Strong emissions of blue–yellow–red regions of La and Ti modified KNaNbO3 ferroelectric ceramics

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• 作者：M. D. Durruthy-Rodríguez ; M. Hernández-García ; J. Portelles…
• 关键词：emission spectra ; condense matter ; ferroelectric materials ; band structure ; X ; ray diffraction (XRD)
• 刊名：Journal of Advanced Ceramics
• 出版年：2015
• 出版时间：September 2015
• 年：2015
• 卷：4
• 期：3
• 页码：183-189
• 全文大小：1,290 KB
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• 作者单位：M. D. Durruthy-Rodríguez (1) (3)
  M. Hernández-García (1)
  J. Portelles (1) (2)
  J. Fuentes (1) (2)
  M. A. Hernández-Landaverde (3)
  M. Ramírez Cardona (4)
  J. M. Ya?ez-Limón (3)
  
  1. Departamento de Física Aplicada, Instituto de Cibernética, Matemática y Física, CITMA, La Habana, CP 10400, Cuba
  3. CINVESTAV-Unidad Querétaro, IPN, Libramiento Norponiente 2000, Fracc. Real de Juriquilla, CP 76230, Querétaro, México
  2. Facultad de Física, Universidad de La Habana, San Lázaro y L, Vedado, La Habana, CP 10400, Cuba
  4. Centro de Investigaciones en Ciencias de la Tierra y Materiales, Universidad Autónoma del Estado de Hidalgo, Querétaro, México
  
• 刊物主题：Ceramics, Glass, Composites, Natural Methods; Characterization and Evaluation of Materials; Nanotechnology; Structural Materials;
• 出版者：Springer Berlin Heidelberg
• ISSN：2227-8508

文摘

In this work, the results of the study on the optical properties of the perovskite structure ABO₃ with La3+ substitution for ions K+ and Na+ in the A site and Ti4+ substitution for ion Nb5+ in the B site are presented. The ceramics were sintered at 1100°C and 1190°C and formed at 10 MPa and 80 MPa. Dense ceramics were obtained with 94% of the theoretical density. The piezoresponse force microscopy (PFM) showed needle-shaped grains with a size of 30 nm for the samples formed at 10 MPa at both sintering temperatures. Apparently, the high temperature and high pressure used in formation reduced the energy of the band gap (E _g) from 3.36 to 3.09 eV. Strong emissions to 2.19, 1.86, 2.5, and 2.31 eV were obtained by exciting the samples at 325, 373, 457, and 500 nm, respectively; these emissions corresponded to blue–yellow–red regions of the visible spectrum. Keywords emission spectra condense matter ferroelectric materials band structure X-ray diffraction (XRD)