氧化铬 | 11118-57-3

• 分子结构分类: 无机化合物 - 混合金属/非金属化合物 - 各种混合金属/非金属
• 中文名称: 氧化铬
• 中文别名: 氧化铬,铬氧化物；氯二氟乙酰氟
• 英文名称: Chromic oxide
• 英文别名: chromium(3+);oxygen(2-)
• CAS: 11118-57-3
• 化学式: Cr2O3
• 分子量: 151.99
• InChiKey: UOUJSJZBMCDAEU-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  -0.36
• 重原子数：
  5
• 可旋转键数：
  0
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.0
• 拓扑面积：
  3
• 氢给体数：
  0
• 氢受体数：
  3

反应信息

• 作为反应物：
  描述：

  氧化铬 、 硫酸 、 在 Cr 作用下， 以formed on the surface of the block during the sintering/fusing step (step S4)的产率得到硫酸铬
  参考文献：
  名称：

  Chromium oxide powder having a reduced level of hexavalent chromium and a method of making the powder

  摘要：

  一种具有较低六价铬水平的精制氧化铬粉末。该精制粉末可以通过酸洗和还原洗涤或通过热处理来减少六价铬至生物相容水平。然后将粉末包装以限制氧化和吸湿。

  公开号：

  US20090162273A1
• 作为试剂：
  描述：

  邻甲酚 、 甲醇 、 氧化锗 、 Barium(2+);oxygen(2-) 在 Ferrous oxide [hsdb] 、 氧化铬 作用下， 以 水 为溶剂， 以2,6-xylenol was obtained with a selectivity of 99.2%的产率得到2,6-二甲基苯酚
  参考文献：
  名称：

  Catalysts for the o-substitution of phenols

  摘要：

  本发明涉及一种在气相中使用铁、铬、硅和至少一种碱土金属、镧和锰的氧化物催化剂或铁、铬、来自包括锗、钛、锆、锡、铅的金属组的一种金属和至少一种碱金属、碱土金属、镧和锰氧化物催化剂，将苯酚、至少具有一个自由o-位的单烷基苯酚和二烷基苯酚与甲醇和/或二甲醚反应，形成o-取代苯酚的过程。

  公开号：

  US04406824A1

文献信息

• Zinc oxide ceramics and method for producing the same and zinc oxide
  申请人：Matsushita Electric Industrial Co., Ltd.

  公开号：US05739742A1

  公开（公告）日：1998-04-14

  A zinc oxide ceramic and a method for producing the zinc oxide ceramics are provided wherein a zinc oxide varistor for a high voltage which has excellent electric characteristics and great reliability for DC loading and surge can be produced in high yield by performing sintering at a temperature of 750.degree. to 1050.degree. C. At least one of B.sub.2 O.sub.3, Cr.sub.2 O.sub.3, GeO.sub.2, LaO.sub.3, MgO, Nb.sub.2 O.sub.5, Nd.sub.2 O.sub.3, PbO, PrO, Sb.sub.2 O.sub.3, SiO.sub.2, SnO.sub.2, Ta.sub.2 O.sub.5, WO.sub.3 and Y.sub.2 O.sub.3 powders and a Bi.sub.2 O.sub.3 powder are mixed. A mixture thus obtained is heat treated at a temperature of 400.degree. to 700.degree. C. and ground to prepare a synthetic powder. 0.5 to 20 parts by weight of the synthetic powder and 0.1 to 5.0 parts by weight of at least one of CoO, MnO.sub.2 and NiO powders are added and ground for 100 parts by weight of a zinc oxide powder. A binder is added to the ground powder to form a sheet. A silver paste is applied to the surface of the sheet to laminate four sheets. A lamination is integrally sintered at a temperature of 840.degree. C. A zinc oxide varistor of a lamination type comprises an internal silver electrode, an internal silver counter electrode, an effective layer, a noneffective layer, and an external silver electrode.

  提供了一种氧化锌陶瓷和制备氧化锌陶瓷的方法，其中可以在750°C至1050°C的温度下烧结，生产出具有优异电学特性和直流负载和浪涌方面极高可靠性的高压氧化锌压敏电阻器，并且可以高产率生产。混合至少一种B.sub.2 O.sub.3、Cr.sub.2 O.sub.3、GeO.sub.2、LaO.sub.3、MgO、Nb.sub.2 O.sub.5、Nd.sub.2 O.sub.3、PbO、PrO、Sb.sub.2 O.sub.3、SiO.sub.2、SnO.sub.2、Ta.sub.2 O.sub.5、WO.sub.3和Y.sub.2 O.sub.3粉末和Bi.sub.2 O.sub.3粉末，然后将所得混合物在400°C至700°C的温度下热处理并研磨以准备合成粉末。对于100份氧化锌粉末，添加0.5至20份合成粉末和0.1至5.0份CoO、MnO.sub.2和NiO粉末中的至少一种，然后研磨。向研磨后的粉末中添加粘合剂以形成薄片。将银浆涂在薄片表面上以层压四张薄片。在840°C的温度下整体烧结层压体。层压型氧化锌压敏电阻器包括内部银电极、内部银对电极、有效层、无效层和外部银电极。
• Multi-layered ceramic porous body
  申请人：Toshiba Ceramics Co., Ltd.

  公开号：US05834108A1

  公开（公告）日：1998-11-10

  A ceramic porous body has a layered structure including a plurality of foam-like ceramic layers. The foam-like ceramic layers are formed by firing foam-like ceramic shaped layers each having a thickness of not more than 5 mm. The adjacent shaped layers are joined directly, or bonded via a thin foam-like ceramic layer or dense ceramic layer.

  一种陶瓷多孔体具有分层结构，包括多个泡沫状陶瓷层。泡沫状陶瓷层是通过烧结泡沫状陶瓷形状层形成的，每层厚度不超过5毫米。相邻的形状层直接连接，或通过薄泡沫状陶瓷层或致密陶瓷层粘接。
• METHOD FOR PRODUCING CHROMIUM (III) OXIDE
  申请人：Friedrich Holger

  公开号：US20130108543A1

  公开（公告）日：2013-05-02

  Process for preparing chromium(III) oxide, comprising the steps of: a) Decomposing an alkali metal ammonium chromate double salt at a temperature of 200 to 650° C., especially of 250 to 550° C., b) washing the decomposition product obtained after a) and c) calcining the product obtained after b) at a temperature of 700 to 1400° C., especially of 800 to 1300° C.

  制备三价铬氧化物的过程，包括以下步骤： a) 在200至650°C的温度下分解一种碱金属铵铬酸盐双盐，特别是在250至550°C的温度下进行； b) 洗涤步骤a)得到的分解产物； c) 在700至1400°C的温度下煅烧步骤b)得到的产物，特别是在800至1300°C的温度下进行。
• METHOD FOR PRODUCING AMMONIUM DICHROMATE
  申请人：Friedrich Holger

  公开号：US20130129604A1

  公开（公告）日：2013-05-23

  Process for preparing ammonium dichromate, comprising the steps of c) thermally decomposing an alkali metal ammonium chromate double salt, especially a sodium ammonium chromate double salt or hydrates thereof, at a temperature up to 200° C., especially of 75 to 190° C., to form ammonium dichromate and d) removing the ammonium dichromate from the decomposition product obtained after step c), by crystallization, characterized in that the alkali metal ammonium chromate double salt corresponds to the formula M x (NH 4 ) y CrO 4 or hydrates thereof, in which M is Na or K, particular preference being given to Na, x is from 0.1 to 0.9, preferably from 0.4 to 0.7, y is from 1.1 to 1.9, preferably from 1.3 to 1.6, and the sum of x and y is 2.

  制备重铬酸铵的过程，包括以下步骤： c) 在温度高达200℃，尤其是在75至190℃之间，热分解碱金属铵铬酸盐双盐，特别是钠铵铬酸盐双盐或其水合物，以形成重铬酸铵； d) 通过结晶从步骤c）得到的分解产物中去除重铬酸铵。 其特征在于，碱金属铵铬酸盐双盐对应于以下公式： Mx（NH4）yCrO4或其水合物， 其中M为Na或K，特别是Na，x为0.1至0.9，优选为0.4至0.7，y为1.1至1.9，优选为1.3至1.6，x和y的和为2。
• Chromium oxide powder having a reduced level of hexavalent chromium and a method of making the powder
  申请人：Lawrynowicz Daniel E.

  公开号：US20090162273A1

  公开（公告）日：2009-06-25

  A refined chromium oxide powder having a reduced level of hexavalent chromium. The refined powder may be produced by acid and reduction washing or by heat treatment to reduce the hexavalent chromium to a biocompatible level. The powder is then packaged to limit oxidation and absorption of moisture.

  一种具有较低六价铬水平的精制氧化铬粉末。该精制粉末可以通过酸洗和还原洗涤或通过热处理来减少六价铬至生物相容水平。然后将粉末包装以限制氧化和吸湿。