caa a22 4500 463217071 CHVBK 20180405153200.0 cr unu---uuuuu 170326e20070801xx s 000 0 eng 10.1007/s00269-007-0156-8 doi (NATIONALLICENCE)springer-10.1007/s00269-007-0156-8 Characterization of a chalcopyrite from Brazil by Mössbauer spectroscopy and other physicochemical techniques [Elektronische Daten] [W. Mussel, E. Murad, J. Fabris, W. Moreira, J. Barbosa, C. Murta, W. Abrahão, J. De Mello, V. Garg] We studied a chalcopyrite from a Cu ore deposit in Rio Grande do Sul, Brazil, by Mössbauer spectroscopy at room temperature and 110K. Supporting methods to check for sample purity and to characterize further sample properties were slow-scanning X-ray powder diffraction and optical and microprobe analyses of polished sections of selected grains. Chemical analyses obtained using a scanning electron microscope equipped with an energy-dispersive X-ray spectrometer showed the sample to consist of homogeneous and essentially stoichiometric chalcopyrite (CuFeS2). Mössbauer spectra taken at both the above temperatures consist of asymmetric magnetically ordered patterns with unequal intensities of the line pairs 1-6 and 2-5, pointing to the existence of non-equivalent or multiple Fe sites. Least-squares fittings evidenced that the resonance intensity ratio of subspectrum with lower quadrupole shift (indicative of a more symmetric environment) to that with higher shift is 69:31, at room temperature, and 68:32, at 110 K. Rietveld refinement of the XRD data indicates the existence of tetragonal [a=0.52855(1) and c=1.0412(1)nm] and cubic [a 0=0.5273(2)nm] modifications in a proportion of 74:26, in good agreement with the Mössbauer data. The saturation magnetization of the sample was 32.7J/(Tkg), confirming the oxidation state of Fe as trivalent and pointing to little to no spin canting. Springer-Verlag, 2007 Chalcopyrite nationallicence Mössbauer spectroscopy nationallicence XRD Rietveld nationallicence SEM nationallicence Chemical analysis nationallicence Mussel W. Departamento de Química, Campus UFMG-Pampulha, 31270-901, Belo Horizonte, MG, Brazil aut Murad E. Departamento de Química, Campus UFMG-Pampulha, 31270-901, Belo Horizonte, MG, Brazil aut Fabris J. Departamento de Química, Campus UFMG-Pampulha, 31270-901, Belo Horizonte, MG, Brazil aut Moreira W. Departamento de Química, Campus UFMG-Pampulha, 31270-901, Belo Horizonte, MG, Brazil aut Barbosa J. CDTN/CNEN, Campus UFMG-Pampulha, 31270-901, Belo Horizonte, MG, Brazil aut Murta C. CDTN/CNEN, Campus UFMG-Pampulha, 31270-901, Belo Horizonte, MG, Brazil aut Abrahão W. Departamento de Solos, UFV, 36571-000, Viçosa, MG, Brazil aut De Mello J. Departamento de Solos, UFV, 36571-000, Viçosa, MG, Brazil aut Garg V. Instituto de Física, Núcleo de Ciências dos Materiais, Universidade de Brasília, 70910-900, Brasília, DF, Brazil aut Physics and Chemistry of Minerals Springer-Verlag 34/6(2007-08-01), 383-387 0342-1791 34:6<383 2007 34 269 https://doi.org/10.1007/s00269-007-0156-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00269-007-0156-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mussel W. Departamento de Química, Campus UFMG-Pampulha, 31270-901, Belo Horizonte, MG, Brazil aut NATIONALLICENCE 700 1- Murad E. Departamento de Química, Campus UFMG-Pampulha, 31270-901, Belo Horizonte, MG, Brazil aut NATIONALLICENCE 700 1- Fabris J. Departamento de Química, Campus UFMG-Pampulha, 31270-901, Belo Horizonte, MG, Brazil aut NATIONALLICENCE 700 1- Moreira W. Departamento de Química, Campus UFMG-Pampulha, 31270-901, Belo Horizonte, MG, Brazil aut NATIONALLICENCE 700 1- Barbosa J. CDTN/CNEN, Campus UFMG-Pampulha, 31270-901, Belo Horizonte, MG, Brazil aut NATIONALLICENCE 700 1- Murta C. CDTN/CNEN, Campus UFMG-Pampulha, 31270-901, Belo Horizonte, MG, Brazil aut NATIONALLICENCE 700 1- Abrahão W. Departamento de Solos, UFV, 36571-000, Viçosa, MG, Brazil aut NATIONALLICENCE 700 1- De Mello J. Departamento de Solos, UFV, 36571-000, Viçosa, MG, Brazil aut NATIONALLICENCE 700 1- Garg V. Instituto de Física, Núcleo de Ciências dos Materiais, Universidade de Brasília, 70910-900, Brasília, DF, Brazil aut NATIONALLICENCE 773 0- Physics and Chemistry of Minerals Springer-Verlag 34/6(2007-08-01), 383-387 0342-1791 34:6<383 2007 34 269 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer