Nota de FísicaPublicado
Mössbauer Study of Hydrated Iron Sulfates
S. I. Araujo; J. Danon; L. Iannarella
1991
Dados da publicação
- Autores
- S. I. Araujo; J. Danon; L. Iannarella
- Tipo
- Nota de Física
- Status
- Publicado
- Data de publicação
- 1991
- Descrição
- The hydrated iron sulfates amarantite <math>Fe(S0_{4})(OH).3H_{2}0\,\!</math>, copiapite <math>(Mg,Al)Fe^{3+}_{4}(SO_{4})_{6}(OH)_{2}.20H_{2}0\,\!</math> and ungemachite <math>K_{3}Na_{9}Fe(SO_{4})_{6}(OH)_{3}.9H_{2}0\,\!</math> were studied by Mössbauer Spectroscopy (MS) in connection with Differential Scanning Calorimetry (DSC). The effect of the dehydration on the hyperfine parameters at the Fe sites was investigated. For amarantite, the Mössbauer spectrum remained practically unchanged, while the <math>Fe^{3+}\,\!</math> quadrupole splittings for copiapite and ungemachite increased. The <math>Fe^{2+}\,\!</math> quadrupole spliting of ungemachite was also unchanged. We have found out the anisotropy of the recoiless absorption probability for the <math>^{57}Fe\,\!</math> Mössbauer gamma ray in amarantite. The three minerals were found to be highly hygroscopic after the dehydration consequent of the DSC measurements.
- Ano
- 1991
- Número
- CBPF-NF-003/91
- Vínculo com tese
- Não
- Vínculo com bolsa
- Não