title: An X-ray diffractometer for accurate structural invariant phase determination.
abstract: Instrumental advances and experimental procedures for determining invariant triplet phases by three-beam X-ray diffraction are presented. A simple X-ray diffractometer is described. It allows the exploitation of the natural linear polarization of synchrotron radiation for eliminating systematic errors in triplet-phase determination. Examples of data-collection procedures with the diffractometer for composing a polarization-dependent set of azimuthal scans are given as well as the suggestion of an analytical procedure for extracting accurate triplet phases.
authors.affiliation: Instituto de Física, USP, CP 66318, 05315-970 São Paulo, Brazil. morelhao@if.usp.br
authors.forename: Sérgio L
authors.initials: SL
authors.lastname: Morelhão