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Crystalline Solids Lab Report

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OBJECTIVES
The aim of this experiment is to give better understanding on a crystal structure of crystalline solids. This lab was designed to assists students to understand atomic arrangement in crystalline materials in 3 dimensional (3D) by utilization of relevant software. Crystal structure of several materials will be constructed based on their crystallographic information files. Thus at the end of this experiment, students are expected to:
• Able to understand concepts of crystal structure, crystal system, 14 Bravais lattices and atomic arrangements of crystalline solids.
• Able to understand atomic arrangement in crystalline solids by using virtual 3 dimensional, models by assistant of relevant softwares.
• Able to have a fundamental knowledge on crystallography that may be useful to describe structure materials.
INTRODUCTION
Most elements metal crystallize upon solidification into three densely packed crystal structure which is body-centered cubic (BCC), Face-centered cubic (FCC) and Hexagonal close-packed. Crystals actually are crystalline solids that contain the regular arrangement of atoms in long-range order. Chemical and physical properties of crystalline solids basically depend on how the crystal structures of the element, in particular the spatial arrangements of atoms, ions or molecules within the unit …show more content…

It is an ionic with the flourite structure . The lattice structure is FCC which is same as NaCl and Diamond. In the structure it contains Ca2+ and F- ions. The calcium ions are surrounded with eight neighbouring fluoride ions. Then, fluoride ions are surrounded by a tetrahedron of four calcium ions. The coordination in the structure can be described as (8:4) since each flouride ions are surrounded with four calcium ions. Flourite having a space group of F m -3m. The unit cell of flourite is described as a simple cubic lattice formed by F- ions where Ca2+ ion is contained in every second

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