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http://dx.doi.org/10.6111/JKCGCT.2021.31.6.270

Synthesis of Zn-intermediate from alkali agents and its transformation to ZnO crystallinity  

Jang, Dae-Hwan (Advanced Materials and Processing Center, Institute for Advanced Engineering (IAE))
Kim, Bo-Ram (Advanced Materials and Processing Center, Institute for Advanced Engineering (IAE))
Kim, Dae-Weon (Advanced Materials and Processing Center, Institute for Advanced Engineering (IAE))
Publication Information
Journal of the Korean Crystal Growth and Crystal Technology / v.31, no.6, 2021 , pp. 270-275 More about this Journal
Abstract
ZnO was synthesized according to the transformation behavior and crystallization conditions of Zn-intermediate obtained by zinc sulfate as a precursor and NaOH, Na2CO3 as a alkali agents. For ZnO crystallization, Zn4(OH)6SO4·H2O and Zn5(OH)6(CO3)2·H2O as a Zn-intermediate were calcined at 400℃ and 800℃ for 1 h, respectively, based on decomposition temperature from TGA. Zn4(OH)6SO4·H2O was confirmed to have mixed Zn4(OH)6SO4·H2O and ZnO at 400℃, and was completely thermally decomposed at 800℃ to form ZnO phase. The prepared Zn5(OH)6(CO3)2·H2O as a Zn-intermediate by the reaction with Na2CO3 was transformed to a complete ZnO crystallization over 400℃. Nano-sized ZnO can be synthesized at a relatively lower calcination temperature through the reaction with Na2CO3.
Keywords
Zn-intermediate; Alkali agent; ZnO; Crystallinity; Phase transformation;
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