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Synthesis and microstructures of La1−xCaxCrO3 perovskite powders for optical properties

  • Yimin Wan
  • Jian Yang
  • Haigang Hou
  • Shunjian Xu
  • Guiwu LiuEmail author
  • Shahid HussainEmail author
  • Guanjun Qiao
Article

Abstract

Calcium-doped lanthanum chromates La1−xCaxCrO3 (0 ≤ x ≤ 0.4) are successfully synthesized using sol–gel method. The La1−xCaxCrO3 powders were characterized using X-ray diffraction, scanning electron microscope, X-ray photoelectron spectroscopy and Ultraviolet–Visible spectroscopy. To determine appropriate calcination temperature, the thermal decomposition process of La0.8Ca0.2CrO3 precursor is investigated via thermogravimetric and differential scanning calorimetry, X-ray diffraction and Fourier Transform Infrared spectroscopy analyses. The highest crystallization in La0.8Ca0.2CrO3 can be obtained while calcining at 800 °C. The microstructural analyses demonstrate that the La1−xCaxCrO3 nanoperovskite powders with a diameter of ~ Ø20 nm are nearly spherical, whereas the grain sizes decrease with increasing the doping concentration of calcium. The substantial formation of Cr6+ ions after Ca-doping decrease the band gap energy of powders achieved during the formation of impurity energy level, which can contribute in potential optical applications.

Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China (51572112), the Six Talent Peaks Project of Jiangsu Province (TD-XCL-004), the 333 talents project of Jiangsu Province (BRA2017387) and the Innovation/Entrepreneurship Program ([2015]26) and the Qing Lan Project ([2016]15) of Jiangsu Province.

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Authors and Affiliations

  1. 1.School of Materials Science and EngineeringJiangsu UniversityZhenjiangChina
  2. 2.School of Mechanical and Electrical EngineeringXinyu UniversityXinyuChina
  3. 3.State Key Laboratory for Mechanical Behavior of MaterialsXi’an Jiaotong UniversityXi’anChina

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