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湖南地方 干拓地 및 內陸土壤의 粘土鑛物에 關한 硏究(Ⅱ)
丁學鎭,金一斗,丁梧鎭 조선대학교 기초과학연구소 1979 自然科學硏究 Vol.2 No.1
A study on the kinds of clay minerals and their geneosis in Hampyoung, Muan series, and cultivating reclaimed land and noncultivating reclaimed land Youngkwang series in the western and southern parts of Korea was carried out by chemical analysis, X-ray diffraction, differential thermal analysis and mineral micrography. The following results were obtained ; 1. In Hampyoung silt clay loam due to Low Humic Cleil soils, the minerals were kaoline, illit and vermiculite. The secondary micerals were quartz, chlorite and gibbstite. A small amount of montmorillorinite was identified in the deep soil. 2. In Muan silt clay loam due to Red Yellow soils, the main mineral was kaoline. The secondary minerals were vermiculite, illite, chlorite and quartz. Especially, a small amount cf gibbsite was identified in the top soil and a small amount of hematite was identified in the deep soil. 3. In cultivating reclaimed land (C groups) and noncultivating reclaimed land (D groups) Youngkwang series, the main minerals were kaolin, illite and vermiculite. The secondary minerals were quartz, chlorite and gibbsite. 3. A composition ratio of clay menerals at cultivating reclaimed land and noncultivating land was nearly constant but the least small amount of kaoline was detected at the top soil of C groups. 4. The clay minerals of latice distance, 7.2-7.4 Å and 3.35-4.27 Å, on the X-ray diffractometer with all soils. Especially, an amount of kaoline among them was abundant but kaoline was apperared much from the deep soil than from the top soil. 5. We could deduce kaoline by endothermic peak (540-570℃) and exothermic peak (920-970℃). This kaoline was deduced with halloysite. 6. The ratio ; SiO_2/Al_2O_3 and exchange capacity of cations in soils were deteted much more from noncultivating reclaimed land than from other soils.
MnCO_3 熱分解時 生成된 α-Mn_2O_3 및 r-Mn_2O_3의 示差熱曲線에 對한 考察
丁學鎭,金一斗,丁梧鎭 조선대학교 기초과학연구소 1978 自然科學硏究 Vol.1 No.1
Each transformation temperature of manganeseoxide produced when MnCO_3 is decomposed by heat, and various modifications of Mn_2O_3 have been studied with the differential thermal curves of the D.T.A. If MnCO_3 was heated in air, the intermediate products such as MnO, MnO_2 and Mn_2O_3 were produced at about 100℃, 410℃∼610℃ and 650℃∼850℃ respectively, and Mn_2O_3 was transformed into Mn_3O_4 at 850℃∼890℃, and then Mn_3O_4 maintained the minimum energy state. The transformation temperature of the modifications are as follows : α-Mn_2O_3(890℃∼970℃) ̄→Mn_3O_4, ??-Mn_2O_3(610℃∼710℃) ̄→α-Mn_2O_3(785℃∼890℃) ̄→Mn_3O_4. The more the amount of the given samples, the higher the restoration temperatures of transformation. The maximum temperatures, however, were kept relatively constant. The differential thermal curve of α-Mn_2O_3 showed a small peak, while that of ??-Mn_2O_3 showed a sharp and broad peak.