Nanostructured Materials最新文献_第6页

Novel synthesis of Al13-cluster based alumina materials al13簇基氧化铝材料的新合成

Nanostructured Materials Pub Date : 1999-11-01 DOI: 10.1016/S0965-9773(99)00412-2

Mingsheng Wang, M. Muhammed

引用次数: 52

Refinement of α-Fe and its improvement on magnetic properties of melt-spun nanocomposite Pr2Fe14B/α-Fe magnets by low wheel speed spinning α-Fe的细化及其对熔融纺纳米复合Pr2Fe14B/α-Fe磁体磁性能的改善

Nanostructured Materials Pub Date : 1999-11-01 DOI: 10.1016/S0965-9773(99)00420-1

Z Chen , Y Zhang , G.C Hadjipanayis , Q Chen , B Ma

{"title":"Refinement of α-Fe and its improvement on magnetic properties of melt-spun nanocomposite Pr2Fe14B/α-Fe magnets by low wheel speed spinning","authors":"Z Chen , Y Zhang , G.C Hadjipanayis , Q Chen , B Ma","doi":"10.1016/S0965-9773(99)00420-1","DOIUrl":"https://doi.org/10.1016/S0965-9773(99)00420-1","url":null,"abstract":"<div>Nanocomposite Pr2Fe14B/α-Fe magnets with uniform microstructure and enhanced magnetic properties have been synthesized by melt-spinning a Pr8Fe86B6 alloy at low wheel speed range. Microstructural and magnetic studies showed that there is an optimum wheel speed (about 16.7 m/s) at which a uniform Pr2Fe14B/α-Fe structure with fine α-Fe grains (about 10 nm) is developed directly from the melt. Lower speed gives larger grains for both the 2:14:1 and α-Fe, while higher speed leads to the appearance of an amorphous phase which will result in a Pr2Fe14B/α-Fe structure with larger α-Fe grains after a subsequent crystallization annealing. Magnetic properties obtained under the optimum-quenching followed by a subsequent annealing are Ms = 176.6 emu/g, Mr = 118.2 emu/g, Mr/Ms = 0.67, Hc = 5.4 kOe and (BH)m = 12.6 MGOe. The coercivity and energy product are about 20% higher than those obtained by crystallization of over-quenched samples due to the refinement of α-Fe size which leads to an enhanced exchange coupling between Pr2Fe14B and α-Fe.</div>","PeriodicalId":18878,"journal":{"name":"Nanostructured Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1999-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0965-9773(99)00420-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91746241","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Properties of the Rayleigh-distribution for particle sizing from SAS experiments SAS实验中颗粒粒度的瑞利分布特性

Nanostructured Materials Pub Date : 1999-11-01 DOI: 10.1016/S0965-9773(99)00418-3

Wilfried Gille

引用次数: 4

Solvothermal synthesis to NiE2 (E = Se, Te) nanorods at low temperature 低温溶剂热合成NiE2 (E = Se, Te)纳米棒

Nanostructured Materials Pub Date : 1999-11-01 DOI: 10.1016/S0965-9773(99)00395-5

Bin Li , Yi Xie , Jiaxing Huang , Huilan Su , Yitai Qian

引用次数: 23

Correlation between microstructure, particle size, dielectric constant, and electrical resistivity of nano-size amorphous SiO2 powder 纳米非晶SiO2粉体的微观结构、粒径、介电常数与电阻率的关系

Nanostructured Materials Pub Date : 1999-11-01 DOI: 10.1016/S0965-9773(99)00398-0

T. Tepper, S. Berger

引用次数: 24

Preparation and photocatalytic activity of TiO2-SiO2 binary aerogels 二氧化钛-二氧化硅二元气凝胶的制备及其光催化活性

Nanostructured Materials Pub Date : 1999-11-01 DOI: 10.1016/S0965-9773(99)00423-7

Zhongsheng Deng , Jue Wang , Yulong Zhang , Zhinong Weng , Zhe Zhang , Bin Zhou , Jun Shen , Linyan Cheng

引用次数: 30

Synthesis and TEM study of nanoparticles and nanocrystalline thin films of silver by high pressure sputtering 高压溅射法制备银纳米粒子和银纳米晶薄膜及其透射电镜研究

Nanostructured Materials Pub Date : 1999-11-01 DOI: 10.1016/S0965-9773(99)00408-0

Ramesh Chandra , Praveen Taneja , J John , Pushan Ayyub , G.K Dey , S.K Kulshreshtha

引用次数: 33

Mechanical alloying of the Ti-Al system in atmosphere of hydrogen and argon 氢、氩气氛下Ti-Al体系的机械合金化

Nanostructured Materials Pub Date : 1999-11-01 DOI: 10.1016/S0965-9773(99)00411-0

Akito Takasaki , Yoshio Furuya

{"title":"Mechanical alloying of the Ti-Al system in atmosphere of hydrogen and argon","authors":"Akito Takasaki , Yoshio Furuya","doi":"10.1016/S0965-9773(99)00411-0","DOIUrl":"https://doi.org/10.1016/S0965-9773(99)00411-0","url":null,"abstract":"<div>Three kinds of Ti-Al powders, Ti72Al28, Ti57Al43 and Ti48Al52, were mechanically alloyed by a planetary ball mill in atmosphere of argon or hydrogen gases (0.1 MPa) with alloying times up to 30 h. The mechanical alloying (MA) process as well as the phase variations of each powder after subsequent heating at 1173 K were investigated. About 5000 wppm hydrogen, which could be easily removed by a heat treatment at 800 K (heating rate was 20 K/min), was occluded in all powders during MA in the hydrogen atmosphere, whereas the mechanically alloyed powders in the argon atmosphere occluded about 1000 wppm hydrogen. In the hydrogen atmosphere, the titanium powder easily crumbled into finer particles, assisting the diffusion of aluminum into titanium (solid-solid reaction) at an early stage of the MA process and accelerating the formation of an amorphous-like phase at a longer MA process. The phase formation after heat treatment of MA powders at 1173 K could be estimated by the Ti-Al binary phase diagram without the effect of the gas atmosphere.</div>","PeriodicalId":18878,"journal":{"name":"Nanostructured Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1999-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0965-9773(99)00411-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91746582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 20

Synthesis of monodisperse Au, Pt, Pd, Ru and Ir nanoparticles in ethylene glycol 单分散Au, Pt, Pd, Ru和Ir纳米颗粒在乙二醇中的合成

Nanostructured Materials Pub Date : 1999-11-01 DOI: 10.1016/S0965-9773(99)00419-5

F. Bonet, V. Delmas, S. Grugeon, R. H. Urbina, P. Silvert, K. Tekaia-Elhsissen

引用次数: 319

Local icosahedral symmetries in Al-Mo alloys prepared by ball milling 球磨制备Al-Mo合金的局部二十面体对称性

Nanostructured Materials Pub Date : 1999-11-01 DOI: 10.1016/S0965-9773(99)00416-X

M. Monagheddu, F. Delogu, L. Schiffini, R. Frattini, S. Enzo

引用次数: 8