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| 折扣與優(yōu)惠：團(tuán)購最低可5折優(yōu)惠 - 了解詳情 | 論文格式：Word格式(*.doc) |  |
摘要：以氧化鉛、氧化鈦、氧化鋯、氧化鑭和氧化鈮為原料，采用傳統(tǒng)的固相合成工藝制備Pb0.9025La0.065(Zr0.58Ti0.42)0.975Nb0.02O3（PLZT）陶瓷粉體。研究了燒結(jié)助劑鎢銅酸鉛（PWC）和鎢酸鋰（LWC）的含量對燒結(jié)溫度、陶瓷的晶相結(jié)構(gòu)、微觀形貌、致密度和電學(xué)性能的影響。結(jié)果表明，燒結(jié)溫度在950℃~1150℃范圍內(nèi)，加入適量的LWC和PWC在燒結(jié)前期形成過渡液相促進(jìn)燒結(jié)；在燒結(jié)后期被主晶相吸收。與LWC摻雜的陶瓷相比，PWC的摻入使得材料的壓電應(yīng)變常數(shù)d33、相對介電常數(shù)εr、機(jī)電耦合系數(shù)Kp較高，但同時(shí)也使得介電損耗tanδ增大；隨著PWC摻入量的增加，材料的d33、Kp和εr 都先增加后減??；而陶瓷相的結(jié)構(gòu)由偽立方相逐漸過渡到四方相。在1100℃燒結(jié)1小時(shí)、含4wt%PWC的樣品，其居里溫度Tc＝230℃，壓電應(yīng)變常數(shù)d33＝311 pC/N，機(jī)電耦合系數(shù)Kp＝0.44，介電常數(shù) εr ＝2389，介電損耗tanδ＝0.04，機(jī)械品質(zhì)因數(shù)Qm=67.7。 關(guān)鍵詞：鋯鈦酸鉛鑭；壓電陶瓷；鎢銅酸鉛；鎢銅酸鋰；低溫?zé)Y(jié)
Abstract:The lead lanthanum zirconate titanate Pb0.9025La0.065(Zr0.58Ti0.42)0.975Nb0.02O3 (PLZT) were prepared via the conventional mixed-oxide technique by using Pb3O4, TiO2, ZrO2, La2O3 and Nb2O5 oxides as raw materials. The effects of sintering additives Li2(W0.5,Cu0.5)O3 (LWC)& Pb(W0.5,Cu0.5)O3 (PWC) content on the sintering temperature, phase structure, micro-morphology, density and electric properties of the ceramic were investigated. The results showed that the LWC & PWC as sintering additives could form liquid phase to improve sintering process in the temperature region of 950 - 1150℃, and finally they were absorbed in the main crystalline phase. Compared with that doped with LCW, the PLZT doped with PWC showed higher piezoelectric constant d33,dielectric permittivity εr and electromechanical coefficient Kp, but they also showed a higher dielectric loss tanδ. As PWC content increased, the d33、εr and Kp firstly increased and then decreased, the crystalline phase changed from fake cubic to tetragonal structure. When the PWC content was 4wt%, the Curie temperature Tc,d33,Kp,εr, tanδ and qulity fator Qm of the samples sintered at 1100℃ were found to be 230℃, 311pC/N, 0.44, 2389, 0.04 and 67.7, respectively. Keywords: PLZT; piezoelectric ceramics; Pb(W0.5,Cu0.5)O3; Li2(W0.5,Cu0.5)O3; low temperature sintering;
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