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Determination of the Chemical Composition of Lithium Niobate Powders

1
Instituto de Física, Universidad Nacional Autónoma de México, 04510 Mexico City, México
2
Departamento de Mecátronica y Energías Renovables, Universidad Tecnológica de Ciudad Juárez, Avenida Universidad Tecnológica 3051, Colonia Lote Bravo II, 32695 Ciudad Juárez, Chihuahua, México
3
Instituto de Ingeniería y Tecnología, Universidad Autónoma de Ciudad Juárez, Av. Del Charro 450 Norte, 32310 Ciudad Juárez, Chihuahua, México
4
Laboratorio de Investigación y Desarrollo de Materiales Avanzados, Universidad Autónoma del Estado de México, Paseo Colón esquina Paseo Tollocan, 50120 Toluca, Estado de México, México
*
Authors to whom correspondence should be addressed.
Crystals 2019, 9(7), 340; https://doi.org/10.3390/cryst9070340
Received: 21 March 2019 / Revised: 26 April 2019 / Accepted: 30 April 2019 / Published: 3 July 2019
(This article belongs to the Special Issue Recent Progress in Lithium Niobate)
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Abstract

Existent methods for determining the composition of lithium niobate single crystals are mainly based on their variations due to changes in their electronic structure, which accounts for the fact that most of these methods rely on experimental techniques using light as the probe. Nevertheless, these methods used for single crystals fail in accurately predicting the chemical composition of lithium niobate powders due to strong scattering effects and randomness. In this work, an innovative method for determining the chemical composition of lithium niobate powders, based mainly on the probing of secondary thermodynamic phases by X-ray diffraction analysis and structure refinement, is employed. Its validation is supported by the characterization of several samples synthesized by the standard and inexpensive method of mechanosynthesis. Furthermore, new linear equations are proposed to accurately describe and determine the chemical composition of this type of powdered material. The composition can now be determined by using any of four standard characterization techniques: X-Ray Diffraction (XRD), Raman Spectroscopy (RS), UV-vis Diffuse Reflectance (DR), and Differential Thermal Analysis (DTA). In the case of the existence of a previous equivalent description for single crystals, a brief analysis of the literature is made. View Full-Text
Keywords: chemical composition; lithium niobate; powders; microparticles; nanocrystals chemical composition; lithium niobate; powders; microparticles; nanocrystals
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Sánchez-Dena, O.; Villagómez, C.J.; Fierro-Ruíz, C.D.; Padilla-Robles, A.S.; Farías, R.; Vigueras-Santiago, E.; Hernández-López, S.; Reyes-Esqueda, J.-A. Determination of the Chemical Composition of Lithium Niobate Powders. Crystals 2019, 9, 340.

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