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Abstract

LABORATORY NOTES 993platform at the rear supports an auxiliary beam stop, S, of tungsten, mercury or other heavy element that may be required if hard radiation is present in the incident beam.Minor features of the design can be deduced from the drawings. The prototype allowed 20 values from 0 to 60°; it entirely contained unwanted Laue reflections and tracked accurately over the wavelength range tested. It has been used when scattering in the horizontal plane but can be oriented in any direction without loss of performance.

Gallophosphonates Containing Alkali Metal Ions. 2.1 Synthesis and Structure of Gallophosphonates Incorporating Na+ and K+ Ions

“…In the case of 3 , the molecule crystallizes in the chiral space group P 6 3 22. A search for any other higher symmetry with the program INVERS, which uses the Le Page algorithm, confirmed the acentric chiral space group.…”

Crystal structure of 2-pyridiniumferrocene tetrafluoroborate Fe(?5-C5H5)[(?5-C5H4)(2-C5H4NH+)](BF 4 ? )

“…After filtration and evaporation to dryness, the residue obtained was recrystallized from methylene chloride/diethyl ether at 0~ to yield 0.095 g of red crystals of the title compound 2. An additional 0.030 g was recovered following concentration of the mother solution, readdition of diethyl ether, and cooling to 0~ A crystal of complex 2, 0.05 • 0.10 x 0.30 mm, was mounted on a Enraf-Nonius CAD4 diffractometer controlled by the NRCCAO software (Le Page et al, 1986). C15HlaBNF4Fe, Fw = 350.93, monoclinic, P21 / a, a = 7.984(1), b = 9.981(2), c = 18.220(2) A, /3 = 102.31(1) ~ , V = 1418.5 A3, Z = 4, Dc = 1.643 Mb 9 m -3, /~(CuKc~) = 9.1 mm -l. The three intensity standards (4,0,0; 0,4,0; 0,0,6) monitored during the data collection did not vary significantly.…”

Aluminum Incorporation in Cuprate Perovskites

“…The crystals were measured using a Nonius CAD-4 n-axis diffractometer with MoK. radiation, driven by the NRCCAD diffractometer program package [6]. Lattice parameters were determined by measuring absolute 20 values of at least 25 reflections with 20>50 *, where KaI and KCl2 are separated.…”