Effect of precursor thermal history on the formation of amorphous and crystalline calcium carbonate
Effect of precursor thermal history on the formation of amorphous and crystalline calcium carbonate作者机构：Advanced Analysis Center Korea Institute of Science and Technology Seou102792 Republic of Korea Department of Biomedical Engineering Seonam University Namwon 55724 Republic of Korea
出 版 物：《Particuology》 (颗粒学报（英文版）)
年 卷 期：2017年第15卷第4期
页 面：29-34页
核心收录：
学科分类：0710[理学-生物学] 080503[工学-材料加工工程] 07[理学] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 071002[理学-动物学]
基 金：supported by the Korea Institute of Science and Technology Seoul Korea (KIST)
主 题：Amorphous material Particles Electron microscopy X ray techniques NEXAFS Calcium carbonate
摘 要：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.
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