BaO2-TiO2-환원제-입자제어제계에서 자전연소합성법에 의한 BaTiO3 분말의 제조 및 유전특성

다국어 초록 (Multilingual Abstract)

We have investigated on the preparation of BaTiO3 powder at the system of BaO2-TiO2-Reduction ag.-PSCA by SHS. C and Mg were used as reduction agent, and NaCl was used as PSCA(Particle Size Control Agent). The effects of the various reduction agent and its concentration, particle size control agent, reaction mixture mass on the product in the preparation of BaTiO3 powder at the optimum system by SHS were investigated. The optimum conditions for reaction system and composition were BaO2+TiO2+0.11Mg+0.2C+0.75NaCl in the Ar atmosphere. NaCl as PSCA showed the effect of controlling the particle size of product as well as the combustion temperature. The particle size of BaTiO3 synthesized at the optimum condition was about 0.5㎛. And as the mixture mass for the reaction was increased, the more stable combustion wave appeared. We have conducted the sintering experiment at the temperature of 1300℃, the time of 2 hours and the atmosphere of air to measure the dielectric properties of BaTiO3 synthesised in this work, and the sample sintered in this condition showed 2,290 of dielectric constant at 100℃ and 13,890 at curie point(129℃).

참고문헌 (Reference)

1 "mechanism of combustion and phase formation in the BaO2-TiO2-organic compound system" 18 (18): 1926-1933, 2003

2 "Synthesis and characteristics of LiCoO2 powders prepared by SHS process" 41 : 388-394, 2004

3 "Reviews : Fundamentals, achievements and perspectives for development of Solid-flame combustion" 46 : 1997

4 "Preparation of α-Si3N4 powder in reaction system containing molten salt by SHS-part 1. Synthesis of powder" 41 (41): 235-241, 2004

5 "Preparation and sintering of Alumina-Titanium carbide composite powder by Self-propagating High-temperature synthesis" 1998

6 "Preparation and properties of (Ba0,7Sr0,3)TiO3 powders and thin films using precursor solutions formed from alkoxide-hydroxide" 19 : 1011-, 1999

7 "New routes in the Self-propagating High-temperature Synthesis of barium titanium oxide" 15 : 1349-1353, 1996

8 "Macrokinetic aspects of SHS as studied by thermochemical analysis Thermochemistry of SHS from 'Thermo' program"

9 "Low-temperature synthesis and processing of electric materials in the BaO-TiO2 system" -83, 1990

10 "Hydrothermal synthesis of tetragonal barium titanate from barium hydroxide and titanium dioxide under moderate conditions" 82 (82): 3254-3256, 1999

11 "Hydrothermal synthesis and dielectric properties of tetragonal BaTiO3" 6 (6): 1542-1548, 1994

12 "Fabrication of porous MoSi2 material for heating element through Self-propagating High-temperature Synthesis process" 41 (41): 62-68, 2004

13 "Dielectric materials for sintering in reducing atmospheres" 21 : 1637-1642, 2001

14 "Combustion of TiO2-Mg and TiO2-Mg-C systems in the presence of NaCl to synthesize nanocrystalline Ti and TiC powders" 38 (38): 1135-1146, 2003

15 "Characteristics of BaTiO3 powders synthesized by hydrothermal process" 35 : 4271-4274, 2000

16 "BaTiO3 properties and powder characteristics for ceramic capacitors" 3 (3): 41-47, 2002