D.E. Partin

The structures and crystal chemistry of magnesium chloride and cadmium chloride

Abstract The crystal structures of MgCl2 and CdCl2 have been refined using powder X-ray diffraction data. They have space group R 3 m . For magnesium chloride a = 3.6363(1) A, c = 17.6663(5) A, V = 202.31 A3, Dx = 2.35 g cm−3, Mg 0,0,0; Cl 0,0,0.25784(8), and for cadmium chloride a = 3.8459(1) A, c = 17.4931(4) A, V = 224.07 A3, Dx = 4.08 g cm−3, Cd 0,0,0; Cl 0,0,0.2520(1). d(MgCl) = 2.4873(6) A (6×), d(CdCl) = 2.637(1) (6×). The structures and their relationship to that of fluorite are discussed within the framework of a simple Born-Mayer model.

Synthesis and Neutron Diffraction Study of Na3WN3 and Na3MoN3

We have used our ambient pressure method for the synthesis of ternary alkali metal nitrides to synthesize a new class of nitrides, Na3MN3 (M = Mo or W). These compounds were synthesized from the metal nitride and NaNH2 at 500°C under flowing ammonia at atmospheric pressure. The structures were examined using X-ray powder diffraction and neutron powder diffraction and were found to be identical with that obtained from the single crystal prepared at high pressure by Ostermann, Zachwieja, and Jacobs.

The crystal structure of Sr(OD)2

Abstract The crystal structure of Sr(OD) 2 has been determined from a Reitveld refinement of time-of-flight neutron diffraction data, and the deuterium atom positions have been determined for the first time. The structure is orthorhombic: Pnma , a = 9.8269(5) A, b = 3.9051(2) A, c = 6.0733(3) A, V = 233.06 A 3 , D x = 3.466 g cm −3 , R wp = 3.93%, R p = 2.95%, reduced X 2 = 4.774 for 81 variables. Although the data were collected at 12 K, the H atoms have large thermal parameters suggesting the possibility of some disorder. Relationships of the structure to the structures of YOOH, SrBr 2 , SrI 2 , and SrBr 2 · H 2 O are discussed.

Synthesis and neutron diffraction study of Na[sub 3]WN[sub 3] and Na[sub 3]MoN[sub 3]

We have used our ambient pressure method for the synthesis of ternary alkali metal nitrides to synthesize a new class of nitrides, Na3MN3 (M = Mo or W). These compounds were synthesized from the metal nitride and NaNH2 at 500°C under flowing ammonia at atmospheric pressure. The structures were examined using X-ray powder diffraction and neutron powder diffraction and were found to be identical with that obtained from the single crystal prepared at high pressure by Ostermann, Zachwieja, and Jacobs.

Regular ArticleSynthesis and Neutron Diffraction Study of Na3WN3 and Na3MoN3

We have used our ambient pressure method for the synthesis of ternary alkali metal nitrides to synthesize a new class of nitrides, Na3MN3 (M = Mo or W). These compounds were synthesized from the metal nitride and NaNH2 at 500°C under flowing ammonia at atmospheric pressure. The structures were examined using X-ray powder diffraction and neutron powder diffraction and were found to be identical with that obtained from the single crystal prepared at high pressure by Ostermann, Zachwieja, and Jacobs.