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- Title
Composite Fayalite with 5% Laterite Soil and Iron Sand: Structural Properties and Band Gap Calculation Based on Theoretical Kubelka–Munk, Taylor Expansion, and Self-Consistent Field Method.
- Authors
Heryanto, Heryanto; Tahir, Dahlang
- Abstract
The fayalite structure is successfully extracted from nickel slag. The iron sand (IS) and laterite soil (LS) dopant inserted into fayalite system will lead to a significant modification of the crystallite size, crystallinity, and band gap. The composite is prepared by using mechanical alloying method and acidic treatment. X-ray diffraction and UV–Vis spectroscopy are used to reveal the crystallite size, crystallinity, and band gap, respectively. The band gap is inversely proportional to crystallinity and crystallite size, which shows the inconsistency to the band gap changes as contributed from the crystal defect orientation. The Tauc plot with Taylor expansion and self-consistent field methods successfully repaired overlapping UV–Vis absorption spectra for determining the band gap. The band gap values of the fayalite doped by LS are 3.945 ± 0.17 eV and 3.560 ± 0.14 eV for those doped by IS, which are in the middle values of previously reported studies.
- Subjects
SELF-consistent field theory; BAND gaps; TAYLOR'S series; LATERITE; CRYSTAL defects; PHONONIC crystals
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2023, Vol 75, Issue 12, p5264
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-023-05828-0