Preferred orientation

From Online Dictionary of Crystallography

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<font color="blue">Orientation préférentielle</font> (''Fr''). <font color="red">Bevorzugte Orientierung</font> (''Ge''). <font color="brown">преимущественная ориентация</font> (''Ru''). <font color="black">Orientazione preferenziale</font>(''It''). <font color="purple">優先方位</font>(''Ja''). <font color="green">Orientación preferente</font> (''Sp'').
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<font color="blue">Orientation préférentielle</font> (''Fr''). <font color="red">Bevorzugte Orientierung</font> (''Ge''). <font color="black">Orientazione preferenziale</font>(''It''). <font color="purple">優先方位</font>(''Ja''). <font color="brown">преимущественная ориентация</font> (''Ru''). <font color="green">Orientación preferente</font> (''Sp'').

Latest revision as of 10:04, 15 December 2017

Orientation préférentielle (Fr). Bevorzugte Orientierung (Ge). Orientazione preferenziale(It). 優先方位(Ja). преимущественная ориентация (Ru). Orientación preferente (Sp).


Definition

Preferred orientation arises when there is a stronger tendency for the crystallites in a powder or a texture to be oriented more one way, or one set of ways, than all others. An easily visualized case of preferred orientation is that which results when a material with a strong cleavage or growth habit is packed into a specimen or when a metal sheet is obtained by rolling.

Preferred orientation should not be confused with 'graininess' or 'inadequate powder average', in which there are so few crystallites being irradiated that the number of correctly oriented crystallites varies significantly from reflection to reflection of different types.

See also

  • Chapter 2.3 of International Tables for Crystallography, Volume C for X-ray techniques
  • Chapter 2.4 of International Tables for Crystallography, Volume C for electron techniques