X-ray powder diffraction analysis of K3Nb3WO9(AsO4)2

2006 ◽  
Vol 21 (3) ◽  
pp. 236-237
Author(s):  
S. Belkhiri ◽  
D. Mezaoui ◽  
H. Rebbah ◽  
S. Ouhenia ◽  
M. A. Belkhir
Keyword(s):  
Powder Diffraction ◽  
Diffraction Data ◽  
Powder Diffraction Data ◽  
X Ray ◽  
Figures Of Merit ◽  
Variation Of Parameters ◽  
Cell Dimensions ◽  
Orthorhombic Cell ◽  
Radiation Unit ◽  
Unit Cell Dimensions

K3Nb3WO9(AsO4)2 has been investigated by means of X-ray powder diffraction. Powder diffraction data were obtained by conventional diffractometer with Kα radiation. Unit-cell dimensions were determined by an indexing program based on variation of parameters by successive dichotomies. An orthorhombic cell (space group Pnma) was found with a=15.001 (1) Å, b=14.814(1) Å, c=7.2374 (8) Å, and V=1608.4 (4) A3. The figures of merit were calculated to be M(20)=35.9 and F(20)=70.8 (0.0055,51).

Powder Diffraction Data of Three 9-Amino-1,2,3,4- Tetrahydroacridine Alzheimer's Disease Therapeutics

1991 ◽  
Vol 6 (4) ◽  
pp. 196-199 ◽  
Author(s):  
G. Bandoli ◽  
M. Nicolini ◽  
A. Ongaro
Keyword(s):  
Powder Diffraction ◽  
Diffraction Data ◽  
Structure Determination ◽  
Powder Diffraction Data ◽  
Single Crystal Diffraction ◽  
X Ray ◽  
Figures Of Merit ◽  
Cell Dimensions ◽  
Tacrine Hydrochloride ◽  
Unit Cell Dimensions

AbstractTacrine hydrochloride monohydrate, velnacrine maleate and suronacrine maleate have been investigated by means of X-ray powder diffraction. The unit cell dimensions, determined by single-crystal diffraction data, agree well with those of powder diffraction analysis, which is characterized by good figures of merit for the three drugs. Present work assures that single-crystals are good representatives of the commercial powdered samples, since experimental and simulated (from structure determination) powder patterns are practically identical.

Powder diffraction data for two mixed nitrates CeMI2(NO3)6(MI=Rb,Cs)

1993 ◽  
Vol 8 (1) ◽  
pp. 57-59
Author(s):  
N. Guillou ◽  
J. P. Auffrédic ◽  
D. Louër
Keyword(s):  
Powder Diffraction ◽  
Diffraction Data ◽  
Figure Of Merit ◽  
Powder Diffraction Data ◽  
Rubidium Nitrate ◽  
X Ray ◽  
Precise Data ◽  
Variation Of Parameters ◽  
Cell Dimensions ◽  
Unit Cell Dimensions

Ceric caesium nitrate CeCs2(NO3)6 and ceric rubidium nitrate CeRb2(NO3)6 have been investigated by means of X-ray powder diffraction. Precise data collected with strictly monochromatic radiation (CuKα1) are reported. Monoclinic unit cell dimensions were found by the indexing program DICVOL91 based on the variation of parameters by successive dichotomy. The final refined parameters are: a = 13.5373(7) Å, b = 7.0787(5) Å, c = 8.1672(5) Å, β = 90.813(5)° for the caesium compound and a = 13.0567(5) Å, b = 6.8684(2) Å, c = 8.1786(3) Å, β = 91.436(4)° for the rubidium compound, and the indexings are characterized by the figure of merit F30 equivalent to 245 (0.0033,37) and 194 (0.0040,39), respectively.

Crystal data and X-ray powder diffraction data of 2,4-diiodo-4-nitrophenol (disophenol), C6H3I2NO3. More precise X-ray powder diffraction data of p-nitrophenol, C6H5NO3

1996 ◽  
Vol 11 (4) ◽  
pp. 301-304
Author(s):  
Héctor Novoa de Armas ◽  
Rolando González Hernández ◽  
José Antonio Henao Martínez ◽  
Ramón Poméz Hernández
Keyword(s):  
Powder Diffraction ◽  
Diffraction Data ◽  
Unit Cell ◽  
Crystal Data ◽  
Powder Diffraction Data ◽  
Space Group ◽  
X Ray ◽  
Cell Dimensions ◽  
Unit Cell Dimensions ◽  
Monoclinic Cell

p-nitrophenol, C6H5NO3, and disophenol, C6H3I2NO3, have been investigated by means of X-ray powder diffraction. The unit cell dimensions were determined from diffractometer methods, using monochromatic CuKα1 radiation, and evaluated by indexing programs. The monoclinic cell found for p-nitrophenol was a=6.159(2) Å, b=8.890(2) Å, c=11.770(2) Å, β=103.04(2)°, Z=4, space group P21 or P2l/m, Dx=1.469 Mg/m3. The monoclinic cell found for disophenol has the dimensions a=8.886(1) Å, b=14.088(2) Å, c=8.521(1) Å, β=91.11(1)°, Z=4, space group P2, P2, Pm or P2/m, Dx=2.438 Mg/m3.

Powder X-Ray Diffraction Data for Ca2Bi2O5and C4Bi6O13

1992 ◽  
Vol 7 (2) ◽  
pp. 109-111 ◽  
Author(s):  
C.J. Rawn ◽  
R.S. Roth ◽  
H.F. McMurdie
Keyword(s):  
Powder Diffraction ◽  
Diffraction Data ◽  
Neutron Powder Diffraction ◽  
X Ray Diffraction ◽  
Space Group ◽  
X Ray ◽  
Cell Dimensions ◽  
Powder Samples ◽  
Orthorhombic Cell ◽  
Unit Cell Dimensions

AbstractSingle crystals and powder samples of Ca2Bi5O5and Ca4Bi6O13have been synthesized and studied using single crystal X-ray diffraction as well as X-ray and neutron powder diffraction. Unit cell dimensions were calculated using a least squares analysis that refined to a δ2θof no more than 0.03°. A triclinic cell was found with space group , a = 10.1222(7), b = 10.1466(6), c = 10.4833(7) Å. α= 116.912(5), β= 107.135(6) and γ= 92.939(6)°, Z = 6 for the Ca2Bi2O5compound. An orthorhombic cell was found with space group C2mm, a = 17.3795(5), b = 5.9419(2) and c = 7.2306(2) Å, Z = 2 for the Ca4Bi6O13compound.

ZrSiO4 mit monokliner Baddeleyitstruktur?.

1976 ◽  
Vol 31 (9) ◽  
pp. 1175-1178 ◽  
Author(s):  
Kurt Walenta
Keyword(s):  
Powder Diffraction ◽  
Diffraction Data ◽  
Unit Cell ◽  
Powder Diffraction Data ◽  
X Ray ◽  
Cell Dimensions ◽  
Unit Cell Dimensions ◽  
Limits Of Error ◽  
Zircon Particles

A new compound having the same composition as zircon, ZrSiO4, but differing from it in its structure has been obtained by heating zircon particles to a temperature of 5000 to 10000°K. According to X-ray powder diffraction data the structure and within limits of error also the unit-cell dimensions are identical with that of monoclinic baddeleyite, ZrO2. This suggests that the baddeleyite lattice can not only accommodate 10 molecular % SiO2 as is already known for some time, but substantially more, unless it is assumed that some kind of submicroscopic exsolution of amorphous SiO2 has taken place.

Powder diffraction data and Rietveid refinement of the compound Ba2Cl2Cu3O4

1995 ◽  
Vol 10 (4) ◽  
pp. 282-287 ◽  
Author(s):  
W. Pitschke ◽  
G. Krabbes ◽  
N. Mattern
Keyword(s):  
Powder Diffraction ◽  
Diffraction Data ◽  
Unit Cell ◽  
Powder Diffraction Data ◽  
Space Group ◽  
X Ray ◽  
Cell Dimensions ◽  
Unit Cell Dimensions

Indexed X-ray powder diffraction data are reported for the semiconducting compound Ba2Cl2Cu3O4. The structure was refined by the Rietveid technique on the basis of the space group I4/mmm. Refined unit cell dimensions are a = 5.5156(1) Å, c = 13.8221(3) Å, V = 420.49 Å3Dx = 4.74 g/cm3, F30 = 129(0.0075,30), M20 = 121, Rp = 6.58, Rwp = 8.66, and RB = 4.49.

Powder Diffraction Data of Potassium Calcium Phosphate KCa PO4.H2O

1987 ◽  
Vol 2 (4) ◽  
pp. 253-254 ◽  
Author(s):  
D. Louër ◽  
F. Deneuve ◽  
N. Ouillon
Keyword(s):  
Calcium Phosphate ◽  
Powder Diffraction ◽  
Diffraction Data ◽  
Unit Cell ◽  
Powder Diffraction Data ◽  
X Ray ◽  
Cell Dimensions ◽  
Unit Cell Dimensions ◽  
Monoclinic Cell

AbstractPotassium calcium phosphate, KCa PO4.H2O, has been investigated by means of X-ray powder diffraction. Unit cell dimensions were determined from diffractometer data obtained with strictly monochromatized Cu Kα1 radiation, by indexing programs. A C-centered monoclinic cell was found: a =7.5834(9) Å, b = 8.1568(11) Å, c = 7.6541(8) Å, β= 102.975 (9)°.

Powder diffraction data and Rietveld refinement of metastable t-ZrO2 at low temperature

1997 ◽  
Vol 12 (2) ◽  
pp. 96-98 ◽  
Author(s):  
J. Málek ◽  
L. Beneš ◽  
T. Mitsuhashi
Keyword(s):  
Low Temperature ◽  
Rietveld Refinement ◽  
Powder Diffraction ◽  
Diffraction Data ◽  
Unit Cell ◽  
Powder Diffraction Data ◽  
Space Group ◽  
X Ray ◽  
Cell Dimensions ◽  
Unit Cell Dimensions

Indexed X-ray powder diffraction data are reported for the low temperature tetragonal ZrO2 obtained by crystallization of zirconia gel. The structure was refined by the Rietveld technique on the basis of space group P42/nmc. Refined unit cell dimensions are a = 3.5984(5) Å, c = 5.152(1) Å, V = 66.71 Å3, Dx=6.135 g/cm3, F18=62 (0.012, 24), RP=8.99, Rwp=11.48, RB=3.13.

Powder diffraction data for new bismuth yttrium ytterbium oxides by XRD

2009 ◽  
Vol 24 (1) ◽  
pp. 53-55
Author(s):  
M. Alizadeh ◽  
K. Ahmadi ◽  
A. Maghsoudipour
Keyword(s):  
Powder Diffraction ◽  
Diffraction Data ◽  
Diffraction Method ◽  
Solid State Reaction Method ◽  
Powder Diffraction Data ◽  
X Ray Diffraction ◽  
X Ray ◽  
Lattice Constants ◽  
Cell Dimensions ◽  
Unit Cell Dimensions

X-ray powder diffraction data for three new bismuth yttrium ytterbium oxide compounds synthesized by solid-state reaction method are reported. The unit-cell dimensions were determined from X-ray diffraction method using Cu Kα radiation and evaluated by indexing programs. The cubic δ-Bi2O3 phase was identified to be the sole crystalline phase in Bi0.82Y0.09Yb0.09O1.5, Bi0.82Y0.12Yb0.06O1.5, and Bi0.82Y0.06Yb0.12O1.5 with lattice constants of a=5.5110(3), 5.5154(2), and 5.5113(2) Å, respectively.

X-ray powder diffraction data and crystal data of polymorphic form 2 of carnidazole

2006 ◽  
Vol 21 (1) ◽  
pp. 56-58 ◽  
Author(s):  
Hector Novoa de Armas ◽  
Oswald M. Peeters ◽  
Norbert Blaton ◽  
Dirk J. A. De Ridder ◽  
Henk Schenk
Keyword(s):  
Powder Diffraction ◽  
Diffraction Data ◽  
Polymorphic Form ◽  
Crystal Data ◽  
Powder Diffraction Data ◽  
X Ray ◽  
Synchrotron Powder Diffraction ◽  
Cell Dimensions ◽  
Unit Cell Dimensions ◽  
Monoclinic Cell

The indexed powder diffraction pattern and related crystallographic data for polymorphic form 2 of carnidazole (C8H12N4O3S) are reported, as a first step in the structure determination by powder diffraction methods. The unit cell dimensions were determined from high resolution synchrotron powder diffraction data (λ=0.079 998 0 nm) and evaluated by indexing programs. The monoclinic cell found for this polymorph is a=1.3908(2) nm, b=08094(2) nm, c=1.0645(2) nm, β=110.82(2)°,V=1.12015(27)nm3, Z=4, Dx=1.445 Mg∕m3.

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