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Pure K0.5Na0.5NbO3 (KNN) and KNN doped with Li+ (6% mole), La3+ (1.66%, 5%, 6% mole), and Ti4+ (10% mole) were prepared by mixture of oxides using high-energy milling and conventional solid-state reaction. The effects of the dopant on the physical properties of pure KNN have been evaluated based on the structural, ferroelectric, pyroelectric, and dielectric measurements. The XRD measurements show that KNN pure sample contains a mixture of monoclinic and orthorhombic crystalline phases, with a slightly higher concentration of monoclinic phase. In contrast, all doped samples show a higher concentration of the orthorhombic phase, as well as the presence of a secondary phase (K6Nb10.8O30), also detected by Raman measurements. The samples with a higher concentration of this secondary phase, also present greater dielectric losses and lower values of remnant polarization. The dielectric measurements allowed us to detect temperatures of structural transitions (orthorhombic-tetragonal, O-T) previous to the ferroelectric-paraelectric transition (tetragonal-cubic, T-C), and also in this set of samples, a direct correlation was found between the values of remnant polarization and the corresponding pyroelectric signal response.


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Study of the structural, ferroelectric, dielectric, and pyroelectric properties of the K0.5Na0.5NbO3 system doped with Li+, La3+, and Ti4+

Show Author's information C. MONTERO-TAVERAaM. D. DURRUTHY-RODRÍGUEZbF. D. CORTÉS-VEGAaJ. M. YAÑEZ-LIMÓNa( )
Center for Research and Advanced Studies of IPN, Campus Querétaro, Mexico
National Evangelical University, Paseo de los Periodistas #54, Ensanche Miraflores, Santo Domingo, Distrito Nacional, República Dominicana

Abstract

Pure K0.5Na0.5NbO3 (KNN) and KNN doped with Li+ (6% mole), La3+ (1.66%, 5%, 6% mole), and Ti4+ (10% mole) were prepared by mixture of oxides using high-energy milling and conventional solid-state reaction. The effects of the dopant on the physical properties of pure KNN have been evaluated based on the structural, ferroelectric, pyroelectric, and dielectric measurements. The XRD measurements show that KNN pure sample contains a mixture of monoclinic and orthorhombic crystalline phases, with a slightly higher concentration of monoclinic phase. In contrast, all doped samples show a higher concentration of the orthorhombic phase, as well as the presence of a secondary phase (K6Nb10.8O30), also detected by Raman measurements. The samples with a higher concentration of this secondary phase, also present greater dielectric losses and lower values of remnant polarization. The dielectric measurements allowed us to detect temperatures of structural transitions (orthorhombic-tetragonal, O-T) previous to the ferroelectric-paraelectric transition (tetragonal-cubic, T-C), and also in this set of samples, a direct correlation was found between the values of remnant polarization and the corresponding pyroelectric signal response.

Keywords:

K0.5Na0.5NbO3 (KNN), lead-free, solid-state reaction, structural properties, pyroelectric properties, dielectric properties, Li, La, Ti doping elements
Received: 20 November 2019 Revised: 12 February 2020 Accepted: 08 March 2020 Published: 05 June 2020 Issue date: June 2020
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Publication history
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Publication history

Received: 20 November 2019
Revised: 12 February 2020
Accepted: 08 March 2020
Published: 05 June 2020
Issue date: June 2020

Copyright

© The Author(s) 2020

Acknowledgements

The authors express their thanks to CONACYT for funding this research through projects CB-240460 and LN-295261, and to LIDTRA for the facilities in the use of experimental infrastructure. To the research assistants Martín Adelaido Hernández Landaverde, Rivelino Flores Farias, Agustín Galindo Sifuentes, and Carlos Alberto Avila Herrera. C. Montero-Tavera and F. D. Cortes-Vega thank CONACYT for the scholarships granted to complete the Ph.D. studies and postdoctoral position, respectively.

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