Influence of the sintering temperature on the optical properties of Pb(Ti Ni)O_3-δ and (K Ba)(Nb Ni)O_3-δ ceramics

P. T. P. de AbreuGrupo de Materiais Multifuncionais e Sensores, Universidade Federal de São Paulo - Instituto de Ciência e Tecnologia, São José dos Campos, SP, Brazil;

N. F. da Costa VargasGrupo de Materiais Multifuncionais e Sensores, Universidade Federal de São Paulo - Instituto de Ciência e Tecnologia, São José dos Campos, SP, Brazil;

R. C. GennariGrupo de Materiais Multifuncionais e Sensores, Universidade Federal de São Paulo - Instituto de Ciência e Tecnologia, São José dos Campos, SP, Brazil;

R. LangGrupo de Materiais Multifuncionais e Sensores, Universidade Federal de São Paulo - Instituto de Ciência e Tecnologia, São José dos Campos, SP, Brazil;

J. A. EirasDepartamento de Física - Grupo de Materiais Ferróicos, Universidade Federal de São Carlos, São Carlos, SP, Brazil

M. H. LenteGrupo de Materiais Multifuncionais e Sensores, Universidade Federal de São Paulo - Instituto de Ciência e Tecnologia, São José dos Campos, SP, Brazil; Correspondence[email protected]

Abstract

The influence of sintering temperature on the optical properties of (K_0.8Ba_0.2)(Nb_0.9Ni_0.1)O_3-δ (KBNNO) and Pb(Ti_0.9Ni_0.1)O_3-δ (PTNi) ceramics was investigated. It was found that by increasing the sintering temperature the KBNNO samples change their color from yellow to dark-green, while PTNi slightly change the color from pale-green to green. At room temperature such modifications in the electronic structure were associated to the influence of the ferroelectric polarization, dipolar defects and oxygen vacancies on the crystalline field. Above Curie temperature, it is believed that the contribution of dipolar defects and oxygen vacancies are still present and intense enough to modify the crystalline field.

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Acknowledgments

The authors thank the Brazilian agencies FAPESP (proc. 2017/13769-1), CNPq, CAPES and FINEP for financial support.

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Influence of the sintering temperature on the optical properties of Pb(Ti Ni)O_3-δ and (K Ba)(Nb Ni)O_3-δ ceramics

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Influence of the sintering temperature on the optical properties of Pb(Ti Ni)O3-δ and (K Ba)(Nb Ni)O3-δ ceramics

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Influence of the sintering temperature on the optical properties of Pb(Ti Ni)O_3-δ and (K Ba)(Nb Ni)O_3-δ ceramics