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Delafossite structure of heterogenite polytypes (HCoO2) by Raman and infrared micro-spectroscopy.

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Title: Delafossite structure of heterogenite polytypes (HCoO2) by Raman and infrared micro-spectroscopy.
Authors: Burlet, C.1 christian.burlet@naturalsciences.be, Goethals, H.1, Vanbrabant, Y.1
Source: Spectrochimica Acta Part A: Molecular & Biomolecular Spectroscopy. Apr2016, Vol. 159, p90-97. 8p.
Subjects: Molecular structure, Infrared spectroscopy, Mineralogy, Crystal structure, Cobalt hydroxides
Abstract: Heterogenite is commonly referred in mineralogy literature as a cobalt oxy-hydroxide CoO(OH). However, detailed analysis of Raman and infrared spectra acquired on particularly well-crystallized natural samples of heterogenite suggests that the mineral can be characterized by a delafossite-type structure, with a general chemical formula ABO 2 . Indeed, the Raman spectrum of heterogenite, along the one with grimaldiite (HCrO 2 ), lacks visible free OH-group vibrational modes, while the infrared spectrum shows strong hydrogen bond absorption bands. HCoO 2 is thus a better formulation of heterogenite that describes more clearly its vibrational behavior and avoids the confusion in literature. Electronic backscattered diffraction (EBSD) is then used to distinguish and map the 2H and 3R heterogenite natural polytypes for the first time. The comparison of EBSD and Raman mappings clearly indicates that the 2H polytype is characterized by an additional peak at 1220 cm − 1 . The presence/absence is therefore an efficient tool to distinguish both polytypes. [ABSTRACT FROM AUTHOR]
Copyright of Spectrochimica Acta Part A: Molecular & Biomolecular Spectroscopy is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Heterogenite is commonly referred in mineralogy literature as a cobalt oxy-hydroxide CoO(OH). However, detailed analysis of Raman and infrared spectra acquired on particularly well-crystallized natural samples of heterogenite suggests that the mineral can be characterized by a delafossite-type structure, with a general chemical formula ABO 2 . Indeed, the Raman spectrum of heterogenite, along the one with grimaldiite (HCrO 2 ), lacks visible free OH-group vibrational modes, while the infrared spectrum shows strong hydrogen bond absorption bands. HCoO 2 is thus a better formulation of heterogenite that describes more clearly its vibrational behavior and avoids the confusion in literature. Electronic backscattered diffraction (EBSD) is then used to distinguish and map the 2H and 3R heterogenite natural polytypes for the first time. The comparison of EBSD and Raman mappings clearly indicates that the 2H polytype is characterized by an additional peak at 1220 cm − 1 . The presence/absence is therefore an efficient tool to distinguish both polytypes. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Spectrochimica Acta Part A: Molecular & Biomolecular Spectroscopy is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.saa.2016.01.038
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        Type: general
      – SubjectFull: Infrared spectroscopy
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      – SubjectFull: Mineralogy
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      – SubjectFull: Crystal structure
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      – TitleFull: Delafossite structure of heterogenite polytypes (HCoO2) by Raman and infrared micro-spectroscopy.
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              Text: Apr2016
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