Aristotype

From Online Dictionary of Crystallography

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(Tidied translations and added German and Spanish (U. Mueller))
 
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<Font color="blue">Aristotype</Font> (''Fr'').  
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<font color="blue">Aristotype</font> (''Fr''). <font color="red">Aristotyp</font> (''Ge''). <font color="black">Aristotipo</font> (''It''). <font color="purple">アリストタイプ</font> (''Ja''). <font color="green">Aristotipo</font> (''Sp'').
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== Definition ==
== Definition ==
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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.
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An aristotype 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, where it is still mostly used. The cubic perovskite structure (which is adopted at most by half a dozen compounds) is regarded as the aristotype for the vast array of other lower-symmetry perovskites. The lower-symmetry structure is called '''hettotype'''.
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After Buerger, aristotypes are also known as '''basic structures''' and hettotypes as '''derivative structures'''.  
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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== References ==
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*Buerger, M. J. (1947). ''J. Chem. Phys.'' '''15''', 1-16. ''Derivative Crystal Structures''.
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*Megaw, H. (1973). ''Crystal Structures'', London: W. B. Saunders,  pp. 216, 282.
[[Category:Fundamental crystallography]]
[[Category:Fundamental crystallography]]

Latest revision as of 18:02, 8 November 2017

Aristotype (Fr). Aristotyp (Ge). Aristotipo (It). アリストタイプ (Ja). Aristotipo (Sp).

Definition

An aristotype 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, where it is still mostly used. The cubic perovskite structure (which is adopted at most by half a dozen compounds) is regarded as the aristotype for the vast array of other lower-symmetry perovskites. The lower-symmetry structure is called hettotype.

After Buerger, aristotypes are also known as basic structures and hettotypes as derivative structures.

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.

References

  • Buerger, M. J. (1947). J. Chem. Phys. 15, 1-16. Derivative Crystal Structures.
  • Megaw, H. (1973). Crystal Structures, London: W. B. Saunders, pp. 216, 282.