Crystallography and Crystal Chemistry Crystals are essential to modern society,their study using X-rays (radio-crystallography)gave birth to crystal chemistry,at the beginning of 20th century. 运打 llG-bem Crystal chemistry's objective is to explain the relationship between the properties,the chemical composition and the arrangement of atoms in crystals. The crystallographic approach Applications for crystallography today exist not only The crystallographic approach to understanding in materials science,but also in the synthesis and atomic arrangement represented a revolution for structure determination of new molecular materials Strxture-Property Beltions science.For the first time,we could directly see the incuding the development of new medicines. atomic structure and make-up of materials.This enabled scientists to focus on developing strategies for making materials with new and/or improved physical properties e.g.new generation batteries. new materials for hydrogen storage..etc. in principle if a compound or substance can be crystallised its structure can be determined by X-ray crystallography. G-jouaks IYCr2014