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    Crystal Texture      


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Texture measurement is done in most cases by measuring pole figures. A pole figure Phkl describes the volume fraction dV / V of the crystallites whose crystallographic directions <hkl> have a certain orientation in space.

     dV / V = Phkl (a, b) sin a da db

A pole figure is given graphically as a frequency distribution on the reference sphere or is stereographically projected into the "equator" plane in sample space.

Schematics of a polefigure and its stereographic projection

Schematics of a pole figure and its stereographic projection

The TEM as an automated texture goniometer

1983

Acquisition of pole figures by post-specimen beam deflection, but manual correction for the ellipticity of diffraction rings.
F.J. Humphreys: Textures and Microstructures 6(1983) 45-62

1983

Analytical and experimental on-line intensity correction for SAD pole figures in pre- and post-specimen beam deflection mode.
R. Schwarzer: Beitr. Elektronenmikr. Direktabb. Oberfl. (BEDO) 16(1983) 131-134

1984

Automated SAD pole-figure measurement with pre- and post-specimen beam deflection. On-line correction for background, absorption, diffracting volume and ring ellipticity by the software.
H. Weiland and R. Schwarzer: Proc. ICOTOM 7 (1984) 857-862
R. Schwarzer: BEDO 18(1985) 61-68
R.A. Schwarzer and H. Weiland: in H.J. Bunge (ed.): Experimental techniques of texture analysis. DGM Informations-Ges. Oberursel, 1986, 287-300

1998

RHEED pole-figure measurement on bulk surfaces in the TEM. A digital CCD camera is used as an area detector.
B. Schńfer and R.A. Schwarzer: Materials Science Forum 273-275(1998) 223-228

 

Features:
          + Measured area:  SAD
          1 Ám .... 500 Ám
                                            R HEED    ~ 0.1 - 2 mm
          + High speed: ~ 5 min for the acquisition of several pole figures
          + Extremely high sensitivity.

    The principles of SAD pole-figure measurement

    The principles of SAD pole-figure measurement.

 


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