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
- Universidade Estadual Paulista (UNESP)
- 1466-6049
- 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.
- 1-Sep-2001
- International Journal of Inorganic Materials. Oxford: Elsevier B.V., v. 3, n. 6, p. 443-452, 2001.
- 443-452
- Elsevier B.V.
- strontium oxalate
- strontium carbonate
- precipitation and ultrasound
- http://dx.doi.org/10.1016/S1466-6049(01)00047-2
- Acesso restrito
- outro
- http://repositorio.unesp.br/handle/11449/36891 Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.