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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 ℃ and 1190 ℃ 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 (Eg) 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.


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

Show Author's information M. D. DURRUTHY-RODRÍGUEZa,c( )M. HERNÁNDEZ-GARCÍAaJ. PORTELLESa,bJ. FUENTESa,bM. A. HERNÁNDEZ-LANDAVERDEcM. RAMÍREZ CARDONAdJ. M. YAÑEZ-LIMÓNc
Departamento de Física Aplicada, Instituto de Cibernética, Matemática y Física, CITMA, 15 # 551, Vedado, La Habana, CP 10400, Cuba
Facultad de Física, Universidad de La Habana, San Lázaro y L, Vedado, La Habana, CP 10400, Cuba
CINVESTAV-Unidad Querétaro, IPN, Libramiento Norponiente 2000, Fracc. Real de Juriquilla, CP 76230, Querétaro, México
Centro de Investigaciones en Ciencias de la Tierra y Materiales, Universidad Autónoma del Estado de Hidalgo, México

Abstract

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 ℃ and 1190 ℃ 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 (Eg) 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)
Received: 23 November 2014 Revised: 26 January 2015 Accepted: 02 February 2015 Published: 04 July 2015 Issue date: September 2015
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Publication history

Received: 23 November 2014
Revised: 26 January 2015
Accepted: 02 February 2015
Published: 04 July 2015
Issue date: September 2015

Copyright

© The author(s) 2015

Acknowledgements

This research was supported by the project PI-ICIMAF 10/11, Cuba. Postdoctoral and Sabbatical Program for the consolidation of research groups of Conacyt. M. D. Durruthy, M. Hernández-García, and J. M Yáñez are grateful for the financial support from Conacyt-ICTP-SMF and DGAPA-UNAM for the research grant for J. Fuentes. Finally the authors acknowledge the facilities of the national laboratory for the research and development in advanced coatings, LIDTRA CONACYT 123630.

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