Aristotype

From Online Dictionary of Crystallography

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Originally, an aristotype is a printing-out process using paper coated with silver chloride in gelatin; now, any such process using silver salts in either collodion or gelatin; also, a print so made.
Originally, an aristotype is a printing-out process using paper coated with silver chloride in gelatin; now, any such process using silver salts in either collodion or gelatin; also, a print so made.
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== R eferences ==
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Megaw H. (1973). ''Crystal Structures'', London: W.B. Saunders,  p. 216, 282
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[[Category:Fundamental crystallography]]
[[Category:Fundamental crystallography]]

Revision as of 05:50, 30 January 2007

Aristotype (Fr).


Definition

An arisotype is a high-symmetry structure type that can be viewed as an idealized version of a lower symmetry structure. It was introduced by Helen Megaw in relation to perovskites which it is where it is still mostly used, the cubic perovskite structure (which is adopted at most half a dozen compounds) is regarded as the aristotype for the vast array of other lower-symmetry perovskites.

Originally, an aristotype is a printing-out process using paper coated with silver chloride in gelatin; now, any such process using silver salts in either collodion or gelatin; also, a print so made.

R eferences

Megaw H. (1973). Crystal Structures, London: W.B. Saunders, p. 216, 282