检索结果-南通市图书馆

SiO_2/Ta interface reaction in magnetic multilayers and its influence on Ta buffer layers

在线全文

学校读者我要写书评

暂无评论

Chinese science Bulletin 2002年第19期47卷 1601-1603页

作者： yu guanghua, MA Jidong, {1. fengwu & chai chunlindepartment of materials Physics, university of science and technology, beijing 1.0083, china Institute of Semiconductor, Chinese Academy of sciences, beijing 1.0083, china Department of materials Physics University of Science and Technology Beijing 100083 China Institute of Semiconductor Chinese Academy of Sciences Beijing 100083 China

Ta is often used as a buffer layer in magnetic multilayers. In this study, Ta/Ni81.e1./Ta multilayers were deposited by magnetron sputtering on sing-crystal Si with a 300-nm-thick SiO2 film. The composition and chemical states at the interface region of SiO2/Ta were studied using the X-ray photoelectron spectroscopy (XPS) and peak decomposition technique. The results show that there is an "intermixing layer" at the SiO2/Ta interface due to a thermody-namically favorable reaction: 1. SiO2+37 Ta = 6 Ta2O5 + 5 Ta5Si3. Therefore, the Ta buffer layer thickness used to induce NiFe (1.1. texture increases.

关键词： SiO2/Ta interface interface reaction X-ray photoelectron spectroscopy (XPS).

XPS Studies of Chemical States of NiO/NiFe Interface

在线全文

学校读者我要写书评

暂无评论

Journal of university of science and technology {1. 2001年第4期8卷 270-273页

作者： guanghua yu, Chunlin chai, fengwu zhu, Jimei Xiao, Wuyan Lai 1)materials science and Engineering School, university of science and technology beijing, beijing 1.0083, china 2)Institute of Physics. Chinese Academy of sciences. beijing, 100080, china Univ Sci & Technol beijing Sch Mat Sci & Engn Beijing 100083 Peoples R China Chinese Acad Sci Inst Phys Beijing 100080 Peoples R China

Ta/NTiO/NiFe/Ta multilayers were prepared by radio frequency reactive and dc magnetron sputtering. The exchange coupling field between NiO and NiFe reached 9.6 x 1.(3) A/m. The compositions and chemical states at the interface region of NiO/NiFe were studied using the X-ray photoelectron spectroscopy (XPS) and peak decomposition technique, The results show that there are two thermodynamically favorable reactions at NiO/NiFe interface: NiO+Fe = Ni + FeO and 3NiO+2Fe =3 Ni+Fe2O3. The thickness of the chemical reaction area estimated by angle-resolved XPS was about 1.1.5 nm. These interface reaction products appear magnetic defects, and the exchange coupling field H-ex and the coereivity H-c of NiO/NiFe are affected by these defects.

关键词： chemical states exchange coupling field H-ex coercivity H-c X-ray photoelectron spectroscopy (XPS)

Spherical nanoindentation stress–strain responses of SIMP steel to synergistic effects of irradiation by H and He ions

在线全文

学校读者我要写书评

暂无评论

Nuclear science and Techniques 2022年第6期33卷 139-147页

作者： Peng Jin Tie-Long Shen Jing Li yu-Shan Yang Jian-Long {1. Ya-Bin zhu Ming-Huan Cui Chao Liu Tong-Min Zhang Long Kang Jun Li Jin-yu Li Shuo-Xue Jin Xing-Zhong Cao Zhi-Guang Wang Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China School of Nuclear science and {1. University of Chinese Academy of SciencesBeijing 100049China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China

A novel Fe-1.Cr ferritic/martensitic steel called SIMP was chosen to investigate synergistic effects of H and He on the mechanical properties of structural materials for innovative nuclear energy systems. Sequential and separate irradiation experiments on SIMP steel specimens at room temperature using H and He ions with various energy levels were conducted to produce an ion deposition plateau at 300-650 nm. The indentation stress-strain responses were examined using spherical nanoindentation tests after the irradiation experiments. It was found that the sequential irradiation by He and H produced a higher indentation yield stress than separate irradiation, indicating that the hardening was enhanced by the synergy of the H and He irradiation. The micro-mechanism responsible for enhancing the hardening of the SIMP steel through the H and He synergy was investigated using Doppler broadening spectroscopy detection and transmission electron spectroscopy observations.

关键词： H/He irradiation Spherical nanoindentation Bubbles Dislocation loops

在线全文

学校读者我要写书评

暂无评论

成型压力对相似材料力学性质影响机理

西安科技大学学报 2019年第2期39卷 194-200页

作者：柴敬刘永亮杨玉玉张丁丁张吉朱绪宝马哲西安科技大学能源学院陕西西安710054 西安科技大学西部矿井开采及灾害防治教育部重点实验室陕西西安710054

为探究成型压力对相似材料力学性质的影响机理,选择IBSCM新型相似材料,运用正交试验方法系统性的研究了成型压力和配比对相似材料密度、抗压强度、弹性模量、泊松比的影响;采用极差分析和多元回归分析等方法对结果进行了分析。结果表明... 详细信息

为探究成型压力对相似材料力学性质的影响机理,选择IBSCM新型相似材料,运用正交试验方法系统性的研究了成型压力和配比对相似材料密度、抗压强度、弹性模量、泊松比的影响;采用极差分析和多元回归分析等方法对结果进行了分析。结果表明:各因素对相似材料物理力学性质影响显著性由大到小依次为胶结剂浓度、成型压力、铁粉含量、石膏含量;胶结剂浓度对相似材料的抗压强度、弹性模量起控制作用;成型压力由2 MPa增大到6 MPa时,材料的密度、抗压强度、弹性模量分别增大了5. 97%,59. 1.,27. 5%,成型压力对相似材料力学性质影响较大,相似模拟实验中选择恰当的成型压力和配比是提高模拟实验相似性的关键;得到了成型压力和配比对相似材料力学参数影响的回归模型,并对模型的有效性进行了验证。

关键词：相似模拟相似材料成型压力正交试验极差分析回归分析

CeO_(2)和TiO_(2)对二硅酸锂微晶玻璃析晶及其性能的影响

在线全文

学校读者我要写书评

暂无评论

陕西科技大学学报 2022年第5期40卷 124-130,159页

作者：张佩王贻然陈宇璇许泽柴玉梅王可心朱建锋王甜郭江陕西科技大学材料科学与工程学院陕西省无机材料绿色制备与功能化重点实验室陕西西安710021

二硅酸锂微晶玻璃因为其良好的力学性能和美观性应用于牙科修复材料中.通过在SiO_(2)-Li_(2)O-K_(2)O-Al_(2)O_(3)-ZrO_(2)-P_(2)O_(5)六元二硅酸锂微晶玻璃中添加不同比例的CeO_(2),利用DSC、XRD、SEM等手段分析了CeO_(2)对SiO_(2)-Li_(2)O-K_(2)O-Al_(2)O_(3)-ZrO_(2)-P_(2)O_(5)六元二硅酸锂微晶玻璃析晶及相关性能的影响.结果表明,添加CeO_(2)可以提高二硅酸锂的结晶度,同时可以提高力学性能,样品的最大抗弯强度为320.52±26.36 MPa,最大维氏硬度为6.91.0.25 GPa,最大断裂韧性为3.00±0.1. MPa·m^(1.2).色度学中,只添加CeO_(2)的样品颜色较深,而同时添加CeO_(2)和TiO_(2)的样品则具有黄色色调,可以满足一定的临床需求.

关键词：二氧化铈二硅酸锂微晶玻璃析晶光学和力学性能

嫁接与实生金花茶的叶片和花朵营养成分分析与评价

在线全文

学校读者我要写书评

暂无评论

食品工业科技 2019年第20期40卷 329-333,347页

作者：朱成豪唐辉柴胜丰刘志新王婷李玉亮广西壮族自治区中国科学院广西植物研究所广西桂林541006 桂林医学院药学院广西桂林541004 广西桂人堂金花茶产业集团股份有限公司广西防城538021

该文研究了嫁接对金花茶营养成分的影响,拟为采用嫁接育苗方法实现金花茶资源的快速开发利用提供理论依据。以嫁接和实生金花茶的叶片、花朵为材料,依据各营养成分测定的国家标准分别对其氨基酸、主要活性物质及矿质元素的含量进行了测... 详细信息

该文研究了嫁接对金花茶营养成分的影响,拟为采用嫁接育苗方法实现金花茶资源的快速开发利用提供理论依据。以嫁接和实生金花茶的叶片、花朵为材料,依据各营养成分测定的国家标准分别对其氨基酸、主要活性物质及矿质元素的含量进行了测定和分析。结果表明,嫁接金花茶叶片中氨基酸总量和必需氨基酸总量显著高于实生金花茶(P0.05)。嫁接金花茶叶片和花朵中粗蛋白、总糖、灰分、茶多酚、茶多糖、总皂苷的含量与实生金花茶无显著差异(P>0.05);嫁接植株叶片和花朵中粗纤维、维生素C含量显著高于实生植株,总黄酮含量表现为嫁接植株叶片高于实生植株,而嫁接植株花朵低于实生植株。大部分矿质元素(K、Mg、Fe、Zn、Cu、Mo)在嫁接和实生金花茶叶片、花朵中无显著差异(P>0.05);嫁接植株叶片中Mn、V、Se含量显著低于实生植株,嫁接植株花朵中Mn、Na含量显著低于实生植株。嫁接金花茶叶片和花朵中大部分营养成分和生理活性物质的含量与实生植株的差异并不显著,因此,采用嫁接方法培育金花茶可作为满足其日益增长的原材料需要的重要补充。

关键词：金花茶嫁接实生营养成分评价