Effects of excess carbon and vibrational properties in ultrafine SiC powders

被引：25

作者：

Charpentier, S

Kassiba, A

Bulou, A

Monthioux, M

Cauchetier, M

机构：

[1] Univ Maine, Lab Phys Etat Condense, Fac Sci, F-72085 Le Mans 09, France

[2] CEMES, F-31055 Toulouse, France

[3] CEA, DRECAm, Serv Photons Atomes & Mol, F-91191 Gif Sur Yvette, France

来源：

EUROPEAN PHYSICAL JOURNAL-APPLIED PHYSICS | 1999年 / 8卷 / 02期

关键词：

D O I：

10.1051/epjap:1999236

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Structural and vibrational properties are investigated in SiC nanopowders synthesized by a CO2 laser pyrolysis of (SiH4, C2H2) gaseous mixture and thermally treated up to 1800 degrees C. The structural modifications of the SiC crystallites and the arrangement of the carbon in excess are monitored at different annealing stages. A critical behaviour is revealed in the powder annealed at T-a = 1500 degrees C through the features of the Raman spectra and the insulating-conductor transition. The significant electric conductivity (sigma approximate to 0.05 S cm(-1)) which appears above T-a is discussed with respect to the powder composition and the interface effects where the carbon in excess seems to play a key role.

引用

页码：111 / 121

页数：11

共 23 条

[1] MORPHOLOGY AND CRYSTALLINE ORDER IN CATALYTIC CARBONS [J].

AUDIER, M ;

OBERLIN, A ;

OBERLIN, M ;

COULON, M ;

BONNETAIN, L .

CARBON, 1981, 19 (03) :217-224

[2]

Badami D. V., 1965, Carbon, V3, P53, DOI DOI 10.1016/0008-6223(65)90027-8

[3]

BOULANGER L, 1993, 3 EUROCERAMICS, V1, P21

[4] EPR investigations of SiC and SiOC nanometric powders [J].

Charpentier, S ;

Kassiba, A ;

Fusil, S ;

Armand, X ;

Cauchetier, M ;

Fayet, JC ;

Emery, J .

APPLIED MAGNETIC RESONANCE, 1997, 12 (2-3) :255-267

[5] Investigation of the paramagnetic centres and electronic properties of silicon carbide nanomaterials [J].

Charpentier, S ;

Kassiba, A ;

Emery, J ;

Cauchetier, M .

JOURNAL OF PHYSICS-CONDENSED MATTER, 1999, 11 (25) :4887-4897

[6]

CHARPENTIER S, 1998, THESIS U LE MANS FRA

[7] USE OF RAMAN-SCATTERING TO INVESTIGATE DISORDER AND CRYSTALLITE FORMATION IN AS-DEPOSITED AND ANNEALED CARBON-FILMS [J].

DILLON, RO ;

WOOLLAM, JA ;

KATKANANT, V .

PHYSICAL REVIEW B, 1984, 29 (06) :3482-3489

[8] RAMAN SCATTERING IN 6H SIC [J].

FELDMAN, DW ;

PARKER, JH ;

CHOYKE, WJ ;

PATRICK, L .

PHYSICAL REVIEW, 1968, 170 (03) :698-&

[9] RAMAN-SPECTRA OF AMORPHOUS SIC [J].

INOUE, Y ;

NAKASHIMA, S ;

MITSUISHI, A ;

TABATA, S ;

TSUBOI, S .

SOLID STATE COMMUNICATIONS, 1983, 48 (12) :1071-1075

[10]

Karlin S, 1997, J RAMAN SPECTROSC, V28, P219, DOI 10.1002/(SICI)1097-4555(199704)28:4<219::AID-JRS88>3.0.CO

← 1 2 3 →