In Situ Tem Study of Amorphous to Crystalline Transformation in R-Fe-B Ribbons

Building Blocks ◽

In Situ Tem ◽

Local Unit ◽

X Ray Diffraction ◽

X Ray ◽

Unit Structure ◽

ABSTRACTThe amorphous-crystalline transformation in R-Fe-B ribbons was studied in situ in a transmission electron microscope (TEM) and with X-ray diffraction. Metastable phases of α-Fe(R) and Fe3B were found to form during crystallization before the final R2Fe14B phase is formed. The Fe3B phase is believed to be important for the formation of the 2:14:1 phase because its “local unit structure” is one of the basic building blocks in the 2:14:1 unit cell.

Luminescent Properties of Gd2MoO6:Eu3+ Nanophosphor for WLEDs

Dalton Transactions ◽

10.1039/d1dt00547b ◽

2021 ◽

Author(s):

Yan Chen ◽

Yuemei Lan ◽

Dong Wang ◽

Guoxing Zhang ◽

Wenlong Peng ◽

...

Keyword(s):

Electron Microscope ◽

Fluorescence Spectra ◽

Solvothermal Method ◽

Luminescent Properties ◽

X Ray Diffraction ◽

X Ray ◽

A series of Gd2-xMoO6:xEu3+(x=0.18-0.38) nanophosphors were synthesized by the solvothermal method. The properties of this nanophosphor were characterized by x-ray diffraction (XRD), transmission electron microscope (TEM), fluorescence spectra and diffuse...

Formation of Graphite Encapsulated Nickel Nanoparticles by Ball Milling and Annealing of Expanded Graphite with Nickel

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.80-81.217 ◽

2011 ◽

Vol 80-81 ◽

pp. 217-220 ◽

Cited By ~ 2

Author(s):

Xue Qing Yue ◽

Hai Jun Fu ◽

Da Jun Li

Keyword(s):

Electron Microscope ◽

Ball Milling ◽

Nickel Nanoparticles ◽

Size Range ◽

Expanded Graphite ◽

X Ray Diffraction ◽

X Ray ◽

Nickel Powders ◽

Graphite encapsulated nickel nanoparticles were prepared by ball milling andsubsequently annealing a mixture of expanded graphite with nickel powders. The products were characterized by transmission electron microscope and X-ray diffraction. The formation mechanism of the products was discussed. Results show that the products have a size range of 20-150 nm. The graphite and nickel in the products all exhibit a high crystallinity.

Template Induced Synthesis of Nano-Hydroxyapatite by Co-Precipitation Method

10.4028/www.scientific.net/amr.311-313.1713 ◽

2011 ◽

Vol 311-313 ◽

pp. 1713-1716 ◽

Cited By ~ 1

Author(s):

Yan Rong Sun ◽

Tao Fan ◽

Chang An Wang ◽

Li Guo Ma ◽

Feng Liu

Keyword(s):

Electron Microscope ◽

Chondroitin Sulfate ◽

Aspartic Acid ◽

Precipitation Method ◽

X Ray Diffraction ◽

X Ray ◽

Structure And Morphology ◽

Transmission Electron ◽

Co Precipitation

Nano-hydroxyapatite with different morphology was synthesized by the co-precipitation method coupled with biomineralization using Ca(NO3)2•4H2O and (NH4)2HPO4 as reagents, adding chondroitin sulfate, agarose and aspartic acid as template. The structure and morphology of the prepared powders were characterized by X-ray diffraction (XRD) and transmission electron microscope (TEM).

Effect of Preheating Temperature on Synthesis of Pure BiFeO3 via Sol–Gel Method

Nanopages ◽

10.1556/566.2017.0010 ◽

2019 ◽

pp. 1-11

Author(s):

G. M. Taha ◽

M. N. Rashed ◽

M. S. El-Sadek ◽

M. A. Moghazy

Keyword(s):

Electron Microscope ◽

Sol Gel ◽

X Ray Diffraction ◽

Pure Bifeo3 ◽

Gel Method ◽

X Ray ◽

Sol Gel Method ◽

Transmission Electron ◽

Preheating Temperature

Abstract BiFeO3 (BFO) nanopowder was synthesized in a pure form via a sol- gel method based on glycol gel reaction. Effect of drying and preheating temperature on preventing other phases was studied. Many parameters were studied as calcination temperature and time & stirring temperature as well. The prepared powder was characterized by X-Ray Diffraction of powder (XRD) and Transmission Electron Microscope (TEM). High pure BiFeO3 was obtained by preheated process at 400 °C for 0.5 h and calcination at 600 °C for 0.5 h without any impurities compared to dry at110 °C.

Research on Purification of Attapulgite Clay and Adsorption Characteristics for Metal Cations

10.4028/www.scientific.net/amr.79-82.1719 ◽

2009 ◽

Vol 79-82 ◽

pp. 1719-1722

Author(s):

Zhi Hong Zhang ◽

Shao Yu Zhang ◽

Xue Dong Liu

Keyword(s):

Electron Microscope ◽

Hydrochloric Acid ◽

Adsorption Capacity ◽

Metal Cations ◽

Fiber Structure ◽

X Ray Diffraction ◽

X Ray ◽

Transmission Electron ◽

Attapulgite Clay

Attapulgite clay(ATP) from Xuyi county of China was purified by a wet method then treated with NaOH and 1.0 mol/L, 2.0 mol/L and 3.0 mol/L solutions of HCl. Transmission electron microscope(TEM) and X-ray diffraction (XRD) were used to characterize treated ATP. Results showed that wet purification could remove most of impurities. Treatment by alkaline and HCl of 1.0 mol/L and 2.0 mol/L could increase purity while treatment of 3.0 mol/L hydrochloric acid could dissolve some element of ATP so much as form SiO2 and destroy fiber structure to clips. Adsorption experiments of Fe3+ and Ni2+ from aqueous solutions were done using original ATP, purified ATP and treated ATP as absorbents. Results showed that Attapulgite could adsorb metal cations in significant amounts. Sodium hydroxide activation had little influence on adsorption capacity. Influences of acid treatments to ATP on adsorption capacity varied on different concentration solutions.

Relationship Between Microstructure and Hardness of ZrN/TiN Multi-Layers with Various Bilayer Thicknesses

Advances in Science and Technology ◽

10.4028/www.scientific.net/ast.63.392 ◽

2010 ◽

Vol 63 ◽

pp. 392-395

Author(s):

Yoshifumi Aoi ◽

Satoru Furuhata ◽

Hiromi Nakano

Keyword(s):

Mechanical Property ◽

Electron Microscope ◽

Microstructure And Mechanical Property

Ion Beam ◽

Ion Beam Sputtering ◽

X Ray Diffraction ◽

X Ray ◽

Transmission Electron ◽

Beam Sputtering ◽

ZrN/TiN multi-layers were synthesized by ion beam sputtering technique. Microstructure and mechanical property of the ZrN/TiN multi-layers were characterized and the relationships between microstructure and hardness of the ZrN/TiN multi-layers with various bilayer thicknesses and thickness ratios were investigated. The microstructure of multi-layers have been investigated using transmission electron microscope (TEM) and X-ray diffraction (XRD).

ZnFe2O4 Modified by Fe(NO3)3 for the Synthesis of Ionic Ferrofluids

10.4028/www.scientific.net/amr.177.32 ◽

2010 ◽

Vol 177 ◽

pp. 32-36 ◽

Cited By ~ 1

Author(s):

An Rong Wang ◽

Jian Li ◽

Qing Mei Zhang ◽

Hua Miao

Keyword(s):

Particle Size ◽

Magnetic Properties ◽

Electron Microscope ◽

Photoelectron Spectroscopy ◽

Vibrating Sample Magnetometer ◽

X Ray Diffraction ◽

X Ray ◽

Transmission Electron ◽

Znfe2o4 Nanoparticles

Weak magnetic ZnFe2O4 nanoparticles were prepared by coprecipitation and treated with different concentrations of Fe(NO3)3 solution. Untreated and treated particles were studied using a vibrating sample magnetometer, transmission electron microscope, by X-ray diffraction, X-ray energy dispersive spectroscopy and X photoelectron spectroscopy. The results showed that, after treatment, the ZnFe2O4/γ-Fe2O3 forms disphase nanoparticles, with enlarged size, enhanced magnetic properties and with a surface parceled with Fe(NO3)3. The size of the particles and their magnetic properties are related to the concentration of the treatment solution. The particle size and magnetic properties could be controlled by controlling the concentration of treating solution, therefore nanoparticles can be more widely used.

Formation of ultrafine powders of binary alloy systems by plasma jet

Journal of Materials Research ◽

10.1557/jmr.1998.0210 ◽

1998 ◽

Vol 13 (6) ◽

pp. 1511-1516 ◽

Cited By ~ 3

Author(s):

M. Umemoto ◽

M. Udaka ◽

K. Kawasaki ◽

X. D. Liu

Keyword(s):

Electron Microscope ◽

Binary Alloy ◽

Ultrafine Particles ◽

Plasma Jet ◽

New Method ◽

Ultrafine Powders ◽

X Ray Diffraction ◽

X Ray ◽

Recently, a new method, i.e., a plasma jet method, was developed in our lab for the production of ultrafine powders. In the present work, we investigated the formation of binary Al–Fe, Al–Si, Fe–Si, Al–Cu, Al–Ni, Ni–Ti, Fe–Cu, and Fe–Ti ultrafine powders using this method. Premixed pure elemental powders of various compositions of Al–Fe, Al–Si, Fe–Si, Al–Cu, Al–Ni, Ni–Ti, Fe–Cu, and Fe–Ti were used as starting materials. These premixed powders were injected into the plasma jet of Ar–N2 working gas to form ultrafine powders. The obtained ultrafine powders were characterized by x-ray diffraction and transmission electron microscope to check the microstructures of ultrafine particles.

The Crystallization Research on the Zr-Based Bulk Metallic Glasses by Ion Thinning

10.4028/www.scientific.net/amr.887-888.116 ◽

2014 ◽

Vol 887-888 ◽

pp. 116-120

Author(s):

Ying Liang Bai ◽

Lian Long He

Keyword(s):

Electron Microscope ◽

Amorphous Alloy ◽

Metallic Glasses ◽

Bulk Amorphous Alloy ◽

Edge Region ◽

X Ray Diffraction ◽

X Ray ◽

Transmission Electron ◽

Nickel Crystals

Transmission Electron Microscope (TEM) and X-Ray Diffraction (XRD) were used to investigate crystallization of the Zr70Cu8Ti7Ni15 bulk amorphous alloy, the results show that the edge region of BMGs sample produces nanosize Nickel crystals using the method of the ion thinning to make the TEM sample. The quantity of nanocrystals is proportional to the time of ion thinning and they are not residual crystals in the BMGs.

Controlled Environment Specimen Transfer

Microscopy and Microanalysis ◽

10.1017/s1431927614000853 ◽

2014 ◽

Vol 20 (4) ◽

pp. 1038-1045 ◽

Cited By ~ 1

Author(s):

Christian D. Damsgaard ◽

Henny Zandbergen ◽

Thomas W. Hansen ◽

Ib Chorkendorff ◽

Jakob B. Wagner

Keyword(s):

Electron Microscope ◽

Elevated Temperatures ◽

Controlled Environment ◽

Ambient Atmosphere ◽

Air Exposure ◽

X Ray ◽

Environmental Transmission ◽

AbstractSpecimen transfer under controlled environment conditions, such as temperature, pressure, and gas composition, is necessary to conduct successive complementary in situ characterization of materials sensitive to ambient conditions. The in situ transfer concept is introduced by linking an environmental transmission electron microscope to an in situ X-ray diffractometer through a dedicated transmission electron microscope specimen transfer holder, capable of sealing the specimen in a gaseous environment at elevated temperatures. Two catalyst material systems have been investigated; Cu/ZnO/Al2O3 catalyst for methanol synthesis and a Co/Al2O3 catalyst for Fischer–Tropsch synthesis. Both systems are sensitive to ambient atmosphere as they will oxidize after relatively short air exposure. The Cu/ZnO/Al2O3 catalyst, was reduced in the in situ X-ray diffractometer set-up, and subsequently, successfully transferred in a reactive environment to the environmental transmission electron microscope where further analysis on the local scale were conducted. The Co/Al2O3 catalyst was reduced in the environmental microscope and successfully kept reduced outside the microscope in a reactive environment. The in situ transfer holder facilitates complimentary in situ experiments of the same specimen without changing the specimen state during transfer.