바륨 티타네이트(IV)

바륨 티타네이트(IV) 속성

바륨 티타네이트(IV) C화학적 특성, 용도, 생산

개요

Barium titanate (BaTiO₃) is an inorganic compound that appears as a white powder but turns transparent when crystallized into larger structures. With its characteristic ABO₃ perovskite lattice, this functional ceramic material serves as a critical raw material for the electronic ceramics industry. Owing to its exceptional ferroelectric, piezoelectric, and dielectric properties, along with high insulation resistance, it is extensively employed in multilayer ceramic capacitors (MLCCs), positive temperature coefficient (PTC) thermistors, optoelectronic devices, and memory components.

Attributing to its ferroelectricity, barium titanate is applied as a semiconductor with positive temperature coefficient of resistivity. It is one of the most important electroceramic materials among all the ferroelectric materials. Barium titanate has also dielectric properties, which can be used in the manufacture of ceramic capacitors. Furthermore, barium titanate has piezoelectric property and can be used in electrical devices such as actuators, accelerators, ultrasonic generators, piezoelectric transducers, filters, and sensors.

화학적 성질

Barium titanate is a white crystalline solid that exists in five crystal modifications. The most common tetragonal form has a Curie point of 120°C and exhibits ferroelectric and piezoelectric properties. It has a density of 6.02 g/cm³ and melts at 1,625°C. This compound is insoluble in water and alkalies, slightly soluble in dilute mineral acids, but dissolves in concentrated sulfuric and hydrofluoric acids.

물리적 성질

Energy Gap:
Eg=3:38 eV(E//c); 3:27 eV(E⊥c).
The energy gap decreases by -4.5×10-4 eV/℃ when the crystal structure becomes cubic at high temperature.
Dielectric Constants:
Saturated Polarizability: 78,000 esu, Dipole Moment: 5×10^-18 esu cm^-3 .

용도

Barium titanate has many important commercial applications. It has both ferroelectric and piezoelectric properties. Also, it has a very high dielectric constant (about 1,000 times that of water). The compound has five crystalline modifications, each of which is stable over a particular temperature range. Ceramic bodies of barium titanate find wide applications in dielectric amplifiers, magnetic amplifiers, and capacitors. These storage devices are used in digital calculators, radio and television sets, ultrasonic apparatus, crystal microphone and telephone, sonar equipment, and many other electronic devices.

제조 방법

Barium titanate is made by sintering a finely powdered mixture of barium carbonate and titanium dioxide in a furnace at 1,350°C. The calcined mass is finely ground and mixed with a binder (plastic). The mixture is subjected to extrusion, pressing or film casting to obtain ceramic bodies of desired shapes. Plastic is burnt off by heating and the shaped body is sintered by firing and then polished.
Barium titanate also may be prepared by other methods. These include ignition of barium and titanium alcoholates in an organic solvent; treatment of tetraethyl titanate or other alkyl ester of titanium with an aqueous solution of barium hydroxide; and ignition of barium titanyloxalate.

일반 설명

Barium titanate(IV) is a ceramic material that can be synthesized by reacting titanium oxide (TiO₂) and barium salts in the presence of oleic acid as a stabilizing agent. It has a cubic crystal structure which allows it to have ferroelectric, thermoelectric and piezoelectric properties. It forms a film with intense photoluminescence which can be used for a wide range of electronic applications.

Structure and conformation

The space lattice of BaTiO 3 takes four types of crystal systems, depending on temperatures. The trigonal crystal (lower than -90℃) shows the spontaneous polarization to the [111] direction.The rhombic crystal (-70℃ to 5℃) shows the spontaneous polarization to the [011] direction and takes a longer structure along the direction. The tetragonal crystal (5℃–120℃) shows the spontaneous polarization to the [001] direction and takes a longer structure along the direction by the ratio of c/a=1.01. The cubic crystal (higher temperature than Curie point 120℃) takes the calcium titanate structure (Perovskite structure) and Ba atoms position at the eight corners of the cube, six O atoms at the center of the planes, and a Ti atom at the center of the body.

참고 문헌

[1] Burcu Ertu, The Overview of The Electrical Properties of Barium Titanate, American Journal of Engineering Research, 2013, vol. 02, 01-07
[2] G. Arlt, D. Hennings and G. de With, Dielectric properties of fine‐grained barium titanate ceramics, Journal of Applied Physics, 1985, vol. 58, 1619
[3] Tomoaki Karaki, Kang Yan and Masatoshi Adachi, Barium Titanate Piezoelectric Ceramics Manufactured by Two-Step Sintering, Japanese Journal of Applied Physics, 2007, vol. 46, 7035-7038

바륨 티타네이트(IV) 준비 용품 및 원자재

원자재

준비 용품

바륨 티타네이트(IV) 공급 업체

공급자	전화	이메일	국가	제품 수	이점
Ningbo Luofei Nanotechnology Co. , Ltd.	400-8809926 18958272021	2943541784@qq.com	China	140	58
Shanghai bike new material technology co., LTD	021-34790086 17317635738	17317635738@163.com	China	496	58
BROFOS NANOTECHNOLOGY(NINGBO)CO ,LTD.	0574-62615397 17757424292	brofosnano@foxmail.com	China	206	58
Shanghai Xiao Huang Nanotechnology Co. , Ltd.	021-34781353 17702143778	3417983274@qq.com	China	134	58
Sigma-Aldrich	021-61415566 800-8193336	orderCN@merckgroup.com	China	51389	80
Shanghai Buwei Applied Materials Technology Co. LTD	021-64112762 18930491979	1460837389@qq.com	China	468	58
Yumu (Ningbo) New Materials Co., Ltd.	13116661121	yumuningbo@foxmail.com	China	146	58
Jiangsu AZ International Trading Co.,Ltd	17352330705 17352353340	3837170408@qq.com	China	76	58
Shanghai Liantian Material Technology Co., Ltd.	13370066691; 13370066691	3692356620@qq.com	China	204	58
J & K SCIENTIFIC LTD.	18210857532 18210857532	jkinfo@jkchemical.com	China	96815	76

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