Local electronic structure of calcite investigated using X-ray absorption spectroscopy at different span of time

Title
Local electronic structure of calcite investigated using X-ray absorption spectroscopy at different span of time
Authors
채근화심철휘씽 바르샤Jitendra Pal SinghSangsul Lee
Keywords
Calcite; Local Electronic Structure; Coordination Number; Ageing Effect
Issue Date
2020-11
Publisher
Journal of nanoscience and nanotechnology
Citation
VOL 20-6717
Abstract
For the present work, calcite nanoparticles was synthesized from calcium nitrate by annealing precursor at 300, 400, 500 and 600 C. Ca K -edge near edge X-ray absorption fine structure measurements revealed spectral features characteristics to the amorphous phase of calcium carbonate at 300 and 400 C. At 500 and 600 C, the spectra were analogues to the calcite phase of calcium carbonate. Simulation of extended X-ray absorption fine structure spectra envisaged that both coordination number and bond distance for Ca?O bonds decreased with annealing temperature. Both parameters attained values close to standard calcite when annealed at 600 C. The spectral features at Ca L-, O K - and C K -edge near edge X-ray absorption fine structure appeared at same positions for different ages, which envisaged the occurrence of almost same local electronic structure for different span of times.
URI
http://pubs.kist.re.kr/handle/201004/72222
ISSN
1533-4880
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