(1-x)K_(0.48)Na_(0.52)NbO_3-xBi_(0.45)Nd_(0.05)(Na_(0.92)Li_(0.08))_(0.5)ZrO_3无铅压电陶瓷相结构及压电性能
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摘要
为了在获得较高压电性能的同时又不大大降低陶瓷的居里温度(TC),设计和制备了Bi_(0.45)Nd_(0.05)(Na_(0.92)-Li_(0.08))_(0.5)ZrO_3改性的K_(0.48)Na_(0.52)NbO_3系无铅压电陶瓷((1–x)KNN-xBNNLZ),研究了BNNLZ含量对KNN基无铅压电陶瓷相结构和电学性能的影响。研究结果表明,所有陶瓷样品均具有较高的居里温度T_C(>300℃)。随着BNNLZ含量的增加,陶瓷的正交-四方相变温度(T_(O-T))不断向低温方向移动,而三方–正交相变温度(T_(R-O))不断向高温方向移动,最终在陶瓷中形成了三方–四方(R-T)共存相,R-T共存相处于0.05压电性能:d_(33)=313 pC/N,k_p=42%,P_r=25.48μC/cm~2,ε_r=1353,tanδ=2.5%,T_C=327℃。
To enhance the piezoelectric properties and maintain relatively higher Curie temperature(TC),(1–x)K_(0.48)Na_(0.52)NbO_3-x Bi0.45 Nd_(0.05)(Na_(0.92)Li_(0.08))_(0.5)ZrO_3((1–x)KNN-xBNNLZ) ceramics were prepared by conventional solid-state method.The effects of BNNLZ content on the phase structure and electrical properties of the ceramics were investigated in details.The results show that all ceramic samples exhibit higher T_C(>300℃).With the increase of BNNLZ content,both orthorhombic-tetragonal phase transition temperature(T_(O-T)) and rhombohedral-orthorhombic phase transition temperatures(T_(R-O)) shift to room temperature simultaneously,and finally the R-T phase coexistence is constructed near room temperature in the compositions range of 0.05
To enhance the piezoelectric properties and maintain relatively higher Curie temperature(TC),(1–x)K_(0.48)Na_(0.52)NbO_3-x Bi0.45 Nd_(0.05)(Na_(0.92)Li_(0.08))_(0.5)ZrO_3((1–x)KNN-xBNNLZ) ceramics were prepared by conventional solid-state method.The effects of BNNLZ content on the phase structure and electrical properties of the ceramics were investigated in details.The results show that all ceramic samples exhibit higher T_C(>300℃).With the increase of BNNLZ content,both orthorhombic-tetragonal phase transition temperature(T_(O-T)) and rhombohedral-orthorhombic phase transition temperatures(T_(R-O)) shift to room temperature simultaneously,and finally the R-T phase coexistence is constructed near room temperature in the compositions range of 0.05
引文
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[4]WU J G,XIAO D Q,ZHU J G.Potassium-sodium niobate lead-free piezoelectric materials:past,present,and future of phase boundaries.Chem.Rev.,2015,115(7):2559–2595.
[5]LI Z F,LI Y X,ZHAI J W.Grain growth and piezoelectric property of KNN-based lead-free ceramics.Curr.Appl.Phys.,2011,11(3):S2–S13.
[6]LU Y Q,LI Y X.A review on lead-free piezoelectric ceramics studies in China.J.Adv.Dielect,2011,1(3):269–288.
[7]HAO H F,TAN G Q,REN H J,et al.Hydrothermal-assisted synthesis and sintering of K0.5Na0.5Nb O3-x Li Ta O3 lead-free piezoelectric ceramics.Ceram.Int.,2014,40(7):9485–9491.
[8]HUANG Y Q,DU H W,FENG W,et al.Influence of Sr Zr O3addition on structural and electrical properties of(K0.45Na0.51Li0.04)(Nb0.90Ta0.04Sb0.06)O3 lead-free piezoelectric ceramics.J.Alloys Compd.,2014,590(25):435–439.
[9]WANG H,WU J G,CHENG X J,et al.New phase boundary and piezoelectric properties in(K,Na)Nb O3 based ceramics.J.Alloys Compd.,2014,585(5):748–752.
[10]JIANG M H,LIU X Y,CHEN G H.Phase structures and electrical properties of new lead-free Na0.5K0.5Nb O3-Li Sb O3-Bi Fe O3 ceramics.Scripta Mater.,2009,60(10):909–912.
[11]WANG Z,WU J G,XIAO M,et al.Phase transition and electrical properties of(1–x)K0.5Na0.5Nb O3-x Bi0.5Na0.5Zr0.8Ti0.2O3 lead-free piezoceramics.Ceram.Int.,2014,40(7):9165–9169.
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[13]LIANG W F,WU W J,XIAO D Q,et al.Construction of new morphotropic phase boundary in 0.94(K0.4-xNa0.6BaxNb1-xZrx)O3-0.06-Li Sb O3 lead-free piezoelectric ceramics.J.Mater.Sci.,2011,46(21):6871–6876.
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