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首页> 外文期刊>CERAMICS INTERNATIONAL >Structural, dielectric, piezoelectric, ferroelectric and electro-caloric properties of Ba1-xCaxTi0.975(Nb0.5Yb0.5)(0.025)O-3 lead-free ceramics
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Structural, dielectric, piezoelectric, ferroelectric and electro-caloric properties of Ba1-xCaxTi0.975(Nb0.5Yb0.5)(0.025)O-3 lead-free ceramics

机译：Ba1-XcaxTi0.975（NB0.5YB0.5）（0.025）O-3无铅陶瓷的结构，电介质，压电，铁电和电热电热和电热电环化合物

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摘要

Polycrystalline samples of Ba1-xCaxTi0.975(Nb0.5Yb0.5)(0.025)O-3 (where x = 0.15, 0.2 and 0.3, abbreviated as BCTYN) were prepared by the conventional solid state reaction method. The effect of calcium (Ca) substitution in BaTi0.975(Nb0.5Yb0.5)(0.025)O-3 (abbreviated as BTYN25) on the structural, dielectric, piezoelectric and ferroelectric properties and electro-caloric effects (ECE) was investigated. X-ray diffraction (XRD) results at room temperature showed that the BCTYN samples in the composition x 0.3 exhibited a pure tetragonal perovskite structure. Dielectric measurements showed a classical ferroelectric behavior for all samples. With the increase of the Ca content, the Curie temperature (T-C) was still maintained with a small shift towards low temperature. The evolution of the Raman spectra was studied as a function of compositions and temperatures. The Raman bands confirmed the structure and the phase transition of the BCTYN ceramics. By adding Ca, the piezoelectric properties and the remanent polarization (P-r) are relatively maintained for the compositions x = 0.15 and x = 0.2. A piezoelectric coefficient of d(33) = 130 pC/N and a planar electromechanical coupling factor of k(p) = 28% were obtained for these compositions. Two different methods were used to calculate the electro-caloric coefficients of the BCTYN ceramics. The incorporation of Ca was found to enhance the electro-caloric strength (xi = Delta T/Delta E) within a broad temperature range with a best value of xi = 0.2 Kmm/kV for x = 0.2.
机译：通过常规固态反应方法制备了Ba1-XcaxTi0.975（NB0.5yB0.5）（0.025）O-3（0.025）O-3的多晶样品（0.025）O-3（其中X = 0.15,0.2和0.3）。研究了钙（CA）取代在BTI0.975（NB0.5YB0.5）（0.025）O-3（0.025）O-3（缩写为BTYN25）的影响，研究了结构，电介质，压电和铁电性能和电热效应（ECE） 。在室温下X射线衍射（XRD）结果显示组合物X＆LT; 0.3表现出纯四方钙钛矿结构。介电测量显示所有样品的经典铁电行为。随着Ca含量的增加，居里温度（T-C）仍保持朝向低温的小转变。研究了拉曼光谱的演变作为组合物和温度的函数。拉曼带确认了BCTYN陶瓷的结构和相位过渡。通过添加Ca，对于组合物x = 0.15和x = 0.2，相对保持压电性能和再搅拌极化（P-R）。为这些组合物获得了D（33）= 130pc / n的压电系数和K（p）= 28％的平面机电耦合因子。使用两种不同的方法来计算BCTYN陶瓷的电热量系数。发现Ca的掺入在宽温度范围内增强电热量强度（Xi = Delta T / Delta E），最佳值Xi = 0.2 kmm / kV用于X = 0.2。

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