搜索结果: 1-15 共查到“理学 Mossbauer”相关记录50条 . 查询时间(0.099 秒)
摘要 铁的简单配合物及羰基化合物的Mossbauer研究已有报道, 对有机铁化合物的相应工作进行得较少. 本文报道一类具有夹心结构的有机铁化合物的^5^7FeMossbauer参数及其与结构的一些关系.
摘要 应用经过改进的实验方法制得均匀球状Fe3O4胶体粒子, 通过对多种Fe3O4粒子的Mossbauer测量并结合发析, 我们发现, 在制备过程中, 反应浓度、加液次序以及陈化时间的不同对所生成的Fe3O4晶体的基本骨架与结构影响极小, 而随着陈化时间的不断增加, Fe3O4粒子的组成将逐渐接近化学计量, 以这些实验结果及文献报道为基础, 本文讨论了均匀Fe3O4胶体粒子的形成机理。
均匀Fe~3O~4胶体粒子形成机理II. 低温Mossbauer谱研究
氧化镁 胶体 穆斯堡尔谱法 形成机理
2007/12/23
摘要 在液氮温度下, 测定了均匀Fe~3O~4胶体粒子制备过程中陈化时间为1小时内的不同时间所得样品的Mossbauer谱。结果表明, γ-FeOOH为Fe~3O~4均匀胶粒形成过程的中间产物, 并提出均匀Fe~3O~4胶粒的形成机理。
摘要 本文合成了两个二茂铁基查耳酮系化合物3b-3eC5H5FeC5H4CO(CH=CH)nC6H5(n=1,2,3,4)和6a-6cC5H5FeC5H4(CH=CH)nCOC6H5(n=0,1,2)。为了研究这类三岔共轭体系的结构效应,我们用Mossbauer效应为探针, 研究了二茂铁基Fe核周围的电子云分布情况。并用同系因子(1/a)^1^/^N考查了Mossbauer谱参数QS和IS的同系递...
合成了钼磷铁杂多黄(NH4)4[PFeMo11O40H2]·9H2O和杂多蓝(NH4)4[PFeMo11O40H3]·11H2O的铵盐晶体, 用^5^7Fe同位素增丰Mossbauer谱法, 结合磁化率测定, 研究其结构与性质, 并讨论了四极分裂值Q2和Keggin结构杂多阴离子中MO6(M=Mo, Fe)八面体畸变大小的关系, 进一步证实Keggin结构杂多蓝阴离子中Mo(V)-O-Fe(III...
Mossbauer and Infrared Study of Heat-Treated Nontronite
CMS Clay SWa-1 Dehydroxylation Infrared Spectra Lithium Migration Mossbauer Spectra Nontronite Superparamagnetic Behavior
2011/12/2
Abstract: The Mössbauer and infrared spectra of Li- and Rb-saturated nontronites from Washington, USA (SWa-1), heat treated at different temperatures, were measured. The Mössbauer results sh...
Iron-Oxide Mineralogy of a Mollisol from Argentina: A Study by Selective-Dissolution Techniques, X-Ray Diffraction, and Mossbauer Spectroscopy
Ammonium-Oxalate Dissolution Treatment Chemical Analysis Dithionite-Citrate-Bicarbonate Dissolution Treatment Dithionite-Ethylenediaminetetraacetic Acid Dissolution Treatment
2011/12/6
Abstract: Selective-dissolution techniques by ammonium oxalate (OX), dithionite-citrate-bicarbonate (DCB), and dithionite-ethylenediaminetetraacetic acid (D-EDTA), and X-ray diffraction and M鰏sbauer s...
Inclusive chemical characterization of tourmaline: Mossbauer study of Fe valence and site occupancy
Inclusive chemical characterization Mossbauer Fe site occupancy
2012/4/1
We report here the results of a series of inclusive chemical characterizations, including all elements except oxygen, for a suite of 54 tourmaline samples. A combination of analytical techniques was u...
Abstract: Divalent tin has been intercalated into montmorillonite by reacting partially hydrolyzed solutions of SnCl2 under aerobic conditions at pH = 2.8 with aqueous dispersions of the smectite mine...
Crystal Structure Refinement and Mossbauer Spectroscopy of an Ordered, Triclinic Clinochlore
Cation Ordering Chlorite Clinochlore Crystal Structure Mossbauer
2011/12/22
Abstract: The crystal structure of a natural, ordered IIb-4 triclinic clinochlore has been refined in space group C1¯ from 4282 unique X-ray intensity measurements of which 3833 are greater than ...
57Fe Mossbauer Effect Study of Al-Substituted Lepidocrocites
Al Substitution Lepidocrocite Mossbauer Spectra
2011/12/23
Abstract: Seven Al-containing lepidocrocite samples, γ-Fe1−xAlXOOH, prepared from FeCl2/Al(NO3)3 solutions with initial Al/(Al + Fe) mole ratios Ci of 0.0025, 0.01, 0.025, 0.05, 0.075, 0.10 and ...
Influence of Nonstoichiometry and the Presence of Maghemite on the Mossbauer Spectrum of Magnetite
Magnetite Mossbauer effect Nonstoichiometric magnetite
2011/12/28
Several samples of large- and small-particle magnetite (Fe3O4), as well as its thermal decomposition products formed at different temperatures and atmospheres, have been studied extensively by Mö...
Mossbauer Spectroscopic Evidence for Citrate-Bicarbonate-Dithionite Extraction of Maghemite from Soils
Mossbauer spectroscopy Soil genesis
2011/12/1
Abstract: In a previous paper, we used powder X-ray diffraction and changes in magnetic susceptibility to argue the importance of pedogenic maghemite to soils and the efficacy of the chemical extracta...
Variable-Temperature Mossbauer Spectroscopy of Nano-Sized Maghemite and Al-Substituted Maghemites
Al substitution Maghemite Mossbauer effect
2011/12/28
Synthetic aluminum-substituted maghemite samples, γ-(Fe1-xAlx)2O3, have been prepared by thermal decomposition of Al-lepidocrocite (γ-Fe1-xAlxOOH), with x = 0, 0.04, 0.06, 0.14 and 0.18. The particles...
Studies of the Reactivity of the Ferrihydrite Surface by Iron Isotopic Exchange and Mossbauer Spectroscopy
Adsorption Arsenate Dissolution kinetics Ferrihydrite Iron octahedra Mossbauer spectroscopy Reactive sites Solubility Surface chemistry
2011/12/1
Abstract: Two-line ferrihydrite is an important adsorbent of many toxics in natural and anthropogenic systems; however, the specific structural sites responsible for the high adsorption capacity are n...