通过魔角旋转31P NMR对两种磷化镉形式进行表征。

Characterization of two forms of cadmium phosphide by magic-angle spinning 31P NMR.

作者信息

Holl S M, Kowalewski T, Schaefer J

机构信息

Department of Chemistry, Washington University, St. Louis, MO 63130, USA.

出版信息

Solid State Nucl Magn Reson. 1996 Feb;6(1):39-46. doi: 10.1016/0926-2040(95)01200-1.

DOI:10.1016/0926-2040(95)01200-1

PMID:8925264

Abstract

Annealing of commercial grade cadmium phosphide (CD3P2) at 600 K produces a material which, in magic-angle spinning spin-lattice 31P NMR relaxation experiments, has broad lines and multiple T1 values. By contrast, sublimation at 900 K results in a crystalline material with narrow lines and a single T1. However, both materials have the same Cd-P lattice spacings as determined by rotational-echo, double-resonance 31P NMR with 113Cd dephasing. Both materials also have closely similar X-ray diffraction powder patterns. These results are interpreted in terms of a distribution of lattice vacancies in the annealed material, creating structural heterogeneity but with no substantial change in lattice parameters from those of the sublimed cadmium phosphide.

摘要

商业级磷化镉（CD3P2）在600 K下退火会产生一种材料，在魔角旋转自旋晶格31P NMR弛豫实验中，该材料具有宽谱线和多个T1值。相比之下，在900 K下升华会得到一种具有窄谱线和单一T1的晶体材料。然而，通过113Cd去相的旋转回波双共振31P NMR测定，这两种材料具有相同的Cd-P晶格间距。这两种材料还具有非常相似的X射线衍射粉末图谱。这些结果可通过退火材料中晶格空位的分布来解释，这会产生结构异质性，但晶格参数与升华后的磷化镉相比没有实质性变化。