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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 15, Number 5
JKCSEZ 15(5)
October 20, 1971 

The Study of Analytical Chemistry of the Modification of Manganese Dioxide (Report one). The Study of α,β,γ and δ-MnO2 by Differential Heating Curves

변태이산화망간의 분석화학적 연구 (제1보). α,β,γ 및 δ-MnO2 의 시차열곡선에 대한 고찰
Kim Chan Ho

시차열곡선으로 이산화망간의 각상태를 분석화학적인 면에서 검사하였다. 각상태의 전이온도는 α,β-MnO2인 경우 580℃∼650℃였고, γ-MnO2인 경우 405℃~605℃, δ-MnO2인 경우 860℃~875℃였으며 흡열 peak를 나타냈다. 전이가 완결되는 회복점의 온도는 시료의 양에 따라서 달랐으나 Tmax점의 온도는 거의 일정하였다. peak의 모양은 α,β-MnO2 및 δ-MnO2는 작고 완만하였으며 γ-MnO2는 크고 예민하였다.

Various modifications of manganese dioxide have been discussed in terms of the chemical analysis by differential heating curve. The transformation temperatures of the modifications were observed as follows; α-and β-MnO2 are both 580~650℃, γ-MnO2 is 405℃~605℃ and δ-MnO2is 860~875℃, respectively. Endothermic peaks appeared at the transformation temperatures mentioned above. The restoration temperatures of transformation is completed depending on the amounts of the given samples, but the temperatures of the top of endothermic peaks are nearly constant. The curves of α-, β-MnO2and δ-MnO2 show small peaks while that of γ-MnO2 shows a sharp and broad peak.

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