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Type: Artigo de periódico
Title: Characterization of the time-dependent L-asparagine monohydrate crystal phase transition
Author: de Menezes, AS
Ardito, FM
dos Santos, AO
Moreno, AJD
Lima, RJC
Hayashi, MA
Cardoso, LP
Abstract: The high-temperature phase transition of single crystals of l-asparagine monohydrate was investigated by X-ray diffraction in association with Rietveld refinement and dilatometer measurements as a function of annealing time. The X-ray results showed that, for samples annealed at 343 K (or even 333 K) for 5 h, the expected anhydrous l-asparagine phase has been formed, monoclinic system (space group P2(1)), with lattice parameters a = 5.0677 (2), b = 6.7657 (2), c = 8.0742 (3) angstrom and beta = 91.276 (4)degrees. The results obtained from measurements as a function of annealing time confirmed that the phase transition associated with loss of the water molecule is time dependent.
Country: EUA
Editor: Wiley-blackwell
Citation: Journal Of Applied Crystallography. Wiley-blackwell, v. 44, n. 954, n. 957, 2011.
Rights: aberto
Identifier DOI: 10.1107/S002188981103322X
Date Issue: 2011
Appears in Collections:Unicamp - Artigos e Outros Documentos

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