Preparation of Stoichiometric Crystalline Li(Nb,Ti)O&lt;sub&gt;3&lt;/sub&gt; Solid Solutions by Sol-Gel Processing with Metal Alkoxides

Hayashi, Hikoshiro; Urabe, Kazuyori; Niihara, Koichi

doi:10.4028/www.scientific.net/kem.161-163.501

Cited by 20 publications

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“…Since the discovery of this M Phase by Villafuerte-Castrejon et al [1,2], both its crystal structure [3][4][5][6] and the applications of Phase M [7][8][9] have been studied. LNT solid solutions of M Phase have a hexagonal subcell similar to the unit cell of LiNbO 3 , which belongs to the trigonal system (R3c), and has lattice constants of a = 0.5148 nm, c = 1.3863 nm.…”

Section: Introductionmentioning

confidence: 99%

“…LNT solid solutions of M Phase have a hexagonal subcell similar to the unit cell of LiNbO 3 , which belongs to the trigonal system (R3c), and has lattice constants of a = 0.5148 nm, c = 1.3863 nm. The superstructure of LNT solid solutions was identified using HREM as having layer-like domains [4,5], where stacking faults are inserted parallel to the c axis in the LiNbO 3 structure. The stacking faults have a rock-salt structure and the dimension of the domain along the c axis based on a LiNbO 3 -like subcell has been controlled by TiO 2 content and sintering temperature [5].…”

Section: Introductionmentioning

confidence: 99%

“…The superstructure of LNT solid solutions was identified using HREM as having layer-like domains [4,5], where stacking faults are inserted parallel to the c axis in the LiNbO 3 structure. The stacking faults have a rock-salt structure and the dimension of the domain along the c axis based on a LiNbO 3 -like subcell has been controlled by TiO 2 content and sintering temperature [5]. The period of superstructure was shown to decrease with increasing TiO 2 content.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation and preparation of Li1+x−yNb1−x−3yTix+4yO3 solid solution with superstructure as new phosphor

Hayashi

Nakano

2010

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluation and preparation of Li1+x−yNb1−x−3yTix+4yO3 solid solution with superstructure as new phosphor

Hayashi

Nakano

2010

Journal of Alloys and Compounds

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“…Esto se debe al radio iónico del Eu 3+ , aún así la dirección que sigue la región de solubilidad dentro del diagrama ternario de fases es hacia Eu 2 O 3 , lo cual implica un mecanismo de formación estequiométrico. Resultados de experimentos de luminiscencia (77,78) , por sus interesantes propiedades ópticas y ferroeléctricas (80)(81)(82)(83)(84)(85)(86)(87)(88)(89)(90)(91)(92)(93)(94)(95). La aplicación más interesante para las soluciones sólidas de LiNbO 3 con Ti 4+ es como guía de onda óptica.…”

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Estudio de las soluciones de los ferroeléctricos LiNbO<sub>3</sub> y LiTaO<sub>3</sub>

Castrejón¹

2002

Bol. Soc. Esp. Ceram. Vidr.

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Los compuestos cerámicos LiNbO 3 y LiTaO 3 han sido estudiados considerablemente en los últimos años, debido a las interesantes propiedades ópticas y eléctricas (piezoelectricidad, piroelectricidad, ferroelectricidad) que presentan. Por estas razones estos materiales se consideran excelentes candidatos para un gran número de aplicaciones tecnológicas. Una característica importante de estos compuestos, es la facilidad con la que forman series de soluciones sólidas, incorporando diferentes cationes en sus redes. Se han obtenido series de soluciones sólidas con cationes de diferente tamaño y diferente carga con la consiguiente variación de las propiedades eléctricas y ópticas. En este trabajo se presenta un resumen de los estudios de las soluciones sólidas de LiNbO 3 y LiTaO 3 , los mecanismos de formación y los sitios que ocupan los cationes en la celda unidad, así como algunas de sus propiedades físicas más representativas Palabras clave: Niobato de litio, tantalato de litio, soluciones sólidas, ferroeléctricos Study of the ferroelectric LiNbO 3 and LiTaO 3 solid solutionsCeramic compounds LiNbO 3 and LiTaO 3 have been widely studied in the last years due to their interesting optical and electrical properties (piezoelectricity, piroelectricity, ferroelectricity). For this reason these materials are regarded excellent candidates for technological applications. An important characteristic of these compounds is the facility to form solid solution series, a large number of cations can be accommodated in the lattice and thus different optical and electrical properties have been obtained. In this work a review of LiNbO 3 and LiTaO 3 solid solutions is presented, the formation mechanisms, cation sites in the unitcell and some of the most representative properties are also included. Keywords INTRODUCCIÓNEl LiNbO 3 y el LiTaO 3 son compuestos muy versátiles. Desde los años setenta se han estudiado por sus numerosas aplicaciones y propiedades. En los ochenta, el enfoque principal se centró en los efectos producidos por la introducción de diversos cationes en solución sólida. En la última década se ha usado extensamente la técnica EXAFS (X ray absortion fine structure), además de méto-dos de simulaciones, para determinar los sitios que ocupan en la red estos diferentes cationes que forman las soluciones sólidas (1, 2).Actualmente el interés principal es el establecer una correlación entre los defectos provocados en estas redes al introducir diferentes cationes y los cambios en las propiedades físicas antes mencionadas.En principio, la determinación de los sitios que ocupan los cationes adicionados para formar soluciones sóli-das en estos materiales no es un problema sencillo, debido a la estructura pseudo-ilmenita que presentan. Esta estructura, descrita por diversos autores (3, 4), puede considerarse como una superestructura del corindón, en la que se reemplazan dos Al 3+ por un Li + y un Ta 5+, la cual está formada por cadenas de octaedros que comparten las caras a lo largo del eje polar c (Fig.1). 325Figura 1. Estructur...

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“…The superstructure of LNT solid solutions has been identified via High-resolution Transmission Electron Microscopy (HREM) studies as having layer-like domains. 4), 5) where stacking faults are inserted parallel to the c axis in the LiNbO3 structure. These stacking faults have a rock-salt structure and the dimension of the domain along the c axis based on a LiNbO3-like subcell has been controlled by TiO2 content and sintering temperature.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and luminescence of Eu-doped Li1+x-yNb1-x-3yTix+4yO3 solid solutions with superstructure

Hayashi¹,

Nakano

Jones

2010

J. Ceram. Soc. Japan

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Eu doped Li-Nb-Ti oxide (LNT) solid solutions were prepared by heating mixed powders at temperatures of 1120°C for up to 24 h. Despite the fact that these materials often possess a crystallographic superstructure, no such structure was observed for a sintering time of 10 h. For the longer sintering period of 24 h, no superstructure was observed for samples with less additions of TiO2, but it was confirmed by X-ray diffraction and a High-Resolution Transmission Electron Microscopy that samples with compositions containing 20 and 25 mol%-TiO2 did possess superstructures. Heating for 24 h resulted in an improvement of the photoluminescence (PL) intensity of the LNT solid solutions, and this increase was more marked in the samples where the superstructure was developed. For the Eu-doped LNT solid solution containing 25 mol%-TiO2, the PL intensity of the sample with the superstructure was almost 3 times as high as that of a sample with the same doping but without the superstructure.

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Preparation of Stoichiometric Crystalline Li(Nb,Ti)O<sub>3</sub> Solid Solutions by Sol-Gel Processing with Metal Alkoxides

Cited by 20 publications

References 0 publications

Evaluation and preparation of Li1+x−yNb1−x−3yTix+4yO3 solid solution with superstructure as new phosphor

Evaluation and preparation of Li1+x−yNb1−x−3yTix+4yO3 solid solution with superstructure as new phosphor

Estudio de las soluciones de los ferroeléctricos LiNbO<sub>3</sub> y LiTaO<sub>3</sub>

Microstructure and luminescence of Eu-doped Li1+x-yNb1-x-3yTix+4yO3 solid solutions with superstructure

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