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Synthesis of Nano-crystalline Pyrite FeS2 By Mechanical Alloying: Structural, Microstructural, Hyperfine and Optical Investigations.

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Synthesis of Nano-crystalline Pyrite FeS2 By Mechanical Alloying:

Structural, Microstructural, Hyperfine and Optical Investigations.

Authors

Sifi Ghrieb, Abdelmalik Djekoun, Abderrahim Benabbas, Naouam Boudinar, Mohamed Benabdeslem, Bouguerra Bouzabata

Publication date

2017/5/1

Journal

RESEARCH JOURNAL OF PHARMACEUTICAL BIOLOGICAL AND CHEMICAL SCIENCES

Volume 8 Issue 3 Pages 2147-2156 Publisher

RJPBCS RESEARCH JOURNAL PHARMACEUTICAL, BIOLOGICAL & CHEMICAL SCIENCES

Description

Nanostructured pure FeS2 (Pyrite) powders have been prepared from metallic iron and sulphur, using high energy planetary ball-mill. Changes in structural, morphological, hyperfine and optical properties of the powders during mechanical alloying have been examined by X-ray diffraction, scanning electron microscopy, Fe Mossbauer spectroscopy and spectrophotometry. Reducing the reaction time was challenged by optimizing milling speed and milling intervals duration. This attempt was successfully achieved down to12 h for obtaining pure pyrite phase. Its lattice parameter has been found to increase up to 5.460(3 A) after 72 hours of milling in relation with the growing creation of defects in the

structure. After 24 hours milling, crystallite size saturates around 60 nm while root-mean-square strain exhibits small fluctuations around 0.07 %. The powder microstructure has the aspect of agglomeration of refined micro …

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