 6.51g/cm3, 23.8pC/N and 0.083, respectively. Keywords: PLZT; low-temperature sintering; fluoride ; magneto-electric materials; cobalt ferrite
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