Phase formation in the (1- y )BiFeO 3 - y BiScO 3 system under ambient and high pressure

Detalhes bibliográficos
Autor(a) principal: Salak, A. N.
Data de Publicação: 2017
Outros Autores: Khalyavin, D. D., Pushkarev, A. V., Radyush, Yu. V., Olekhnovich, N. M., Shilin, A. D., Rubanik, V. V.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10773/25384
Resumo: Formation and thermal stability of perovskite phases in the BiFe1-yScyO3 system (0≤y≤0.70) were studied. When the iron-to-scandium substitution rate does not exceed about 15 at%, the single-phase perovskite ceramics with the rhombohedral R3c symmetry (as that of the parent compound, BiFeO3) can be prepared from the stoichiometric mixture of the respective oxides at ambient pressure. Thermal treatment of the oxide mixtures with a higher content of scandium results in formation of two main phases, namely a BiFeO3-like R3c phase and a cubic (I23) sillenite-type phase based on γ-Bi2O3. Single-phase perovskite ceramics of the BiFe1-yScyO3 composition were synthesized under high pressure from the thermally treated oxide mixtures. When y is between 0 and 0.25 the high-pressure prepared phase is the rhombohedral R3c with the √2ap×√2ap×2√3ap superstructure (ap ~ 4 Å is the pseudocubic perovskite unit-cell parameter). The orthorhombic Pnma phase (√2ap×4ap×2√2ap) was obtained in the range of 0.30≤y≤0.60, while the monoclinic C2/c phase (√6ap×√2ap×√6ap) is formed when y=0.70. The normalized unit-cell volume drops at the crossover from the rhombohedral to the orthorhombic composition range. The perovskite BiFe1-yScyO3 phases prepared under high pressure are metastable regardless of their symmetry. At ambient pressure, the phases with the compositions in the ranges of 0.20≤y≤0.25, 0.30≤y<0.50 and 0.50≤y≤0.70 start to decompose above 970, 920 and 870 K, respectively
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spelling Phase formation in the (1- y )BiFeO 3 - y BiScO 3 system under ambient and high pressureMetastable phaseHigh-pressure synthesisPerovskiteSilleniteFormation and thermal stability of perovskite phases in the BiFe1-yScyO3 system (0≤y≤0.70) were studied. When the iron-to-scandium substitution rate does not exceed about 15 at%, the single-phase perovskite ceramics with the rhombohedral R3c symmetry (as that of the parent compound, BiFeO3) can be prepared from the stoichiometric mixture of the respective oxides at ambient pressure. Thermal treatment of the oxide mixtures with a higher content of scandium results in formation of two main phases, namely a BiFeO3-like R3c phase and a cubic (I23) sillenite-type phase based on γ-Bi2O3. Single-phase perovskite ceramics of the BiFe1-yScyO3 composition were synthesized under high pressure from the thermally treated oxide mixtures. When y is between 0 and 0.25 the high-pressure prepared phase is the rhombohedral R3c with the √2ap×√2ap×2√3ap superstructure (ap ~ 4 Å is the pseudocubic perovskite unit-cell parameter). The orthorhombic Pnma phase (√2ap×4ap×2√2ap) was obtained in the range of 0.30≤y≤0.60, while the monoclinic C2/c phase (√6ap×√2ap×√6ap) is formed when y=0.70. The normalized unit-cell volume drops at the crossover from the rhombohedral to the orthorhombic composition range. The perovskite BiFe1-yScyO3 phases prepared under high pressure are metastable regardless of their symmetry. At ambient pressure, the phases with the compositions in the ranges of 0.20≤y≤0.25, 0.30≤y<0.50 and 0.50≤y≤0.70 start to decompose above 970, 920 and 870 K, respectivelyElsevier2019-02-21T11:50:12Z2017-01-03T00:00:00Z2017-01-03info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10773/25384eng0022-459610.1016/j.jssc.2016.12.029Salak, A. N.Khalyavin, D. D.Pushkarev, A. V.Radyush, Yu. V.Olekhnovich, N. M.Shilin, A. D.Rubanik, V. V.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-02-22T11:49:19Zoai:ria.ua.pt:10773/25384Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T02:58:40.723017Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Phase formation in the (1- y )BiFeO 3 - y BiScO 3 system under ambient and high pressure
title Phase formation in the (1- y )BiFeO 3 - y BiScO 3 system under ambient and high pressure
spellingShingle Phase formation in the (1- y )BiFeO 3 - y BiScO 3 system under ambient and high pressure
Salak, A. N.
Metastable phase
High-pressure synthesis
Perovskite
Sillenite
title_short Phase formation in the (1- y )BiFeO 3 - y BiScO 3 system under ambient and high pressure
title_full Phase formation in the (1- y )BiFeO 3 - y BiScO 3 system under ambient and high pressure
title_fullStr Phase formation in the (1- y )BiFeO 3 - y BiScO 3 system under ambient and high pressure
title_full_unstemmed Phase formation in the (1- y )BiFeO 3 - y BiScO 3 system under ambient and high pressure
title_sort Phase formation in the (1- y )BiFeO 3 - y BiScO 3 system under ambient and high pressure
author Salak, A. N.
author_facet Salak, A. N.
Khalyavin, D. D.
Pushkarev, A. V.
Radyush, Yu. V.
Olekhnovich, N. M.
Shilin, A. D.
Rubanik, V. V.
author_role author
author2 Khalyavin, D. D.
Pushkarev, A. V.
Radyush, Yu. V.
Olekhnovich, N. M.
Shilin, A. D.
Rubanik, V. V.
author2_role author
author
author
author
author
author
dc.contributor.author.fl_str_mv Salak, A. N.
Khalyavin, D. D.
Pushkarev, A. V.
Radyush, Yu. V.
Olekhnovich, N. M.
Shilin, A. D.
Rubanik, V. V.
dc.subject.por.fl_str_mv Metastable phase
High-pressure synthesis
Perovskite
Sillenite
topic Metastable phase
High-pressure synthesis
Perovskite
Sillenite
description Formation and thermal stability of perovskite phases in the BiFe1-yScyO3 system (0≤y≤0.70) were studied. When the iron-to-scandium substitution rate does not exceed about 15 at%, the single-phase perovskite ceramics with the rhombohedral R3c symmetry (as that of the parent compound, BiFeO3) can be prepared from the stoichiometric mixture of the respective oxides at ambient pressure. Thermal treatment of the oxide mixtures with a higher content of scandium results in formation of two main phases, namely a BiFeO3-like R3c phase and a cubic (I23) sillenite-type phase based on γ-Bi2O3. Single-phase perovskite ceramics of the BiFe1-yScyO3 composition were synthesized under high pressure from the thermally treated oxide mixtures. When y is between 0 and 0.25 the high-pressure prepared phase is the rhombohedral R3c with the √2ap×√2ap×2√3ap superstructure (ap ~ 4 Å is the pseudocubic perovskite unit-cell parameter). The orthorhombic Pnma phase (√2ap×4ap×2√2ap) was obtained in the range of 0.30≤y≤0.60, while the monoclinic C2/c phase (√6ap×√2ap×√6ap) is formed when y=0.70. The normalized unit-cell volume drops at the crossover from the rhombohedral to the orthorhombic composition range. The perovskite BiFe1-yScyO3 phases prepared under high pressure are metastable regardless of their symmetry. At ambient pressure, the phases with the compositions in the ranges of 0.20≤y≤0.25, 0.30≤y<0.50 and 0.50≤y≤0.70 start to decompose above 970, 920 and 870 K, respectively
publishDate 2017
dc.date.none.fl_str_mv 2017-01-03T00:00:00Z
2017-01-03
2019-02-21T11:50:12Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
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dc.identifier.uri.fl_str_mv http://hdl.handle.net/10773/25384
url http://hdl.handle.net/10773/25384
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 0022-4596
10.1016/j.jssc.2016.12.029
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
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reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
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