University:
Swansea University
Course:
EGA109 | Introductory Organic Chemistry
Academic year:

2023
Views:

382

Pages:

2
Author:

Sanjeev K

Prep. of sc N 99.9999% pure Si Cy GeDistillationSeperation of materials is based on differencein boiling Gell4 points. Cy for Si sity.ForAs is Gye removed from Gellp (bp-83.ioc)withhelp of HCl.Pure Ge Cl4 is obtaining by fractional distilltionin presence of Cl.After cooling, pure Gell4 istreated withextra pune water to get Ge oxide.Subsequent reduction of Gelly with pure Haffords highly pure elemental Ge.Gell + 21420 Ge eO2it 4HCGeO2 + 2thGe + 21120Similarly distilled trichloro silanze (58 HCG)is employed to get St of high punity.Zone Refining Difference between solubility of imp unitiesin the motten Cy solid phases is used toconcentrate impunities at the end sectionof ingob.This techniqueis based on the principle that whenan impure metal in a matten state is allowedto cool, only the metal crystallizes when theimpunities remain present in the matterstate(mass) or melt.Used for purification of Ge, Si, Ga etc.Czochralski enystalpulling techniqueGe or Si obtained by Zone retining is polycrystallineu no regularity in their crystal sizes structure bycontains crystals of differentThis method involves growing the crystal ona single crystal seed, thereby the stomsreproduce identical atomic arrangementsas that of the seed crystalIImetting ofintroseedbeginingcrystalcrystaloxidetrmeltof crystalpullingboule coolingmaterialgrowth