Nanostructured magnetoceramics from hyperbranched polymer precursors

Qunhui Sun; Kaitian Xu; Jacky W.Y. Lam; John A.K. Cha; Xixiang Zhang; Ben Zhong Tang

doi:10.1016/S0928-4931(01)00302-2

Nanostructured magnetoceramics from hyperbranched polymer precursors

Qunhui Sun, Kaitian Xu, Jacky W.Y. Lam, John A.K. Cha, Xixiang Zhang, Ben Zhong Tang^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

21 Scopus citations

Abstract

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 (M_s ~ 49 emu/g) and near-zero remanence and coercivity.

Original language	English (US)
Pages (from-to)	107-112
Number of pages	6
Journal	Materials Science and Engineering C
Volume	16
Issue number	1-2
DOIs	https://doi.org/10.1016/S0928-4931(01)00302-2
State	Published - Oct 20 2001
Externally published	Yes

Bibliographical note

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.

Keywords

Ceramics
Ferromagnetic materials
Hyperbranched polymers
Nanoclusters
Polymer precursors
Polysilynes

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1016/S0928-4931(01)00302-2

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title = "Nanostructured magnetoceramics from hyperbranched polymer precursors",

abstract = "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.",

keywords = "Ceramics, Ferromagnetic materials, Hyperbranched polymers, Nanoclusters, Polymer precursors, Polysilynes",

author = "Qunhui Sun and Kaitian Xu and Lam, {Jacky W.Y.} and Cha, {John A.K.} and Xixiang Zhang and Tang, {Ben Zhong}",

note = "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.",

year = "2001",

month = oct,

day = "20",

doi = "10.1016/S0928-4931(01)00302-2",

language = "English (US)",

volume = "16",

pages = "107--112",

journal = "Materials Science and Engineering C",

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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.

KW - Ceramics

KW - Ferromagnetic materials

KW - Hyperbranched polymers

KW - Nanoclusters

KW - Polymer precursors

KW - Polysilynes

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DO - 10.1016/S0928-4931(01)00302-2

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SN - 0928-4931

VL - 16

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JO - Materials Science and Engineering C

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IS - 1-2

ER -

Nanostructured magnetoceramics from hyperbranched polymer precursors

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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