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      Novas cerâmicas ferroelétricas transparentes com altos coeficientes eletroópticos: PLMN-PT Translated title: New transparent ferroelectric ceramics with high electro-optical coefficients: PLMN-PT

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          Abstract

          Cerâmicas de niobato de magnésio e chumbo (PMN) pertencem à classe de materiais ferroelétricos usados em diversas aplicações tecnológicas. Contudo, existe grande dificuldade em produzir cerâmicas de PMN sem a formação de fases secundarias. Estudos recentes mostraram que a adição de PT e La permitem, respectivamente, estabilizar a fase perovskita e atingir-se a transparência da ordem das cerâmicas comerciais de PLZT. Neste trabalho realizou-se a síntese de pós do sistema (1-x)PLMN-xPT em função de PT (11 < x < 15), para 1% em mol de La. Encontraram-se apenas traços de fase pirocloro (2-3%) nos difratogramas de raios X dos pós, sem uma relação direta com a concentração de PT. Foram alcançadas alta taxa de densificação e microestrutura homogênea com prensagem uniaxial a quente. A transmitância óptica passou por um máximo (até 55% em λ= 632 nm) para x= 0,14. Coeficientes eletro-ópticos quadráticos tão altos quanto 17,5 x10-16m²/V² posicionam estes materiais como de melhor resposta electro-óptica entre os ferroelétricos.

          Translated abstract

          Lead magnesium niobate ceramics (PMN) belong to the class of ferroelectric materials used in various technological applications. However it is very difficult to produce a single phase material consisting of only the perovskite structure. Recent studies have shown that the addition of PT and La permit, respectively, to stabilize the perovskite phase and to achieve transparency of the order of commercial PLZT ceramics. In this work the powder synthesis of the system (1-x)PLMN-xPT as a function of PT (0.11<x<0.15), for 1% mol of La, was carried out. Only traces of pyrochlore phase (2-3%) in DRX powder were found, without a direct relationship with the concentration of PT. The results revealed a homogeneous microstructure, high density for all the compositions densified by hot pressing. High optical transmittance for x = 0.14 was found (55% in λ= 632 nm). Quadratic electro-optic coefficients as high as 17.5 x10-16 m²/V² position these ceramics as the best response among the electro-optic ferroelectrics.

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          Most cited references18

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          Am. Ceram. Soc. Bull.

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            Ferroelectrics Devices

            K Uchino (2000)
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              Electronic Ceramics: Properties, Devices and Applications

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                ce
                Cerâmica
                Cerâmica
                Associação Brasileira de Cerâmica (São Paulo )
                1678-4553
                December 2011
                : 57
                : 344
                : 404-408
                Affiliations
                [1 ] Universidade Federal de São Carlos Brazil
                Article
                S0366-69132011000400005
                10.1590/S0366-69132011000400005
                b390f5ed-df34-4709-8c82-a518f065355f

                http://creativecommons.org/licenses/by/4.0/

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                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=0366-6913&lng=en
                Categories
                MATERIALS SCIENCE, CERAMICS

                Ceramics
                PLMN-PT ceramics,optical transmittance,electro-optic coefficients,cerâmicas de PLMN-PT,transmitância óptica,coeficientes eletroópticos

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