X-ray structural study of silasesquioxanes. The crystal structure of octa (allylsilasesquioxane)

1982 ◽  
Vol 22 (5) ◽  
pp. 737-740 ◽  
Author(s):  
N. V. Podberezskaya ◽  
I. A. Baidina ◽  
V. I. Alekseev ◽  
S. V. Borisov ◽  
T. N. Martynova
Keyword(s):  
Crystal Structure ◽  
Structural Study ◽  
X Ray

Synthesis and structural study from X-ray powder diffraction of Pb0.5Th2(PO4)3

1997 ◽  
Vol 12 (2) ◽  
pp. 76-80 ◽  
Author(s):  
A. El-Yacoubi ◽  
R. Brochu ◽  
A. Serghini ◽  
M. Louër ◽  
M. Alami Talbi ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Thermal Stability ◽  
Structural Study ◽  
Powder Diffraction ◽  
Diffraction Data ◽  
Structure Type ◽  
Powder Diffraction Data ◽  
Monoclinic Symmetry ◽  
X Ray ◽  
Thermal Stability Of

A new mixed lead thorium phosphate, Pb0.5Th2(PO4)3, has been isolated in the system PbO–ThO2–P2O5. Its crystal structure (monoclinic symmetry, a=17.459(1) Å, b=6.8451(4) Å, c=8.1438(5) Å, β=101.247(5)°, space group C2/c) has been determined from conventional monochromatic X-ray powder diffraction data. The structure is related to the MITh2(PO4)3 structure type. Lead atoms are located in the channels parallel to the c axis, out of the twofold axis for 0.97 Å, and are statistically distributed on a quarter of crystallographic positions. The thermal stability of this material is greater than that of the monazite-type compound PbTh(PO4)2.

X-ray structural study of silasesquioxanes. II. Crystal structure of decamethylsilasesquioxane

1980 ◽  
Vol 21 (3) ◽  
pp. 352-355 ◽  
Author(s):  
I. A. Baidina ◽  
N. V. Podberezskaya ◽  
S. V. Borisov ◽  
V. I. Alekseev ◽  
T. N. Martynova ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Structural Study ◽  
X Ray

X-ray structural study of silasesquioxanes. Crystal structure of octaethylsilasesquioxane ? A new member of the series of framework silasesquioxanes with the composition [RSiO1.5]8

1982 ◽  
Vol 23 (3) ◽  
pp. 422-431 ◽  
Author(s):  
N. V. Podberezskaya ◽  
S. A. Magarill ◽  
I. A. Baidina ◽  
S. V. Borisov ◽  
L. �. Gorsh ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Structural Study ◽  
X Ray

scholarly journals Crystal structure and revision of the chemical formula of georgiadesite, Pb4(AsO3)Cl4(OH)

2000 ◽  
Vol 64 (5) ◽  
pp. 879-884 ◽  
Author(s):  
M. Pasero ◽  
D. Vacchiano
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Structural Study ◽  
Diffraction Data ◽  
Chemical Formula ◽  
X Ray Diffraction ◽  
X Ray ◽  
Trigonal Prisms

AbstractThe crystal structure of the rare secondary lead mineral georgiadesite has been solved from single-crystal X-ray diffraction data (R = 0.071). The structure can be visualized in terms of alternating puckered (100) layers of [Pbϕ6] octahedra and [Pbϕ8] bicapped trigonal prisms (ϕ = generic anion). Lead also occurs in irregular, lopsided polyhedra. This structural study shows unambiguously that arsenic occurs as As3+ and not as As5+. The chemical formula of georgiadesite has therefore been revised, on structural grounds, to Pb4(AsO3)Cl4(OH).

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