【作者】 陈大任； 李国荣； 张望重；

【Author】 Chen Daren Li guorong Zhang Wangzhong (Laboratory of Functional Inorganic Materials,Shanghai Institute of Ceramics,Chinese Academy of Science,Shanghai,200050,China)

【机构】 中科院上海硅酸盐研究所无机功能材料开放实验室；

【摘要】 对填满钨青铜结构压电陶瓷[Pbx（Ba. Sr）_1-x]₄(Na_0.88Li_0.12)₂Nb₁₀O₃₀（x=0.64）的电场（S）-应变（E）关系进行了研究。结果表明,该陶瓷的S-E线性极为良好,在低电场下不存在钙钛矿型PZT系陶瓷固有的产生不可逆90°畴畴壁转向的阈值场强E_b。分析认为该钨青铜型陶瓷的铁电相为赝正交晶系,属单轴铁电体,不存在90°畴畴壁转向是上述特征的原因。本工作发现该压电陶瓷的S-E关系在～350V/mm较高场强处应变S对电场的斜率(即压电系数d₃₃、d₃₁之值)呈现极微弱的突增（约5%）。分析认为这是与它属赝正交晶系,轴长有微小差异的a、b轴在外场下互换有关。更多还原

【Abstract】 The characterization of strain S with electric field E were studied for[Pbx（Ba.Sr）_1-x]₄(Na_0.88 Li_0.12)₂Nb₁₀O₃₀/x=0.64 piezoelectric ceramic with tungsten bronze structure.There was not a threshold field E_b existed in the curve of S with E,it was shown that no 90°domain wall motion existed in it.At a high electric field E aboud 350V/mm a slight increment in the slope rate of strain S appeared in the curve.Both of the results were related to its pseudo-orthorhombic phase of the tungsten bronze structure.更多还原