BCZT无铅压电陶瓷的铁电相变

发布时间：2018-03-04 22:10

本文选题：无机非金属材料　切入点：无铅压电陶瓷　出处：《材料研究学报》2017年04期 　论文类型：期刊论文

【摘要】：根据升温拉曼光谱和电学性能的变化研究了(Ba_(0.84)Ca_(0.15)Sr_(0.01))(Ti_(0.90)Zr_(0.09)Sn_(0.01))O_3(BCSTZS)陶瓷的铁电相变。BCSTZS陶瓷的拉曼模分为v_3(LO),v_3(TO),v_4(LO),v_2(LO,TO),v_1(TO)和v_1(LO)模。v_3(LO)和v_4(LO)模在升温至80℃后消失,表明BCSTZS的相结构从四方铁电相转变为立方顺电相。v_3(TO),v_2(LO,TO),v_1(TO)和v_1(LO)拉曼模的峰强和峰宽在室温和80℃附近出现明显的异常变化,表明在这两个温度点附近分别发生正交-四方和四方-立方铁电相变。BCSTZS陶瓷在高于居里温度(TC)时仍然存在拉曼峰,表明其内部存在极性微区。随着温度的升高谐振频率(f_r)和反谐振频率(f_a)互相接近,f_a在TC附近出现不连续变化,而应变和逆压电系数 d_(33)*( d_(33)*=S_(max)/E_(max))值随着温度的升高而逐渐降低,进一步证明发生了铁电相变。
[Abstract]:Based on the changes in temperature Raman spectra and electrical properties, a study was made of the ferroelectric phase transition of BaShe 0.84CaT 0.15s / s / s / s / titig / titig / 0.90 / 0.90 SnP / P / T / 0 / 0 / 0 / 0 / 0 / 0 / 0 / 01 / S / C / C / C / C / C / C / C / C / T / T / T / T / T / T / T / T / T / T / T / T / T / T / T / T / T / T / C / T / T / T / T / T / T / T / C / C / T / T / T / T / T / C / T / T / C / T / T / T / T / T / T / C / C / C / T / T / T / T / T / T / T / T / T / T / T / T / T / T / T / T / T / C / C / C / T /. The results show that the phase structure of BCSTZS is changed from tetragonal ferroelectric phase to cubic paraelectric phase. It is shown that Raman peaks still exist in the vicinity of these two temperature points when the quadrature tetragonal and tetragonal cubic ferroelectric phase transition. BCSTZS ceramics are higher than Curie temperature (TC). It shows that there is a polar microregion inside. With the increase of temperature, the resonant frequency f _ S _ r) and the anti-resonance frequency are close to each other. There is a discontinuous variation in the vicinity of TC, while the values of strain and inverse piezoelectric coefficient d _ T _ 3 ~ (33) (d _ T _ (33) / S _ S _ S _ S _ S _ S _ max / E _ S _ I _ max) gradually decrease with the increase of temperature. It is further proved that the ferroelectric phase transition occurs.
【作者单位】：常州大学材料科学与工程学院江苏省光伏科学与工程协同创新中心;上海师范大学物理系上海师范大学光电材料与器件重点实验室;中国科学院无机功能材料与器件重点实验室;
【基金】：国家自然科学基金(51577015,11304333) 江苏省产学研合作前瞻性联合研究项目(BY2014037-06) 江苏省高校自然科学研究重大项目(15KJA43002) 江苏高校优势学科建设工程项目~~
【分类号】：TM282

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