A systematic review of different types of traditional averages for diffraction elastic constants in textured materials is given. In addition a new type of average, which recently was suggested, is presented. These averages are of vital importance for a correct interpretation of internal (e.g. residual) stress measurements.The theoretically predicted diffraction elastic constants are compared with the experimental ones for rolled steel samples; there exists good agreement between theory and experiment.On prksente une revue systematique des moyennes traditionelles utilisees pour le calcul des constants klastiques de diffraction dans le cas des materiaux avec la texture cristalline. On presente aussi une nouvelle moyenne, recemment proposee. Ces moyennes sont tres importantes pour une interpretation correcte des mesures de contraintes internes (p.ex. contraintes rksiduelles).Les constants klastiques de diffraction calcules sont comparks avec ceux mesurkes pour I'acier lamink: l'accord est trks bon.

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A complete set of f.c.c. rolling texture predictions, obtained with the use of a relaxed constraint model, is presented in this paper. The whole spectrum of textures between the copper and brass types can be found if some components of reaction stresses (between grains and the matrix) are relaxed. The best prediction of the copper type texture is found if c13 is a free parameter and the other components of grain deformation tensor are controlled by reaction stresses. The best prediction of the brass type texture is obtained if e l Z , e l 3 , and c Z 3 are free parameters. However, a decisive factor for the texture transition from the copper to the brass type is the relaxation of the e l 2 component.We present for all the considered cases the orientation distribution functions (O.D.F.) and also the pole figures for some selected cases.Nous presentons un ensemble des previsions des textures c.f.c. de laminage obtenues par le modile avec une relaxation partielle des contraintes de reaction. Une gamme de textures contenues entre celles type cuivre et type laiton peut &tre trouvee si certaines composantes des contraintes de reaction (qui agissent entre les grains et la matrice) sont relaxees. La meilleure prevision de la texture type cuivre est obtenue si c13 est laisse libre et les autres composantes du tenseur de deformation d'un grain sont controllees (par les contraintes de reaction). Dautre part le rneilleur rtsultat pour la texture type laiton est trouve si les composantes el,, c 1 3 et cZ3 sont libres. Neanmoins, un facteur decisif pour la transition de la texture entre celle type cuivre et type laiton est une relaxation de la composante c ,~.Nous presentons pour tous les cas les fonctions de distribution d'orientations cristallines ainsi que dans certains cas -les figures de pales.

RegistryNo. K2Ru03(OH)2, 1121 13-56-1. Table SI, listing the anisotropic thermal parameters, and Figures SI and SII, showing the coordination of the ruthenium and a projection of the structure on the ab plane, respectively (3 pages); Table SII, listing the observed and calculated structure factors (12 pages). Ordering information is given on any current masthead page. Supplementary Material Available:The compound tetramethylammonium trichlorocuprate(II), C4Hl2NCuCI3, exhibits two crystalline phase transitions, one at 3 19 K and the other at 373 K. X-ray structure determinations of the three corresponding phases were carried out at 213.2 (3), 323 (2), and 405 (2) K. These structures are deformed members of the hexagonal perovskite family (2L): crystal data at 213 K, monoclinic P2,, a = 8.948 ( 8 ) A, 6 = 32.225 (10) A, c = 8.980 (2) A, fl = 119.487 (18)'; crystal data at 323 K, triclinic Pi, a = 9.082 (5) A, 6 = 9.073 (5) A, c = 6.442 (3) A, or = 90.05 (4)O, fl = 92.40 (4)O, y = 119.99 (3)O; cryscal data at 405 K, hexagonal P6,/mmc, a = 6 = 9.160 (2) A, c = 6.474 (2) A. In the high-temperature phase (2L) the Jahn-Teller elongation is disordered over three possible configurations, x, y , and z , in the intermediate-temperature phase (2L) one site is ordered (2) and the other is disordered over two configurations (x and y ) , and the low-temperature phase (IOL) exhibits a static structure as far as the Jahn-Teller effect is concerned. All phases show disorder of the tetramethylammonium group except for the low-temperature phase, which is partially ordered with respect to this ion. This means that there must be another phase at lower temperature. The two compounds (Cu(TMSO),)[Cu2X6] (X = Br (1) and CI (2); TMSO = tetramethylene sulfoxide) have been synthesized and their crystal structures determined at room temperature. They are isostructural, and both crystallize in the triclinic system, space group Pi, with cell parameters for 1 of a = 8.448 (2) A, b = 9.630 (2) A, c = 11.655 (2) A, a = 65.42 ( 1 ) O , j3 = 71.59 ( 2 ) O , and y = 73.52 ( 1 ) O . The cell parameters of 2 are a = 8.250 (4) A, j3 = 9.330 (5) A, c = 11.131 (6) A, 01 = 67.59 ( 4 ) O ,

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