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Using models, shows the three important stages of crystal structure that occur in metallic substances: hcp, fcc and bcc. Discusses alloy structures and transitions between different structures in a hot...
Explains why phenocrysts (large mineral crystals) form in lava flows and why one molten lava forms phenocrysts of a different mineral from another. Examines the crystallisation and melting behaviour of...
[3: Discusses elementary theory of liquid crystal states and the use of liquid crystals in practical display devices. Includes models of nematic, smectic and cholesteric phases, discusses devices using...
Two video sequences showing a series of demonstrations of experimental techniques which include: continuous extractions; flash chromatography; reduced-pressure distillation; small-scale recrystallisation and...
The second of three working videos course S343. [See synopses of individual programmes for details of content.]
Liquid crystal can be thought of as a fourth state of matter, between liquid and solid. The programme describes the three phases of liquid crystal: smectic, nematic and cholesteric. Friedrich Reinitzer’s...
Covers melting point determination, crystallisation of organic compounds, distillation.
Band 1: How boules or ingots - single crystals of semiconducting materials - are produced by the silicon industry. Band 2: Shows the process stages for the BY249 diode, with explanations of some of the...
An introduction to crystals with a discussion of new research developments.*
Recorded in a laboratory in University College, London. Discusses the various techniques and procedures that are used to prepare pure organic compounds. Organic reactions and product recovery are seen from...
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