TY - JOUR
T1 - Nanostructured magnetoceramics from hyperbranched polymer precursors
AU - Sun, Qunhui
AU - Xu, Kaitian
AU - Lam, Jacky W.Y.
AU - Cha, John A.K.
AU - Zhang, Xixiang
AU - Tang, Ben Zhong
N1 - Funding Information:
The work was partially supported by the Research Grants Council of the Hong Kong Special Administrative Region, China (Project Nos. HKUST6187/99P, 6062/98P, and 6149/97P) and the Joint Laboratory for Nanostructured Materials and Technology between the Chinese Academy of Sciences and the Hong Kong University of Science and Technology.
PY - 2001/10/20
Y1 - 2001/10/20
N2 - Controlled pyrolysis of a hyperbranched polysilyne, poly[1,1'-ferrocenylene(methyl)silyne] (1), at high temperature in inert atmosphere produces nonostructured ceramics (2) in ~ 48-62% yields. The ceramic products 2 are characterized by SEM, XPS, EDX, XRD, and SQUID. It is found that the ceramics are electrically conductive and possess a mesoporous architecture. The iron contents of 2 estimated by EDX are 36-43%. The nanocrystals formed in the ceramics produced under nitrogen 2N are mainly α-Fe2O3 whereas those in the ceramics produced under argon 2A are mainly Fe3Si. When magnetized by an external field at room temperature, 2A exhibits a high saturation magnetization (Ms ~ 49 emu/g) and near-zero remanence and coercivity.
AB - Controlled pyrolysis of a hyperbranched polysilyne, poly[1,1'-ferrocenylene(methyl)silyne] (1), at high temperature in inert atmosphere produces nonostructured ceramics (2) in ~ 48-62% yields. The ceramic products 2 are characterized by SEM, XPS, EDX, XRD, and SQUID. It is found that the ceramics are electrically conductive and possess a mesoporous architecture. The iron contents of 2 estimated by EDX are 36-43%. The nanocrystals formed in the ceramics produced under nitrogen 2N are mainly α-Fe2O3 whereas those in the ceramics produced under argon 2A are mainly Fe3Si. When magnetized by an external field at room temperature, 2A exhibits a high saturation magnetization (Ms ~ 49 emu/g) and near-zero remanence and coercivity.
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U2 - 10.1016/S0928-4931(01)00302-2
DO - 10.1016/S0928-4931(01)00302-2
M3 - Article
AN - SCOPUS:0035922740
SN - 0928-4931
VL - 16
SP - 107
EP - 112
JO - Materials Science and Engineering C
JF - Materials Science and Engineering C
IS - 1-2
ER -