Synthesis of Zn-intermediate from alkali agents and its transformation to ZnO crystallinity (알칼리 침전제에 의해 제조된 아연 중간생성물 및 산화아연 결정화)

Dae-Hwan Jang (장대환); Boram Kim (김보람); Kim Dae Weon (김대원)

doi:10.6111/JKCGCT.2021.31.6.270

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

Journal of the Korean Crystal Growth and Crystal Technology
Abbr : J. Korean Cryst. Growth Cryst. Technol.
2021, 31(6), pp.270~275
DOI : 10.6111/JKCGCT.2021.31.6.270
Publisher : The Korea Association Of Crystal Growth, Inc.
Research Area : Engineering > Materials Science and Engineering
Received : October 14, 2021
Accepted : November 4, 2021
Published : December 31, 2021

Dae-Hwan Jang ¹, Boram Kim ¹, Kim Dae Weon ²

¹고등기술연구원
²고등기술연구원연구조합

Accredited

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 andZn5(OH)6(CO3)2·H2O as a Zn-intermediate were calcined at 400°C and 800°C 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°C, and was completely thermally decomposed at 800°C 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°C. 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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