EPR/FMR, FTIR, X-Ray and Raman Investigations of Fe-Doped SiCN Ceramics

被引：20

作者：

Andronenko, S. I. ^{[2
]}

Stiharu, I. ^{[2
]}

Menard, D. ^{[3
]}

Lacroix, C. ^{[3
]}

Misra, Sushil K. ^{[1
]}

机构：

[1] Concordia Univ, Dept Phys, Montreal, PQ H3G 1M8, Canada

[2] Concordia Univ, Dept Mech & Ind Engn, CONCAVE Res Ctr, Montreal, PQ H3G 1M8, Canada

[3] Ecole Polytech, Dept Genie Phys, Montreal, PQ H3C 3A7, Canada

来源：

APPLIED MAGNETIC RESONANCE | 2010年 / 38卷 / 04期

基金：

加拿大自然科学与工程研究理事会;

关键词：

FREE-CARBON PHASE; C-N CERAMICS; POLYSILAZANE PRECURSORS; MAGNETIC-PROPERTIES; PLASMA POLYMERIZATION; SILICON CARBONITRIDE; PYROLYSIS CHEMISTRY; FILMS; CRYSTALLIZATION; NANODOMAINS;

D O I：

10.1007/s00723-010-0120-5

中图分类号：

O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];

学科分类号：

070203 ; 070304 ; 081704 ; 1406 ;

摘要：

SiCN magnetic ceramics doped with Fe ions were synthesized at different pyrolysis temperatures in the range from 600 to 1600A degrees C. Several phases of ceramics were detected using the techniques of electron paramagnetic resonance/ferromagnetic resonance, Raman, Fourier-transform infrared and X-ray diffractometry, listed as follows: (a) transformation to the ceramic state from the polymer state, where the Fe ions are in the paramagnetic state, as the temperature is increased from 600 to 800A degrees C; (b) formation of two different Fe species in the range of 950-1150A degrees C: nanocrystalline particles in the ferromagnetic state and Fe ions incorporated into the free-carbon state in the superparamagnetic state; (c) diminution of the free-carbon content above 1150A degrees C, and, as a consequence, diminution of the intensity of the broad Fe signal related to this phase; (d) appearance of a new Fe phase at about 1200A degrees C; (e) disappearance of the ferromagnetic phase at about 1400A degrees C; (f) disappearance of all Fe ions above 1530A degrees C. The samples exhibiting superparamagnetic behavior are potentially useful in developing high-temperature magnetic sensor devices.

引用

页码：385 / 402

页数：18

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