Nanostructured Materials最新文献

Nanostructured Materials 纳米材料

Nanostructured Materials Pub Date : 2020-08-18 DOI: 10.1007/978-3-030-26145-0

T. D. Thangadurai, N. Manjubaashini, Sabu Thomas, Hanna. J. Maria

引用次数: 4

Properties of Nanostructured Materials 纳米结构材料的性质

Nanostructured Materials Pub Date : 2020-01-01 DOI: 10.1007/978-3-030-26145-0_7

T. D. Thangadurai, N. Manjubaashini, Sabu Thomas, Hanna. J. Maria

引用次数: 2

Nanostructured Materials for Photonic Applications 光子应用中的纳米结构材料

Nanostructured Materials Pub Date : 2020-01-01 DOI: 10.1007/978-3-030-26145-0_14

T. D. Thangadurai, N. Manjubaashini, Sabu Thomas, Hanna. J. Maria

引用次数: 0

Threshold behavior in the formation of nanoscale silicon particles prepared by sputtering 溅射制备纳米级硅颗粒形成的阈值行为

Nanostructured Materials Pub Date : 1999-11-01 DOI: 10.1016/S0965-9773(99)00401-8

D. H. Pearson, A. Edelstein

引用次数: 7

Processing and microstructure of Nano-Mo/Al2O3 composites from MOCVD and fluidized bed MOCVD和流化床制备纳米mo /Al2O3复合材料及其微观结构

Nanostructured Materials Pub Date : 1999-11-01 DOI: 10.1016/S0965-9773(00)00433-5

Ching-Jang Lin , Chih-Chung Yang , Wen-Cheng J. Wei

{"title":"Processing and microstructure of Nano-Mo/Al2O3 composites from MOCVD and fluidized bed","authors":"Ching-Jang Lin , Chih-Chung Yang , Wen-Cheng J. Wei","doi":"10.1016/S0965-9773(00)00433-5","DOIUrl":"10.1016/S0965-9773(00)00433-5","url":null,"abstract":"<div>The process utilizing metal-organic chemical vapor deposition (MOCVD) was conducted in a fluidized Al2O3 powder bed for the preparation of nano-Mo ceramic composites. During the process, Mo species were deposited in fine Al2O3 ceramic powder using a pyrolysis of Mo carbonyl. The composition and crystallinity of the intermediate phases of Mo2CxOy, and the microstructure of the coated particles and coated layer were analyzed using XRD/SEM/TEM techniques. The granulated powder was then treated by H2 reduction, pressureless sintering or hot-pressing in a vacuum, which could achieve densities better than 99% T.D. The densification, wear, and microstructural properties of the dense nano Mo-composites were then investigated and discussed. It is seen that the nano-inclusion of Mo grains inhibited the grain growth of the alumina matrix, which had a mean grain size of either 4.9 μm or 1.2 μm, as the volume fraction of Mo increased from 0 vol% to 5 vol%. The wear resistance of the nano-Mo/Al2O3 was approximately 2 times better than that of pure Al2O3. Through an understanding of the pyrolysis of Mo(CO)6 and grain growth kinetics of Mo-species growth kinetics, the morphology and size of the Mo grains in ceramic composites can be modified.</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(00)00433-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77423848","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: 17

Preparation of nanoscale α-Al2O3 powder by the polyacrylamide gel method 聚丙烯酰胺凝胶法制备纳米级α-Al2O3粉体

Nanostructured Materials Pub Date : 1999-11-01 DOI: 10.1016/S0965-9773(99)00417-1

H. Z. Wang, L. Gao, Weiqun Li, Qiang-Bing Li

引用次数: 40

Grain growth in a nanocrystalline Ni81P19 alloy 纳米晶Ni81P19合金的晶粒生长

Nanostructured Materials Pub Date : 1999-11-01 DOI: 10.1016/S0965-9773(00)00432-3

Á. Révész , J. Lendvai , I. Bakonyi

引用次数: 6

Soft magnetic properties of nanocrystalline Ni3Fe and Fe75Al12.5Ge12.5 纳米晶Ni3Fe和Fe75Al12.5Ge12.5的软磁性能

Nanostructured Materials Pub Date : 1999-11-01 DOI: 10.1016/S0965-9773(00)00430-X

H.N. Frase , R.D. Shull , L.-B. Hong , T.A. Stephens , Z.-Q. Gao , B. Fultz

{"title":"Soft magnetic properties of nanocrystalline Ni3Fe and Fe75Al12.5Ge12.5","authors":"H.N. Frase , R.D. Shull , L.-B. Hong , T.A. Stephens , Z.-Q. Gao , B. Fultz","doi":"10.1016/S0965-9773(00)00430-X","DOIUrl":"https://doi.org/10.1016/S0965-9773(00)00430-X","url":null,"abstract":"<div>Magnetization curves were measured on Ni3Fe and Fe75Al12.5Ge12.5 nanocrystals of different grain sizes. These materials were prepared by high-energy ball milling, followed by annealing at various temperatures. The alloy compositions were chosen because they have low magnetostriction in bulk form, implying that strain in the samples should have little effect on their magnetic properties. The M-H magnetization curves were used to obtain the coercivity, the maximum permeability, and the saturation magnetization. Differences in these magnetic properties were related to changes in grain size and internal RMS strain. In spite of the low bulk magnetostriction of these materials, the internal stress controlled the coercivity. The changes in permeability, however, were not as expected from the trend in grain size. We suggest that the powder morphology, plays an important role in determining the soft magnetic properties of these nanocrystalline alloys.</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(00)00430-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91746230","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

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

{"title":"Correlation between microstructure, particle size, dielectric constant, and electrical resistivity of nano-size amorphous SiO2 powder","authors":"T Tepper , S Berger","doi":"10.1016/S0965-9773(99)00398-0","DOIUrl":"https://doi.org/10.1016/S0965-9773(99)00398-0","url":null,"abstract":"<div>Pure amorphous SiO2 powder with nanometer size particles was exposed to various heat treatments up to 1200°C. The microstructure, particle size, dielectric constant and electrical resistivity of the powder were characterized after each heat treatment. It was found that the dielectric constant of the powder is higher compared to that of amorphous SiO2 thin films. This enhancement is correlated with higher density of Si dangling bonds, which contribute to the polarization of the material. A major decrease in the dielectric constant takes place during heating up to 600°C where neither growth nor crystallization of the particles occur but only pronounced reduction in the density of the Si dangling bonds is observed. Pronounced growth and initial crystallization to a cristobalite phase of the powder particles occur at about 1100°C and have a minor effect on the dielectric constant. The Si dangling bonds also serve as electrical conducting centers in the powder and their annihilation due to the heat treatments is well observed as an increase in the electrical resistivity of the powder.</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)00398-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90034447","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: 24

Index 指数

Nanostructured Materials Pub Date : 1999-11-01 DOI: 10.1016/S0965-9773(00)00434-7

引用次数: 0