R1: Characterization and description of minerals

[R1-02] An estimate of electric field gradient tenosr of Fe²⁺ in M2 site of augite by Mössbauer microspectroscopy

*Daiki Fukuyama¹, Keiji Shinoda¹, Yasuhiro Kobayashi² (1. Osaka City Univ., 2. KURNS)

Keywords:Augite, Mössbauer spectroscopy, Electric field gradient tensor

Intensities of component peaks in the quadrupole doublet of Mössbauer spectra of a single crystal vary depending on the direction of the γ-ray and the crystallographic orientation of thin section. Intensities of quadruple doublets is related to the electric field gradient (EFG) tensor of sites Mössbauer unlecleus. The EFG tensor of Fe²⁺ in M2 site of clinopyroxene is not solved. In this study the EFG tensor of the M2 site of C2/c clinopyroxene was determined from three crystallographically oriented thin sections prepared by X-ray diffraction using precession camera.