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Barium titanate - China Industrial Exhaust Fans - China Commercial Exhaust Fans by xiaod sfb
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Barium titanate - China Industrial Exhaust Fans - China Commercial Exhaust Fans by XIAOD SFB
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| Article Posted: 04/11/2011 |
| Article Views: 145 |
| Articles Written: 1384 - MORE ARTICLES FROM THIS AUTHOR |
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Barium titanate - China Industrial Exhaust Fans - China Commercial Exhaust Fans |
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Properties Structure of BaTiO3. The red spheres are oxygens, blue are Ti4+ cations, and the green ones are Ba2+. Barium titanate has the appearance of a white powder or transparent crystals. It is insoluble in water and soluble in concentrated sulfuric acid. Manufacture Barium titanate can be manufactured by liquid phase sintering of barium carbonate and titanium dioxide, optionally with other materials for doping. High purity barium titanate powder is reported to be a key component of new barium titanate capacitor energy storage systems for use in electric vehicles. Barium titanate is often mixed with strontium titanate. Uses Barium titanate is used as a dielectric material for ceramic capacitors, and as a piezoelectric material for microphones and other transducers. The spontaneous polarization of barium titanate is about 0.15 C/m2 at room temperature and its Curie point is 120 C. As a piezoelectric material, it was largely replaced by lead zirconate titanate, also known as PZT. Polycrystalline barium titanate displays positive temperature coefficient, making it a useful material for thermistors and self-regulating electric heating systems. Fully-dense nanocrystalline barium titanate has 40% higher permittivity than the same material prepared in classic ways. Barium titanate crystals find use in nonlinear optics. The material has high beam-coupling gain, and can be operated at visible and near-infrared wavelengths. It has the highest reflectivity of the materials used for self-pumped phase conjugation (SPPC) applications. It can be used for continuous-wave four-wave mixing with milliwatt-range optical power. For photorefractive applications, barium titanate can be doped by various other elements, e.g. iron. The addition of inclusions of barium titanate to tin has been shown to create a bulk material with a higher viscoelastic stiffness than that of diamonds. Barium titanate goes through two phase transitions that change the crystal shape and volume. This leads to composites where the barium titanates have a negative bulk modulus (Young's modulus), meaning that when a force acts on the inclusions, there is displacement in the opposite direction, further stiffening the composite. Thin films of barium titanate display electrooptic modulation to frequencies over 40 GHz. The pyroelectric and ferroelectric properties of barium titanate are used in some types of uncooled sensors for thermal cameras. See also Strontium titanate Lead zirconate titanate References ^ "Nanoparticle Compatibility: New Nanocomposite Processing Technique Creates More Powerful Capacitors". http://gtresearchnews.gatech.edu/newsrelease/barium-titanate.htm. Retrieved 2009-06-06. ^ Wadhawan, Vinod K. (2000). Introduction to ferroic materials. CRC Press. p. 10. ISBN 9789056992866. ^ Nyutu, Edward K.; Chen, Chun-Hu; Dutta, Prabir K.; Suib, Steven L. (2008). "Effect of Microwave Frequency on Hydrothermal Synthesis of Nanocrystalline Tetragonal Barium Titanate". The Journal of Physical Chemistry C 112: 9659. doi:10.1021/jp7112818. ^ "Fe:LiNbO3 Crystal". http://www.redoptronics.com/Fe-LiNbO3-crystal.html. Retrieved 2009-06-06. ^ Jaglinski, T; Kochmann, D; Stone, D; Lakes, Rs (2007). "Composite materials with viscoelastic stiffness greater than diamond". Science 315 (5812): 6202. doi:10.1126/science.1135837. PMID 17272714. ^ Tang, Pingsheng; Towner, D; Hamano, T; Meier, A; Wessels, B (2004). "Electrooptic modulation up to 40 GHz in a barium titanate thin film waveguide modulator". Optics Express 12 (24): 5962. doi:10.1364/OPEX.12.005962. PMID 19488237. External links Nanoparticle Compatibility: New Nanocomposite Processing Technique Creates More Powerful Capacitors EEStor's "instant-charge" capacitor batteries v d e Barium compounds BaBr2 BaCO3 BaC2O4 Ba(ClO3)2 BaCl2 BaCrO4 BaF2 BaFeO4 BaFe2O4 BaI2 Ba(NO3)2 BaO BaO2 Ba(OH)2 BaS BaSO4 BaTiO3 Categories: Titanates Barium compounds Ceramic materials Piezoelectric materials Ferroelectric materials Infrared sensor materials Nonlinear optical materials The e-commerce company in China offers quality products such as China Industrial Exhaust Fans , China Commercial Exhaust Fans, and more. For more , please visit Industrial Air Coolers today!
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