NDLI: Phase transitions and interface phenomena in the cryogenic temperature domain of a niobate nanostructured ceramic

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Phase transitions and interface phenomena in the cryogenic temperature domain of a niobate nanostructured ceramic

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Nobre, M. A. L. Colin, C. V. Darie, C. Bellucci, F. S. Lanfredi, S.
Description	Author Affiliation: Lanfredi S ( Fac de Ciências e Tecnologia - FCT, Univ Estadual Paulista - UNESP, P.O. Box 467, Presidente Prudente-SP, 19060-900, Brazil. nobremal@fct.unesp.br.)
Abstract	Powder neutron diffraction and dielectric spectroscopy were used to investigate both crystallographic and dielectric permittivity properties of a $Sr_{2}KNb_{5}O_{15}$ single phase ferroelectric oxide with nanosized grains ranging from 35 nm to 90 nm. Measurements were carried out in the temperature range from 10 K (cryogenic) to 550 K. All neutron diffraction data were indexed on the basis of a tetragonal double unit cell. From 10 K to room temperature the space group of the $Sr_{2}KNb_{5}O_{15}$ ferroelectric phase was considered to be P4bm. The refinement of the paraelectric phase (at 550 K) was determined in the centrosymmetric space group P4/mbm. Dielectric spectroscopy measurements were performed in a thermal cycle. A set of four phase transitions non-related to symmetry changing was detected from Rietveld analysis of neutron powder diffraction data. During a thermal cycle, in the cryogenic temperature domain, strong thermal hysteresis is developed. Both phase transition and thermal hysteresis were correlated. These phenomena are associated with Nb-cation atomic displacements in the $NbO_{6}$ octahedra along the c-axis direction and of the domain with different frequencies involving grains as well as an excess of interfaces ascribed to the grain boundary. The bulk/grain boundary interfaces in nanostructured ceramics are correlated with the thermal stability phenomenon.
ISSN	14779226
Issue Number	28
Journal	Dalton Trans.
Volume Number	43
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2014-07-28
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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