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钛酸钙

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钛酸钙
识别
CAS号 12049-50-2  ✓
PubChem 16212381
ChemSpider 17340234
SMILES
InChI
InChIKey AOWKSNWVBZGMTJ-SLQOSCGQAQ
RTECS XR2568666
性质
化学式 CaTiO3
摩尔质量 135.943 g·mol⁻¹
外观 白色粉末
密度 3.98 g/cm3
熔点 1975 °C
沸点 3000 °C
溶解性 不溶
危险性
致死量或浓度:
LD50中位剂量
>1200 mg/kg (oral, rat)
若非注明,所有数据均出自一般条件(25 ℃,100 kPa)下。

钛酸钙,又称三氧化钛钙,是化学式为CaTiO3无机化合物。作为矿物它被称为钙钛矿(perovskite),其以之后的俄国化学家L. A. Perovski(1792-1856)命名。其为无色的抗磁性固体,而矿物由于掺有杂质而通常呈彩色。

合成

CaTiO3可以由氧化钙二氧化钛在超过1300℃下进行合成。使用溶胶-凝胶法可以制成更纯净的产物,同时还能降低反应所需温度。由于是溶胶-凝胶过程中的粉状体,该化合物可以进一步压缩,并达到它的计算密度(约4.04 g/ml)[1][2]

结构

人们可得到钛酸钙的斜方晶体,其中特别是钙钛矿型结构[3]。在该基元中,钛(IV)占据八面体的中心,Ca2+位于12个氧原子笼的中心。许多有用的材质也用了相关结构(如钛酸钡)或其变形(如钇钡铜氧化物)。

应用

除了和其他几个物质作为钛的矿石外,钛酸钙的价值相对不大。将其还原可得到钛金属或钛铁合金[4]

参考文献

  1. ^ Gerhard Pfaff "Synthesis of calcium titanate powders by the sol-gel process" Chemistry of Materials 1994, vol. 6, 58-62. doi:10.1021/cm00037a013
  2. ^ Bruce Dunn and Jeffrey I. Zink "Sol–Gel Chemistry and Materials" Accounts of Chemical Research 2007 40 (9), 729-729. Template:DOI10.1021/ar700178b
  3. ^ R. H. Buttner, E. N Maslen: Electron difference density and structural parameters in CaTiO3. In: Acta Crystallographica. Nr. B48, 1992, S. 644-649.
  4. ^ Heinz Sibum, Volker Günther, Oskar Roidl, Fathi Habashi, Hans Uwe Wolf, "Titanium, Titanium Alloys, and Titanium Compounds" in Ullmann's Encyclopedia of Industrial Chemistry �2005, Wiley-VCH, Weinheim. doi:10.1002/14356007.a27 095

外部链接

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钛酸钙
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