Available online
Description
This programme applies only to the 1973 presentation of the course. As a result of feedback, and meeting students at Summer School, the Course team was able to identify some areas of conceptual dif...ficulty. One which was considered to benefit most from revision using the tv medium was crystal structure, how atoms and molecules pack together. Professor Charles Newey and Dr Ian Boustead demonstrate the ideas of layers of atoms and molecules, modes of packing and how planes and directions may be specified in space, using Miller indices.
This programme applies only to the 1973 presentation of the course. As a result of feedback, and meeting students at Summer School, the Course team was able to identify some areas of conceptual dif...ficulty. One which was considered to benefit most from revision using the tv medium was crystal structure, how atoms and molecules pack together. Professor Charles Newey and Dr Ian Boustead demonstrate the ideas of layers of atoms and molecules, modes of packing and how planes and directions may be specified in space, using Miller indices.
| Module code and title: | TS251, An introduction to materials |
|---|---|
| Item code: | TS251; 17 |
| First transmission date: | 06-10-1973 |
| Published: | 1973 |
| Rights Statement: | |
| Restrictions on use: | |
| Duration: | 00:24:36 |
| + Show more... | |
| Producer: | Colin Robinson |
| Contributors: | I. Boustead; Charles Newey |
| Publisher: | BBC Open University |
| Keyword(s): | Atoms; Crystal structure; Layers; Miller indices; Modes of packing; Molecules; Planes |
| Footage description: | Charles Newey introduces the programme which will review crystal structure. Newey uses atomic models to demonstrate how a one dimensional crystal, a two dimensional crystal and a three dimensional crystal are formed. The atoms of the two dimensional plane and three dimensional crystal are close packed. Newey demonstrates one mode of stacking planes of atoms (A,B,A,B. .. mode). Newey builds a model of a structural cell which shows, in miniature, how atoms are arranged in the larger model with a close packed hexagonal structure. Newey demonstrates a second mode of stacking planes of atoms (A, B, C, A, B, C...) Newey shows the structural cell for this mode of stacking a face centred cubic structure. Ian Boustead with a ball and stick molecular model of methane. He explains that small molecules stack very much like atoms. Boustead with models of the hexane molecule. He demonstrates how a larger, rigid molecule like this is packed in a two dimensional plane. Boustead models the three dimensional stacking of hexane with cylindrical wooden blocks. He lists the limitations of this model. Boustead uses various models of a long polythylene molecule to explain and demonstrate how these molecules pack and stack in crystal structure. Charles Newey with a face centred cubic structure model. He uses this to help derive a simple description of a crystal structure. Ian Boustead applies the same principle to more complex molecular structure. He uses models of the hexane molecule to aid. Charles Newey explains how particular planes and directions are specified in crystals, by using Miller indices. Animated diagrams are used to aid his discussion. Newey sums up. |
| Master spool number: | 6HT/71209 |
| Production number: | 00525_5067 |
| Videofinder number: | 1569 |
| Available to public: | no |
