Effect of precursor thermal history on the formation of amorphous and crystalline calcium carbonate

The role of the thermal history of the precursor was studied for amorphous and crystalline calcium carbon- ate phases synthesized from calcium nitrate. The X-ray diffraction patterns of these phases are influenced by their annealing temperature of 0, 300, 400, and 500 ℃. However, the effect of the p...

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Bibliographic Details
Published inParticuology Vol. 33; no. 4; pp. 29 - 34
Main Authors Singh, Jitendra Pal, Ji, Mi-Jung, Shim, Cheol-Hwee, Kim, Sang Ok, Chae, Keun Hwa
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.08.2017
Subjects
Amorphous material
Calcium carbonate
Electron microscopy
NEXAFS
Particles
X-ray techniques
前驱体
热历史
电子显微镜观察
电子结构
碳酸钙晶体
近边X射线吸收精细结构
退火温度
非晶态
Amorphous material
NEXAFS
Electron microscopy
X-ray techniques
Particles
Calcium carbonate
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Summary:The role of the thermal history of the precursor was studied for amorphous and crystalline calcium carbon- ate phases synthesized from calcium nitrate. The X-ray diffraction patterns of these phases are influenced by their annealing temperature of 0, 300, 400, and 500 ℃. However, the effect of the precursor thermal history on the X-ray diffraction pattern of the resulting calcium carbonate phase is negligible. Transmis- sion electron microscopy indicates that materials annealed at 400 ℃ consist of amorphous aggregates, irrespective of the precursor thermal history. The crystallite size of crystalline calcium carbonate is influ- enced by the precursor thermal history, and ranges from 23 to 26 rim. Near-edge X-ray absorption fine structure measurements indicate that the annealing temperature plays an important role in determining the local electronic structure. The role of the thermal history of the precursor is also important for the resultinu electronic structure.
Bibliography:11-5671/O3
Amorphous material Particles Electron microscopy X-ray techniques NEXAFS Calcium carbonate
The role of the thermal history of the precursor was studied for amorphous and crystalline calcium carbon- ate phases synthesized from calcium nitrate. The X-ray diffraction patterns of these phases are influenced by their annealing temperature of 0, 300, 400, and 500 ℃. However, the effect of the precursor thermal history on the X-ray diffraction pattern of the resulting calcium carbonate phase is negligible. Transmis- sion electron microscopy indicates that materials annealed at 400 ℃ consist of amorphous aggregates, irrespective of the precursor thermal history. The crystallite size of crystalline calcium carbonate is influ- enced by the precursor thermal history, and ranges from 23 to 26 rim. Near-edge X-ray absorption fine structure measurements indicate that the annealing temperature plays an important role in determining the local electronic structure. The role of the thermal history of the precursor is also important for the resultinu electronic structure.
ISSN:1674-2001
2210-4291
DOI:10.1016/j.partic.2016.10.003