Synthesis and thermal analysis of tetraethylammonium bromochlorocobaltates(II) [Et4N]2[CoBrnCl4−n]
摘要:
New mixed-ligand tetraethyl ammonium halogenocobaltates(II) of general formula [Et4N](2)[CoBrnCl4-n] have been synthesized. Their thermal properties were characterized on the basis of the TG and DTG curves taken in argon and derivatograms recorded in static air. Some products of successive decomposition steps were identified based on their IR, FIR and VIS spectra as well as the results of elemental analysis. The influence of the nature of the complex anion and oven atmosphere on the progress of thermal decomposition of the compounds has been discussed. (c) 2007 Elsevier B.V. All rights reserved.
investigates reactive ball milling synthesis of a single phase metastable Co 3 C compound from starting mixtures of cobalt and graphite powders under argon and nitrogen environments. It reports their phase formations, magnetic, and structural properties. Regardless of the starting powder composition (25.0 or 33.3 at.% C) and milling atmosphere, reactive ball milling leads to the formation of the Co 3
摘要 本研究研究了在氩气和氮气环境下从钴和石墨粉末的起始混合物反应球磨合成单相亚稳态 Co 3 C 化合物。它报告了它们的相形成、磁性和结构特性。无论起始粉末组成(25.0 或 33.3 at.% C)和研磨气氛如何,反应性球磨都会导致形成具有正交结构的 Co 3 C 化合物。随着 Co 3 C 化合物开始形成,起始混合物的矫顽力首先随着研磨时间增加,随后由于进一步研磨引起的结构缺陷而降低。含有较高石墨的起始粉末混合物产生较高的峰值矫顽力值和较高的转变速率。
Magnetic properties of Co<sub>2</sub>C and Co<sub>3</sub>C nanoparticles and their assemblies
作者:Kyler J. Carroll、Zachary J. Huba、Steven R. Spurgeon、Meichun Qian、Shiv N. Khanna、Daniel M. Hudgins、Mitra L. Taheri、Everett E. Carpenter
DOI:10.1063/1.4733321
日期:2012.7.2
Nano-composite material consisting of Co2C and Co3Cnanoparticles has recently been shown to exhibit unusually large coercivities and energy products. Experimental studies that can delineate the properties of individual phases have been undertaken and provide information on how the coercivities and the energy product change with the size and composition of the nanoparticles. The studies indicate that while