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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/36891
Title: 
Thermal decomposition and rehydration of strontium oxalate: morphological evolution
Author(s): 
Institution: 
Universidade Estadual Paulista (UNESP)
ISSN: 
1466-6049
Abstract: 
Undoped and Eu3+ doped monohydrate strontium oxalate samples were precipitated under ultrasound and conventional stirring and were heated at different temperatures. All samples were characterized by X-ray powder diffraction (XDR), infrared spectra (IR) and scanning electron microscopy (SEM). Monohydrate, dehydrate oxalates and carbonate particles are ellipsoids indicating a topotatic process. Particle size decrease is observed when ultrasound stirring and europium. doping are used and rehydration of strontium oxalate results in uniform hexagonal particle shape. An oxide and carbonate mixture is obtained from oxalates treated at 1050 degreesC and its suspension in water undergoes incomplete hydrolysis. The products from this incomplete hydrolysis present dendrite shape particles only when the former is precipitated under ultrasound stirring. In this process, surface energy is important for particle dispersion and ultrasound supplies activation energy to oxalate precursor. (C) 2001 Elsevier B.V. Ltd. All rights reserved.
Issue Date: 
1-Sep-2001
Citation: 
International Journal of Inorganic Materials. Oxford: Elsevier B.V., v. 3, n. 6, p. 443-452, 2001.
Time Duration: 
443-452
Publisher: 
Elsevier B.V.
Keywords: 
  • strontium oxalate
  • strontium carbonate
  • precipitation and ultrasound
Source: 
http://dx.doi.org/10.1016/S1466-6049(01)00047-2
URI: 
Access Rights: 
Acesso restrito
Type: 
outro
Source:
http://repositorio.unesp.br/handle/11449/36891
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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