Sameera Devi Ch, Kumar G S, Prasad G
Materials Research Laboratory, Department of Physics, Osmania University, Hyderabad 500 007, India.
Materials Research Laboratory, Department of Physics, Osmania University, Hyderabad 500 007, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2015 Feb 5;136 Pt B:366-72. doi: 10.1016/j.saa.2014.09.042. Epub 2014 Sep 28.
Lead free ferroelectric ceramics in the form of Ba(1-3x)Nd(2x)Ti(1-y)ZryO3 ((where x=0.025, y=0 (BT1), 0.025 (BT2), 0.05 (BT3)) were prepared using sol-gel method. The surface morphology and the orientation of grains of the present ceramics were examined using Field Emission Scanning Electron Microscope (FESEM) images. The effect of Nd(3+), Zr(4+) ions content on the BaTiO3 was studied using Raman and Fourier Transform Infrared (FTIR) spectroscopies. From the Raman analysis the band observed at ∼838 cm(-1) was attributed due to the presence of Nd(3+)-barium vacancy pairs. The FTIR studies suggested that the addition of Nd(3+) ions in A-site of BaTiO3 (ABO3) perovskite create lattice distortion by forming A-site vacancies and Zr(4+) ions in B-site of BaTiO3 induce the lattice distortion by forming ZrO6 octahedra in the place of TiO6 octahedra. Dielectric measurements of the samples were done at different frequencies from RT-150°C. Charge transportation phenomenon is explained using DC conductivity, which is found to increase with temperature.
采用溶胶 - 凝胶法制备了Ba(1 - 3x)Nd(2x)Ti(1 - y)Zr y O3（其中x = 0.025，y = 0（BT1），0.025（BT2），0.05（BT3））形式的无铅铁电陶瓷。使用场发射扫描电子显微镜（FESEM）图像检查了当前陶瓷的表面形态和晶粒取向。使用拉曼光谱和傅里叶变换红外（FTIR）光谱研究了Nd(3 +)、Zr(4 +)离子含量对BaTiO3的影响。通过拉曼分析，在~838 cm(-1)处观察到的谱带归因于Nd(3 +)-钡空位对的存在。FTIR研究表明，在BaTiO3（ABO3）钙钛矿的A位添加Nd(3 +)离子通过形成A位空位产生晶格畸变，而在BaTiO3的B位添加Zr(4 +)离子通过形成ZrO6八面体代替TiO6八面体诱导晶格畸变。在室温至150°C的不同频率下对样品进行了介电测量。使用直流电导率解释了电荷传输现象，发现其随温度升高而增加。
