STRUCTURE AND HYDRAULICITY OF C_2F FORMED BY RAPID BURNING

The structure and the hydraulicity of C_2Fformed by the rapid burnign have been studied with the helpof XRD,IR, Mossbauer spectra,the combined water and oth-er analytical means. The technique of the rapid burning canchange the crystal structure of C_2F.There exist more octahe-dra (Fe~3~ ),less covalent bonding and more crystal defects inthe structure of C_2F. It is important that the hydraulicity ofC_2F can be enhanced by means of the technique of the rapidburning.     

ORIGIN OF MAGNETISM STUDY ON SOME COMMERCIAL Fe_2O_3

Six kinds of typical commercial Fe2O3 were sampled and divided into two groups A and B. according to the magnetic measurement results. The samples of group A are of susceptibility about 10-4 and the specific saturation magnetization σs 0.2-0.3 A.M2/kg, being consistent with the feature of antiferromagnetic α-Fe2O3. While the samples of group B display strong magnetism with susceptibility 10-1-10-2 and σs 1.7-12 A.M2 /kg. Mossbauer spectra of the samples were investigated at room temperature in an external magnetic field. It is suggested there is the y - Fe2O3 phase in the group B according to the relative intensities of spectra I(2,5)/I(3,4). This was proved by the Mossbauer spectra for the mixed samples A with γ-Fe2O3 at various contents and by measuring the dependence of specific saturation magnetization on temperature for the samples of group B.     

ZnO对硅酸盐水泥熟料煅烧的影响

研究表明ＺｎＯ是一种较好的矿化剂，可加快水泥熟料的形成和影响熟料相组成。并测定了ＺｎＯ在熟料各相中的分配。     

快速评定晶粒度方法

在铁氧体等各种磁性材料的微观结构分析中,最常用也最直观的是测量它的晶粒度。常用的方法先是照像,然后在像片上截取若干线条,用平均弦径公式计算:     

缺铁量对YGdIg穆斯堡尔谱和磁性的影响

一、前言钇钆铁石榴石(YGdIG),是一种通用微波铁氧体材料,微波器件的插入损耗与它的铁磁共振线宽△H 有关,要降低△H 必需使成分尽可能地接近于正分。在     

EFFECT OF SOLVENT ON THE MAGNETIC INTERACTIONS BETWEEN Fe_3O_4 PARTICLES AND SURFACTANTS

Mossbauer spectra for 5 nm Fe3O4 particles coated with different surfactants (the polar end groups as -COONa and -SO3Na) were measured and show a significant influence on superparamagnetic relaxation with and without the solvent. Some phenomena were explained by the superparamagnetism and the surfactant hydrophilicity.     

用磁性液体观察磁畴

讨论了用磁性液体(以下简称磁液)作媒质观察磁性材料磁畴结构的可能性和现实性。指出了这种方法的有效性和实用性。具有推广价值。     

室温外磁场穆斯堡尔谱研究

利用本所研制的专用于穆斯堡尔谱测量的小型强磁场,测定了几种铁氧体材料的磁化状态,内磁场符号,磁倾角,计算了小颗粒粒度等有效工作。磁体为钕铁硼永磁,不用其它电源等外设,可在室温下进行各种实验,最大工作间隙磁场可达15kOe,是穆斯堡尔分析的有力辅助工具。