Structure and properties of boron carbide with aluminum incorporation

被引：44

作者：

Liu, CH ^{[1
]}

机构：

[1] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY | 2000年 / 72卷 / 01期

基金：

中国国家自然科学基金;

关键词：

B-C-Al; ternary compounds; x-ray diffraction analyses;

D O I：

10.1016/S0921-5107(99)00597-8

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

B-C-Al ternary compounds were prepared by hot-pressing of the boron carbide (B(4.3)C) and Al powder at 1820 degrees C and 45 MPa under argon atmosphere, with Al content in the range from 5 wt% to 20 wt%. X-ray diffraction analyses indicated that the main phase was B(11)C(3)Al with an enlarged boron carbide structure. Studies revealed the Al atoms located at the central sites of the chain units. With the increase of Al concentration the Al(8)B(4)C(7) phase emerged. The thermoelectric properties of the samples were investigated as a function of temperature between 300 and 550 K. Al-containing boron carbide exhibited lower electric conductivities and thermal conductivities compared with that of the pure boron carbide. Proper amount of Al incorporation (5 wt%) resulted in remarkable increase of the Seebeck coefficient and an order of magnitude increase of the figure of merit Z compared to that of pure boron carbide was achieved at room temperature. (C) 2000 Elsevier Science S.A. All rights reserved.

引用

页码：23 / 26

页数：4

共 10 条

[1] STRUCTURE AND SINGLE-PHASE REGIME OF BORON CARBIDES [J].

EMIN, D .

PHYSICAL REVIEW B, 1988, 38 (09) :6041-6055

[2]

EMIN D, 1990, NATO ADV SCI I E-APP, V185, P691

[3]

KIMURA K, 1995, P 5 INT C QUAS WORLD, P72

[4] ON THE MICROSTRUCTURE OF BORON-CARBIDE [J].

KUHLMANN, U ;

WERHEIT, H .

SOLID STATE COMMUNICATIONS, 1992, 83 (11) :849-852

[5] DISTRIBUTION OF CARBON-ATOMS ON THE BORON-CARBIDE STRUCTURE ELEMENTS [J].

KUHLMANN, U ;

WERHEIT, H ;

SCHWETZ, KA .

JOURNAL OF ALLOYS AND COMPOUNDS, 1992, 189 (02) :249-258

[6] Structures of the boron-rich boron carbides from neutron powder diffraction: Implications for the nature of the inter-icosahedral chains [J].

Kwei, GH ;

Morosin, B .

JOURNAL OF PHYSICAL CHEMISTRY, 1996, 100 (19) :8031-8039

[7] UBER EIN ALUMINIUMHALTIGES BORCARBID [J].

LIPP, A ;

RODER, M .

ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE, 1966, 343 (1-2) :1-&

[8] PREPARATION AND STRUCTURE OF ALUMINUM CONTAINING BORON CARBIDE [J].

NEIDHARD, H ;

MATTES, R ;

BECHER, HJ .

ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL CRYSTALLOGRAPHY AND CRYSTAL CHEMISTRY, 1970, B 26 :315-+

[9] IR active phonon spectra of B-C-Al compounds with boron carbide structure [J].

Schmechel, R ;

Werheit, H ;

Robberding, K ;

Lundstrom, T ;

Bolmgren, H .

JOURNAL OF SOLID STATE CHEMISTRY, 1997, 133 (01) :254-259

[10]

WERHEIT H, 1990, NATO ADV SCI I E-APP, V185, P677

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