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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 38, Number 2
JKCSEZ 38(2)
April 20, 1994 

Preparation of Cobalt-Substituted Iron Oxide Powder from Organometallic Precursors (Ⅱ)

유기금속 전구체로부터 코발트 치환 산화철 분말 제조 (Ⅱ)
Jeong-Soo Kim, Han-Chyul Kang, Yang-Ki Hong

김정수, 강한철, 홍양기
초미립 코발트 치환 산화철 분말을 새로운 유기금속 전구체인 CoxFe1-x(N2H3COO)2(N2H4)2 (x = 0, 0.01, 0.02, 0.03, 0.05, 0.10, 1.00)을 열분해화 산화과정으로 제조하였다.유기금속 전구체는 몰비 x : 1-x인 Co(Ⅱ)와 Fe(Ⅱ)를 hydrazinocarboxylic acid와 반응시켜서 합성하였고, 합성을 정량분석, 및 적외선분광기를 사용하며, 합성을 정량분석, 원소분석 및 적외선분광기를 사용하여 확인하였다. 유기금속 전구체의 열분해 과정은 TG-DTG 와 DSC로 살펴보았다. 코발트치환 산화철 분말은 유기금속 전구체를 대기 중에서 350℃ 와 450℃에서 6시간 열처리하여 제조하였다. 산화철의 결정상은 각각 γ-Fe2O3 및γ-Fe2O3와 α-Fe2O3의 혼합상이었다. 입자의 형태는 구형에 가까운 모양이었고 크기는 0.05μm 이하의 초미립이었다. 코발트 치환 산화철의 보자력과 각형비는 코발트 함량 또는 열처리 온도가 높아질 수록 증가하였다.

Ultrafine cobalt-substituted iron oxide particles were prepared by the thermal decomposition and oxidation of the new organometallic precursor, CoxFe1-x(N2H3COO)2(N2H4)2 (x = 0, 0.01, 0.02, 0.03, 0.05, 0.10, 1.00). The organometallic precursors were synthesized by the reaction of Co(Ⅱ) and Fe(Ⅱ) ion in a mole ratio of x : 1-x with hydrazinocarboxylic acid, and characterized by quantitative analysis, elemental analysis and infrared spectroscopy. The mechanistic study on the thermal decomposition of the organometallic precursors was performed by TG-DTG and DSC. The cobalt-substituted iron oxide particles were obtained by the heat treatment of the precursors at 350℃ and 450℃ for six hours in air. The prepared iron oxide was found to have two phases such as γ-Fe2O3 and a mixture of γ-Fe2O3 and α-Fe2O3 at 350℃ and 450℃ respectively. The particle shape was equiaxial and the particle size was less than 0.05 μm. The coercivity and squareness of the cobalt substituted iron oxide particles increased with increasing cobalt content. Both coercivity and squareness showed higher values at 450℃

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