碲块

性状描述: 灰白色有光泽易碎结晶性固体或黑 灰色至棕色无定形粉末。有金属特性。熔融的碲能溶解许多金属。在空气中燃烧发生蓝绿色火焰，生成二氧化碲。能与硝酸、卤素反应，能与浓硫酸或发烟硫酸反应生成红色溶液，不与盐酸、硫和硒反应。在空气存在下溶于氢氧化钾溶液呈深红色溶液。不溶于水、苯和二硫化碳。相对密度6.11～6.27。熔点449.8℃。沸点989.9℃。最小致死量(狗，皮下)290mg/kg。

质量标准: 99.99% metals basis，0.5-2mm:


外观Appearance                          Grey/Silver Granules
X-射线衍射X-Ray Diffraction             Conforms to Structure
纯度Purity                              ≥99.99% Based on Trace Metals Impurities
尺寸Size:                               0.5-2mm
ICP:                                    Confirms Tellurium Component Confirmed
痕量金属杂质total metallic impurities   ≤200ppm by ICP Atomic emission


Granules,99.999% metals basis:


外观Appearance                          Silver to Grey Granules
X-射线衍射X-Ray Diffraction             Conforms to Structure
纯度Purity                              ≥99.999% Based on Trace Metals Impurities
ICP:                                    Confirms Tellurium Component Confirmed  
痕量金属杂质total metallic impurities   ≤20ppm by ICP Atomic emission


powder,99.997% metals basis:


外观Appearance                          Grey to Dark Grey Powder or Granular Powder
X-射线衍射X-Ray Diffraction             Conforms to Structure
纯度Purity                              ≥99.997% Based on Trace Metals Impurities
ICP:                                    Confirms Tellurium Component Confirmed
痕量金属杂质total metallic impurities   ≤30ppm by ICP Atomic emission

储存条件: 密封保存

用途: 碲化合物的制备。橡 胶硬化和催化剂。高速切削钢、铸铁等的添加剂。制造消毒、杀虫和杀菌剂。制备放射性碘同位素。瓷器色料。电镀液中的光亮剂。玻璃着色材料以及添加到铅中增加它的强度和耐蚀性。