EARLY FINDING OF PREFERRED ORIENTATION - A NEW METHOD

被引:245
作者
ALTOMARE, A
CASCARANO, G
GIACOVAZZO, C
GUAGLIARDI, A
机构
[1] Istituto di Ricerca per lo Sviluppo, di Metodologie Cristallografiche CNR, Bari
关键词
D O I
10.1107/S002188989400422X
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Pattern decomposition programs are able to derive, from the measured powder diffraction patterns, estimates of the square moduli of the structure factors. A method is described that, by statistical analysis of the normalized structure-factor moduli, is able to obtain information about the possible presence of preferred orientation. Cylindrical symmetry of the specimen is necessary. The method proves to be efficient and quite useful for the application of direct methods to powder data.
引用
收藏
页码:1045 / 1050
页数:6
相关论文
共 22 条
  • [1] SIR92 - a program for automatic solution of crystal structures by direct methods
    ALTOMARE, A
    CASCARANO, G
    GIACOVAZZO, G
    GUAGLIARDI, A
    BURLA, MC
    POLIDORI, G
    CAMALLI, M
    [J]. JOURNAL OF APPLIED CRYSTALLOGRAPHY, 1994, 27 : 435 - 435
  • [2] Baerlocher C., 1982, XRS 82 XRAY RIETVELD
  • [3] BAERLOCHER C, 1992, P IUCR COMMISSION PO
  • [4] Bunge H.J., 1989, CRYST REV, V2, P67, DOI [10.1080/08893118908032948, DOI 10.1080/08893118908032948]
  • [5] CAPCOVA P, 1974, CZECH J PHYS B, V24, P891
  • [6] DIRECT METHODS AND STRUCTURES SHOWING SUPERSTRUCTURE EFFECTS .3. A GENERAL MATHEMATICAL-MODEL
    CASCARANO, G
    GIACOVAZZO, C
    LUIC, M
    [J]. ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES, 1988, 44 : 176 - 183
  • [7] SIRPOW.91 - A DIRECT-METHODS PACKAGE OPTIMIZED FOR POWDER DATA
    CASCARANO, G
    FAVIA, L
    GIACOVAZZO, C
    [J]. JOURNAL OF APPLIED CRYSTALLOGRAPHY, 1992, 25 (pt 2) : 310 - 317
  • [8] DIRECT METHODS AND STRUCTURES SHOWING SUPERSTRUCTURE EFFECTS .4. A NEW APPROACH FOR PHASE SOLUTION
    CASCARANO, G
    GIACOVAZZO, C
    LUIC, M
    [J]. ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES, 1988, 44 : 183 - 188
  • [9] THE CRYSTAL-STRUCTURE OF PBS2O3
    CHRISTENSEN, AN
    HAZELL, RG
    HEWAT, AW
    OREILLY, KPJ
    [J]. ACTA CHEMICA SCANDINAVICA, 1991, 45 (05): : 469 - 473
  • [10] CORRECTION OF INTENSITIES FOR PREFERRED ORIENTATION IN POWDER DIFFRACTOMETRY - APPLICATION OF THE MARCH MODEL
    DOLLASE, WA
    [J]. JOURNAL OF APPLIED CRYSTALLOGRAPHY, 1986, 19 (pt 4) : 267 - 272