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巡游铁磁体SrRuO3磁性的Preisach描述

侯登录 , 姜恩永 , R.M.Roshko , 杨连祥 , 唐贵德 , 聂向富

材料研究学报 doi:10.3321/j.issn:1005-3093.2002.06.004

测量了巡游铁磁体SrRuO3的零场冷却(ZFC)和加场冷却(FC)的磁化强度随温度的变化关系,以及不同温度下的磁滞回线.考虑了热涨落和自由能壁垒随温度的变化,改进了Preisach模型并对测量数据进行了拟合.数值模拟再现了测量结果的变化规律,包括在不同温度下的磁滞回线和在不同外磁场下的ZFC和FC磁化强度曲线等.对拟合出的巴克豪森跳跃谱进行了讨论.

关键词: Preisach模型 , 铁磁性材料 , 不可逆过程 , 磁滞回线 , 磁化强度

Magnetic properties of R2Fe14M3 compounds with M=Ga and Si; R=Y, Nd, Sm, Gd, Tb, Dy, Ho, Er and Tm

Solid State Communications

Samples with composition R2Fe14M3 (M = Ga and Si; R = Y, Nd, Sm, Gd, Tb, Dy, Ho, Er and Tm) have been prepared by are-melting. Crystal-structure studies have shown that the prepared samples are single phase with the rhombohedral Th2Zn17 and/or the hexagonal Th2Ni17 structure. Substitution of Ga for Fe in R2Fe17 leads to an increase of the unit-cell volume, whereas Si substitution reduces the unit-cell volume. The Curie temperatures of the R2Fe14Ga3 and R2Fe14Si3 compounds are much larger than those of the corresponding R2Fe17 compounds. The Fe moment decreases upon Ga or Si substitution. The compounds R2Fe14Ga3 and R2Fe14Si3 With R = Er and Tm exhibit a spin-reorientation transition at low temperature. (C) 1997 Elsevier Science Ltd.

关键词: neutron-diffraction;solid-solutions;substitution;anisotropy;nd2fe17

石横特钢R9m连铸工艺优化和设备改进

刘欣

连铸 doi:10.3969/j.issn.1005-4006.2006.04.004

为提高优质钢铸坯质量,石横特钢厂对R9m方坯连铸机进行了设备改进和工艺优化.应用表明,产品结构优化,铸坯的气体含量和夹杂物的含量大大降低,铸坯低倍组织改善,杜绝了中间裂纹、鼓肚等缺陷,降低了铸坯脱方、疏松、缩孔、重接等缺陷的概率.

关键词:

承德建龙R10m合金钢方坯连铸机的设计性能及技术特点

刘阳春 , 顾兴钧 , 廖辉明 , 冯小明

连铸 doi:10.3969/j.issn.1005-4006.2005.05.003

介绍承德建龙钢铁有限公司R10m合金钢方坯连铸机的主要性能、设备组成和技术特点.

关键词:

安钢烧结厂360m2烧结机R控制系统研制及应用

付朝云 , 邢建民 , 李小华 , 王云飞 , 刘运庆

金属世界 doi:10.3969/j.issn.1000-6826.2007.06.004

介绍了安钢360m2烧结机近两年来提高R采取的新技术、新工艺、加强管理的措施及获得的效果.

关键词: 烧结机 , R , 控制系统

R12m弧形连铸机生产大截面特殊钢圆坯的工艺实践

刘谦 , 李峰 , 蔡燮鳌

连铸

对兴澄特钢在R12 m小弧形连铸机上生产大截面及超大截面特殊钢圆坯的设备技术改造以及相关工艺的改进作了介绍和分析.

关键词: 弧形连铸机 , 大截面 , 特殊钢 , 圆坯

12Cr2M01R压力容器钢动态CCT曲线研究

胡海江 , 周明星 , 张益 , 王敏 , 徐光

材料与冶金学报

在Gleeble-1500热模拟机上利用热膨胀法测定了12Cr2Mo1R压力容器钢的动态连续冷却转变(CCT)曲线,观察和分析了不同冷却速度下的相变和组织,绘制了实验钢种的动态CCT曲线.实验结果表明,奥氏体变形后,铁素体和珠光体转变区向左上方移动,贝氏体转变温度降低,马氏体转变开始温度降低.

关键词: 压力容器钢 , 动态CCT曲线 , 热膨胀法 , 相变

R-line thermal shift and thermal broadenings of R, R' and B lines for ruby

Communications in Theoretical Physics

The unified theoretical calculation of thermal shifts (TS) of R-1 and R-2 lines and thermal broadenings (TB) of R, R' and B lines for ruby was carried out for the first time. The calculated results are in very good agreement with a great number of experimental data. Especially by using quantum theory and taking into account all the admixtures of wavefunctions within d(3) electronic configuration, all the Gamma M in electron-phonon interaction (EPI), the electronic energy spectrum and lattice-vibration Spectrum, the very important contributions to TS and TB from single-phonon direct process were theoretically calculated in detail. The microscopic essentials of various contributions are revealed, and the mistakes in previous work are remedied.

关键词: diamond anvil cell;pressure measurement;spectroscopy;temperatures