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Enhancement of the dielectric response through Al-substitution in La1.6Sr0.4NiO4 nickelates

机译:通过La1.6SR0.4NiO4镍酸层的替代磷酸盐的提高

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摘要

The structures and dielectric properties of La1.6Sr0.4Ni1-xAlxO4 (x = 0, 0.2 and 0.4) ceramics elaborated using the Pechini method were studied for the first time. The same unique tetragonal phase was found in all compounds. The lattice parameters were found using Rietveld refinement. The surface morphology characterization and elemental analysis of these samples were respectively carried out using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). A giant dielectric response was observed in these ceramics, and one dielectric relaxation was found. The substitution of nickel with aluminum results in a colossal dielectric constant value (>10(6)). The dielectric loss also drops with the increasing Al content; for x = 0.4 it is divided by 100 at room temperature for low frequencies. The giant dielectric response and low-temperature relaxation were mainly attributed to thermally activated small polaronic hopping in these compounds.
机译:第一次研究了使用Pechini方法阐述的LA1.6SR0.4NI1-XALXO4(X = 0,0.2和0.4)陶瓷的结构和介电性能。 在所有化合物中发现了相同的独特四方相。 使用RIETVELD改进发现晶格参数。 这些样品的表面形态表征和元素分析分别使用扫描电子显微镜(SEM)和能量分散X射线光谱(EDS)进行。 在这些陶瓷中观察到巨大介电响应,并发现了一种介电松弛。 用铝的镍取代导致巨大介电常数(> 10(6))。 介电损耗也随着Al含量的增加而下降; 对于x = 0.4,它在室温下除以100的频率。 巨大介电响应和低温松弛主要归因于这些化合物中的热活化小极性跳跃。

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  • 来源
    《RSC Advances》 |2016年第29期|共6页
  • 作者单位

    Univ Sfax Fac Sci Sfax Lab Phys Mat BP 1171 Sfax 3018 Tunisia;

    Univ Bourgogne Franche Comte CNRS UMR 6303 Lab Interdisciplinaire Carnot Bourgogne ICB 9 AV Alain Savary BP 47870 F-21078 Dijon France;

    Univ Bourgogne Franche Comte CNRS UMR 6303 Lab Interdisciplinaire Carnot Bourgogne ICB 9 AV Alain Savary BP 47870 F-21078 Dijon France;

    Univ Sfax Fac Sci Sfax Lab Phys Mat BP 1171 Sfax 3018 Tunisia;

    Univ Sfax Fac Sci Sfax Lab Phys Mat BP 1171 Sfax 3018 Tunisia;

    Univ Sfax Fac Sci Sfax Lab Chim Inorgan Ur Es 73 11 BP 1171 Sfax 3018 Tunisia;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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