Two dimensional X-Ray diffraction (2D-XRD) studies on olivine of U.S.A | [Journal of Chemical Society of Pakistan • 2011]

Author(s):

1. Salma JABEEN: Department of Physics, University of Balochistan, Quetta, PAKISTAN

2. Syed Mohsin RAZA: Department of Physics, University of Balochistan, Quetta, PAKISTAN

3. Muhammad Ashfaq AHMED: Department of Physics, University of Balochistan, Quetta, PAKISTAN

4. Masoom YASIN-ZAI: Institute of Biochemistry, University of Balochistan, Quetta, Pakistan

5. Kurt Erlacher: XRD Division Bruker’s Labs, Germany

Abstract:

The Olivine (Mg, Fe) 2SiO4 of USA has been studied with two dimensional X-ray diffracto meter (D8 discover with GADDS). The two distinct phases of orthorhombic structure, one with Mg8 [Fe2 SiO4] and the other with Mg2 SiO4 is observed. We also observed phase transitions due to presence of iron and Silicon preferably the structural change of Mg8[Fe2 SiO4] from orthorhombic to spinnel like (spinnel chord) structure. Magnesium ions in Mg8[Fe2 SiO4] shuffle, arrange at the five vertices of a pentagon and the remaining three at the central but with displaced position from the plane of the pentagon, Thus resulting into a three dimensional spinnel chord like structure. We evidenced the same from diverse orientations of phase peaks and indeed from Kossel lines.

Page(s): 612-618

DOI: DOI not available

Published: Journal: Journal of Chemical Society of Pakistan, Volume: 33, Issue: 5, Year: 2011

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