Imperator Crassus. Julius Caesar arrives at the House of Crassus and after a brief tussle with Crassus' guards, is welcomed by the man himself. Crassus strikes an alliance with Caesar in order to bring an end to Spartacus' rebellion. He orders Caesar to remain unshaven and the purpose of this is not revealed.
1 Lanthanum oxide additive to tungsten is used in gas tungsten arc welding electrodes, as a substitute for radioactive thorium. 2  Various compounds of lanthanum and other rare-earth elements (oxides, chlorides, etc.) are components of various catalysis, such as petroleum cracking catalysts.
Swedish chemist Carl Gustav Mosander discovered lanthanum during experiments on an impure sample of cerium nitrate in 1839. Like most of the rare-earth elements, lanthanum is used in small amounts to alter key properties of other materials.Lanthanum oxide is added to glass to impart increased resistance to alkalis, strength, a high refractive index and low dispersion, and can be used to make infrared-absorbing glass.wedish chemist Carl Gustav Mosander discovered lanthanum during experiments on an impure sample of cerium nitrate in 1839. Like most of the rare-earth elements, lanthanum is used in small amounts to alter key properties of other materials.