Preferred orientation

random single crystal oriented polycrystalline material Preferred orientation Stereographic projections of pole density

RD {100} poles {110} poles Preferred orientation Simple example - Goss texture (cubic)

RD {100} & {110} poles In conventional powder diffractometry, reflections only appear when plane poles (reciprocal lattice vectors) are coincident w/ diffraction vector (always perpendicular to specimen surface) Preferred orientation Simple example - Goss texture (cubic)

{100} poles One meas. scheme - do scans at various angles Preferred orientation To obtain pole figures, need additional rotation axes - sample intensity for one set of planes over hemisphere Run random specimen & plot intensity difference to get pole figure Use std symmetry projections to determine texture type(s)

Preferred orientation

Preferred orientation

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Modelling of preferred orientation

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Effect of Preferred Orientation on Powder Diffraction Data

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