a位取代BaTiO3:结构、光学、铁电和介电性质分析

IF 2.4 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
M. Soni, M. Saleem, A. Mishra
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引用次数: 4

摘要

本工作中报道了基于钛酸钡(BaTiO3)的众所周知的铁电和介电材料,其组成式为Ba[式:见正文]AEMxTiO3[式:见正文]和AEM(碱土金属)[式:看正文]Ca和Sr],表示为BTO、BCTO和BSTO。采用固相反应法合成了这些钛酸盐。通过X射线衍射(XRD)、傅立叶变换红外光谱(FTIR)、拉曼非弹性散射、X射线能量色散分析(EDAX)和场发射扫描电子显微镜(FESEM)对合成的样品进行了结构表征。除此之外,还对样品进行了光学带隙、介电常数、介电损耗、交流电导率和极化([公式:见正文]–[公式:参见正文])研究。XRD数据分析表明,所有样品都获得了四方结构(P4mm),并且是单相的。Ba的Rietveld精炼[公式:见正文]Ca[公式:见图正文]TiO3证实了XRD结果。在FTIR光谱中,出现在约400[公式:见正文]cm[公式:见图正文]和500[公式:看正文]cm]的吸收模式是Ti–O键和Ba–O键振动的属性,证实了所需样品的形成。在大约310[公式:见正文]cm[公式:看正文]处出现的拉曼振动模式是四方相的指示。Ba的FESEM显微照片[公式:见正文]Ca的FESEM微观照片[公式:见正文]TiO3显示在约1[公式:见图正文][公式:见文本]m的范围内的晶粒生长,并且其EDAX光谱证实了样品的组成。发现光学带隙分别为3.35[公式:参见文本]eV、3.1[公式:见文本]eV和2.65[公式,参见文本]eV,用于原始的、Ca[公式:请参见文本]-和Sr[公式,请参见文本]掺杂的BaTiO3。与频率相关的电介质研究推断,样品本质上是非常好的电介质,具有非常低的损耗值。在1000下对场的偏振[公式:见正文]V见证了样品表现出具有损耗特性的低偏振效应。在所有报道的钛酸盐中,发现Ba的介电性和[公式:见正文]–[公式:见图正文]行为[Sr[公式:参见正文]TiO3异常。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A-Site Substituted BaTiO3: Analysis of Structural, Optical, Ferroelectric and Dielectric Nature
The well-known ferroelectric and dielectric materials based on barium titanate (BaTiO3) with the compositional formula Ba[Formula: see text]AEMxTiO3 [[Formula: see text] and AEM (alkaline earth metal) [Formula: see text] Ca and Sr] denoted as BTO, BCTO and BSTO are reported in this work. The solid-state reaction method was used to synthesize these titanates. The as-synthesized samples were characterized for structural elucidation via X-ray diffraction (XRD), Fourier transform infrared spectra (FTIR), Raman inelastic scattering, energy dispersive analysis of X-rays (EDAX) and field emission scanning electron microscopy (FESEM). In addition to this, the samples were studied for optical bandgap, dielectric constant, dielectric loss, ac conductivity and polarization ([Formula: see text]–[Formula: see text]) studies. The XRD data analysis revealed that all the samples have acquired a tetragonal structure (P4mm) and are single phased. The Rietveld refinement of Ba[Formula: see text]Ca[Formula: see text]TiO3 confirms XRD results. In FTIR spectra, the absorption modes appearing at about 400[Formula: see text]cm[Formula: see text] and 500[Formula: see text]cm[Formula: see text] are attributes of the vibration of Ti–O bonds and Ba–O bonds, confirming the formation of desired samples. The appearance of the Raman mode of vibration at about 310[Formula: see text]cm[Formula: see text] is an indication of the tetragonal phase. FESEM micrographs of Ba[Formula: see text]Ca[Formula: see text]TiO3 reveal grain growth in the range of about 1[Formula: see text][Formula: see text]m and its EDAX spectrum confirms the composition of the sample. The optical bandgap was found to be 3.35[Formula: see text]eV, 3.1[Formula: see text]eV and 2.65[Formula: see text]eV for pristine, Ca[Formula: see text]- and Sr[Formula: see text]-doped BaTiO3, respectively. Frequency-dependent dielectric studies infer the samples to be extremely good dielectrics in nature with very low loss values. Polarization against a field at 1000[Formula: see text]V witnesses the samples to exhibit low polarization effects with lossy character. The dielectric and [Formula: see text]–[Formula: see text] behavior of Ba[Formula: see text]Sr[Formula: see text]TiO3 was found exceptional among all the reported titanates.
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来源期刊
Journal of Molecular and Engineering Materials
Journal of Molecular and Engineering Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-
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