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Structure and Shape of Hematite Particles Obtained by Oxidative Thermolysis of Iron Oxalate Dihydrate: Anisotropic Broadening of X-Ray Diffraction Peaks Full article

Journal Journal of Structural Chemistry
ISSN: 0022-4766 , E-ISSN: 1573-8779
Output data Year: 2024, Volume: 65, Number: 4, Pages: 655–665 Pages count : 11 DOI: 10.1134/S0022476624040024
Tags hematite, powder X-ray diffraction, planar defects, microtwinning, anisotropic particle shape
Authors Cherepanova S.V. 1,2 , Sinitsa N.A. 2 , Yatsenko D.A. 1,2 , Gerasimov E.Yu. 1 , Sidel’nikov A.A. 3 , Matvienko A.A. 3
Affiliations
1 Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
2 Novosibirsk State University, Novosibirsk, Russia
3 Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia

Funding (1)

1 Russian Science Foundation
Правительство Новосибирской области 		23-23-10086

Abstract: Hematite obtained by oxidative thermolysis of iron oxalate dihydrate at temperatures from 320 °C to 680 °C is analyzed by in situ powder X-ray diffraction (XRD) and transmission electron microscopy. XRD patterns of hematite demonstrate the anisotropic broadening of the peaks. The width and difference in the broadening of XRD peaks decrease with increasing annealing temperature. The calculation of XRD patterns based on statistical models of 1D disordered crystals reveals the XRD effects induced by stacking faults (SFs) in anionic and cationic sublattices. It is shown that SFs in the anionic sublattice broaden and shift 012, 104, 024, 018, 214 peaks. In the cationic sublattice, they also broaden the mentioned peaks but do not affect their positions. The width of 110, 113, 116, and 300 peaks does not depend on SFs in the cationic sublattice and is used to determine the particle shape. The anisotropic broadening of XRD peaks is shown to be caused by both particle shape anisotropy and SFs in the cationic sublattice. Average sizes of hematite particles in the [001] direction are approximately 2 times smaller than those in the perpendicular direction. As the temperature increases, the SF concentration gradually decreases from 0.035 °C at 320 °C to 0 °C at 560 °C.
Cite: Cherepanova S.V. , Sinitsa N.A. , Yatsenko D.A. , Gerasimov E.Y. , Sidel’nikov A.A. , Matvienko A.A.
Structure and Shape of Hematite Particles Obtained by Oxidative Thermolysis of Iron Oxalate Dihydrate: Anisotropic Broadening of X-Ray Diffraction Peaks
Journal of Structural Chemistry. 2024. V.65. N4. P.655–665. DOI: 10.1134/S0022476624040024 WOS Scopus РИНЦ AN OpenAlex
Original: Черепанова С.В. , Синица Н.А. , Яценко Д.А. , Герасимов Е.Ю. , Cидельников А.А. , Матвиенко А.А.
Структура и форма частиц гематита, полученного окислительным термолизом дигидрата оксалата железа: анизотропное уширение рентгеновских дифракционных пиков
Журнал структурной химии. 2024. Т.65. №4. 124535 . DOI: 10.26902/JSC_id124535 РИНЦ OpenAlex
Dates:
Submitted: Nov 21, 2023
Accepted: Dec 7, 2023
Published print: Apr 1, 2024
Published online: May 21, 2024
Identifiers:
Web of science: WOS:001228911800005
Scopus: 2-s2.0-85193585353
Elibrary: 67305326
Chemical Abstracts: 2024:1234774
OpenAlex: W4398168420
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