Charge carrier concentration and mobility in alkali silicates
Autor(a) principal: | |
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Data de Publicação: | 2010 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFBA |
Texto Completo: | http://www.repositorio.ufba.br/ri/handle/ufba/567 |
Resumo: | The respective contributions of the charge carrier concentration and mobility to the ionic conductivity in glasses remain an open question. In the present work we calculate these two parameters from conductivity data as a function of temperature below and above the glass transition temperature, Tg. The basic hypothesis assumes that ionic displacement results from the migration of cationic pairs formed by a partial dissociation, which is a temperature-activated process. Below Tg their migration would follow a temperature-activated mechanism, while a free volume mechanism prevails above this temperature, leading to a deviation from the Arrhenius behavior. Expressions are formulated for the variation in ionic conductivity as a function of temperature in the supercooled and glassy states. Fitting the experimental data with the proposed expressions allows for the determination of characteristic parameters such as the charge carrier formation and migration enthalpies. Based on these values, it is then possible to calculate the charge carrier concentration and mobility in the entire temperature range. At room temperature, the mobility of effective charge carriers is estimated close to 104 cm2s-1V-1 for alkali disilicates glasses under study, while the ratio between the number of effective charge carriers and the total number of alkali cations is estimated to be 10-8 to 10-10, comparable to the concentration of intrinsic defects in an ionic crystal or dissociated species from a weak electrolyte solution |
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Nascimento, Marcio Luis FerreiraRodrigues, Ana Candida MartinsSouquet, Jean LouisNascimento, Marcio Luis FerreiraRodrigues, Ana Candida MartinsSouquet, Jean Louis2010-11-10T18:25:45Z2010-11-10T18:25:45Z201000219606http://www.repositorio.ufba.br/ri/handle/ufba/567The Journal of Chemical Physics, v. 132, p. 034704The respective contributions of the charge carrier concentration and mobility to the ionic conductivity in glasses remain an open question. In the present work we calculate these two parameters from conductivity data as a function of temperature below and above the glass transition temperature, Tg. The basic hypothesis assumes that ionic displacement results from the migration of cationic pairs formed by a partial dissociation, which is a temperature-activated process. Below Tg their migration would follow a temperature-activated mechanism, while a free volume mechanism prevails above this temperature, leading to a deviation from the Arrhenius behavior. Expressions are formulated for the variation in ionic conductivity as a function of temperature in the supercooled and glassy states. Fitting the experimental data with the proposed expressions allows for the determination of characteristic parameters such as the charge carrier formation and migration enthalpies. Based on these values, it is then possible to calculate the charge carrier concentration and mobility in the entire temperature range. At room temperature, the mobility of effective charge carriers is estimated close to 104 cm2s-1V-1 for alkali disilicates glasses under study, while the ratio between the number of effective charge carriers and the total number of alkali cations is estimated to be 10-8 to 10-10, comparable to the concentration of intrinsic defects in an ionic crystal or dissociated species from a weak electrolyte solutionSubmitted by Márcio Nascimento (mlfn@ufba.br) on 2010-11-10T18:25:45Z No. of bitstreams: 1 ChargeCarrierConcentration-JCP132-SouquetNascimentoRodrigues-Copy.pdf: 358521 bytes, checksum: 7f9f61b23288013d47e22c5d8b9fc9c8 (MD5)Made available in DSpace on 2010-11-10T18:25:45Z (GMT). No. of bitstreams: 1 ChargeCarrierConcentration-JCP132-SouquetNascimentoRodrigues-Copy.pdf: 358521 bytes, checksum: 7f9f61b23288013d47e22c5d8b9fc9c8 (MD5) Previous issue date: 2010-03-01Estados UnidosAIPVidroCondutividadeRavaine-SouquetEletrolito SolidoCondução IonicaCharge carrier concentration and mobility in alkali silicatesArtigo de Periódicoinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionengreponame:Repositório Institucional da UFBAinstname:Universidade Federal da Bahia (UFBA)instacron:UFBAinfo:eu-repo/semantics/openAccessORIGINALChargeCarrierConcentration-JCP132-SouquetNascimentoRodrigues-Copy.pdfChargeCarrierConcentration-JCP132-SouquetNascimentoRodrigues-Copy.pdfapplication/pdf358521https://repositorio.ufba.br/bitstream/ufba/567/1/ChargeCarrierConcentration-JCP132-SouquetNascimentoRodrigues-Copy.pdf7f9f61b23288013d47e22c5d8b9fc9c8MD51LICENSElicense.txtlicense.txttext/plain1895https://repositorio.ufba.br/bitstream/ufba/567/2/license.txt6a04e88f1f86f81891ef7040808b5ac6MD52TEXTChargeCarrierConcentration-JCP132-SouquetNascimentoRodrigues-Copy.pdf.txtChargeCarrierConcentration-JCP132-SouquetNascimentoRodrigues-Copy.pdf.txtExtracted texttext/plain38323https://repositorio.ufba.br/bitstream/ufba/567/3/ChargeCarrierConcentration-JCP132-SouquetNascimentoRodrigues-Copy.pdf.txtd2488d4c1532daa68800aefd82fd3c08MD53ufba/5672022-10-24 19:36:28.764oai:repositorio.ufba.br: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Repositório InstitucionalPUBhttp://192.188.11.11:8080/oai/requestopendoar:19322022-10-24T22:36:28Repositório Institucional da UFBA - Universidade Federal da Bahia (UFBA)false |
dc.title.en.fl_str_mv |
Charge carrier concentration and mobility in alkali silicates |
title |
Charge carrier concentration and mobility in alkali silicates |
spellingShingle |
Charge carrier concentration and mobility in alkali silicates Nascimento, Marcio Luis Ferreira Vidro Condutividade Ravaine-Souquet Eletrolito Solido Condução Ionica |
title_short |
Charge carrier concentration and mobility in alkali silicates |
title_full |
Charge carrier concentration and mobility in alkali silicates |
title_fullStr |
Charge carrier concentration and mobility in alkali silicates |
title_full_unstemmed |
Charge carrier concentration and mobility in alkali silicates |
title_sort |
Charge carrier concentration and mobility in alkali silicates |
author |
Nascimento, Marcio Luis Ferreira |
author_facet |
Nascimento, Marcio Luis Ferreira Rodrigues, Ana Candida Martins Souquet, Jean Louis |
author_role |
author |
author2 |
Rodrigues, Ana Candida Martins Souquet, Jean Louis |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Nascimento, Marcio Luis Ferreira Rodrigues, Ana Candida Martins Souquet, Jean Louis Nascimento, Marcio Luis Ferreira Rodrigues, Ana Candida Martins Souquet, Jean Louis |
dc.subject.eng.fl_str_mv |
Vidro Condutividade Ravaine-Souquet Eletrolito Solido Condução Ionica |
topic |
Vidro Condutividade Ravaine-Souquet Eletrolito Solido Condução Ionica |
description |
The respective contributions of the charge carrier concentration and mobility to the ionic conductivity in glasses remain an open question. In the present work we calculate these two parameters from conductivity data as a function of temperature below and above the glass transition temperature, Tg. The basic hypothesis assumes that ionic displacement results from the migration of cationic pairs formed by a partial dissociation, which is a temperature-activated process. Below Tg their migration would follow a temperature-activated mechanism, while a free volume mechanism prevails above this temperature, leading to a deviation from the Arrhenius behavior. Expressions are formulated for the variation in ionic conductivity as a function of temperature in the supercooled and glassy states. Fitting the experimental data with the proposed expressions allows for the determination of characteristic parameters such as the charge carrier formation and migration enthalpies. Based on these values, it is then possible to calculate the charge carrier concentration and mobility in the entire temperature range. At room temperature, the mobility of effective charge carriers is estimated close to 104 cm2s-1V-1 for alkali disilicates glasses under study, while the ratio between the number of effective charge carriers and the total number of alkali cations is estimated to be 10-8 to 10-10, comparable to the concentration of intrinsic defects in an ionic crystal or dissociated species from a weak electrolyte solution |
publishDate |
2010 |
dc.date.accessioned.fl_str_mv |
2010-11-10T18:25:45Z |
dc.date.available.fl_str_mv |
2010-11-10T18:25:45Z |
dc.date.issued.fl_str_mv |
2010 |
dc.type.driver.fl_str_mv |
Artigo de Periódico info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://www.repositorio.ufba.br/ri/handle/ufba/567 |
dc.identifier.issn.none.fl_str_mv |
00219606 |
dc.identifier.number.en.fl_str_mv |
The Journal of Chemical Physics, v. 132, p. 034704 |
identifier_str_mv |
00219606 The Journal of Chemical Physics, v. 132, p. 034704 |
url |
http://www.repositorio.ufba.br/ri/handle/ufba/567 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
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openAccess |
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Universidade Federal da Bahia (UFBA) |
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UFBA |
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