Pyrochlore-Rich Synroc as a Host for Immobilization of Actinides

2000 ◽  
Vol 663 ◽  
Author(s):  
Jianwen Yang ◽  
Baolong Tang ◽  
Shanggeng Luo
Keyword(s):  
Electron Microscopy ◽  
Energy Dispersive Spectrometer ◽  
Phase Identification ◽  
X Ray ◽  
Durability Properties ◽  
Waste Forms ◽  
Icp Ms ◽  
Electron Image ◽  
Backscattered Electron ◽  
Scanning Electron

ABSTRACTSix different formulations of pyrochlore-rich synroc waste forms were designed to contain 32-50wt% simulated actinides. Their physical properties were determined. Phase identification was carried out by using X-ray diffractometer (XRD), and backscattered electron image (BEI) in scanning electron microscopy (SEM). Phase microanalyses were carried out using energy dispersive spectrometer (EDS) in SEM. Their durability properties were determined by PCT leach tests, the leachate was analyzed by using inductive coupled plasma mass spectroscopy (ICP/MS) and atomic absorption spectroscopy (AAS).

Composition and Microstructure of a Natural Nano-Structure Mineral: Six-Ring Rock

2011 ◽  
Vol 295-297 ◽  
pp. 869-872
Author(s):  
Qing Shan Li ◽  
Xin Wang ◽  
Jun Liu ◽  
Guang Zhong Xing
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Energy Dispersive Spectrometer ◽  
The Body ◽  
X Ray Diffraction ◽  
Nano Structure ◽  
X Ray ◽  
Transmission Electron ◽  
Nano Size ◽  
Scanning Electron

Six-ring Rock is widely used as containers of water and additives to produce health care products. In this paper, the composition and microstructure of Six-ring Rock have been investigated by using scanning electron microscopy, energy dispersive spectrometer, transmission electron microscopy, x-ray diffraction and other technologies. Results show that Six-ring Rock is composed of CaMg(CO3)2, SiO2 and KAlSi3O8. Fe atoms exist in CaMg(CO3)2 by replacing Mg atoms. Six-ring Rock shows nano-size lamellar and acerose microstructures on the surface, and nano-size monocrystals in the body. Six-ring Rock is a natural nano structure mineral.

scholarly journals Calcium Detection in Secretion Granules of Avian Oviduct by Scanning Electron Microscopy (SEM) and Energy-dispersive X-Ray Microanalysis (EDX)

1983 ◽  
Vol 31 (1A_suppl) ◽  
pp. 219-221 ◽  
Author(s):  
Takashi Makita ◽  
Masanori Hatsuoka ◽  
Yukiko Sugi
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Energy Dispersive ◽  
Shell Gland ◽  
Wide Angle ◽  
X Ray ◽  
Secretion Granules ◽  
Backscattered Electron ◽  
Calcium Detection ◽  
Scanning Electron

Secretion granules in the shell gland, isthmus, and albumin-secreting region of the hen oviduct were analyzed with WET-scanning electron microscopy (SEM) and EDX, a combination of wide-angle backscattered electron detector (BED) and energy-dispersive X-ray microanalyzer (EDX). Glutaraldehyde-fixed but unhydrated, unstained, and uncoated samples were analyzed; Ca was localized in all secretion granules in all three sections of the hen oviduct studied.

Preparation of Cerium Oxide Tubes with Wool Fibers as Template

2015 ◽  
Vol 671 ◽  
pp. 248-254
Author(s):  
Jia Li Gu ◽  
Li Jiang Lu ◽  
Song Liu ◽  
Min Shao ◽  
Guo Qing Zhang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Cerium Oxide ◽  
Vapor Deposition ◽  
Energy Dispersive Spectrometer ◽  
Deposition Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Thermogravimetric Analyzer ◽  
Wool Fibers ◽  
Scanning Electron

Using wool fibers as template and Ce (NO3)3•6H2O, PEG and NH3·H2O as precursors, micron-scale CeO2tubes composed of well-crystalline CeO2nanoparticles have been synthesized. Cerium oxide was first precipitated on the wool fibers by vapor deposition method, then the fibers were removed by a two-step calcination. The obtained products were characterized by scanning electron microscopy (SEM), thermogravimetric Analyzer (TGA), powder X-ray diffraction (XRD) and energy dispersive spectrometer (EDS). The results show that intact tubes with a diameter of 8~12μm have been successfully prepared.

Effect of Nd Addition on Microstructure of Mg-Zn-Nd Master Alloys

2012 ◽  
Vol 500 ◽  
pp. 646-650 ◽  
Author(s):  
Zhen Wei Zhao ◽  
Xin Ying Teng ◽  
Guo Rong Zhou
Keyword(s):  
Electron Microscopy ◽  
Growth Process ◽  
Energy Dispersive Spectrometer ◽  
X Ray Diffraction ◽  
Growth Morphology ◽  
X Ray ◽  
Nd Addition ◽  
Master Alloys ◽  
The Matrix ◽  
Scanning Electron

Mg-Zn-Nd master alloys containing spherical quasicrystal phase were prepared under conventional casting conditions. The microstructures and phases of Mg-Zn-Nd ternary alloy have been investigated by means of scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy dispersive spectrometer (EDS). The results show that the microstructure of Mg-Zn-Nd master alloys has been changed significantly with the addition of Nd. When adding 5wt% Nd, it is clear that a lot of spherical I-phase with high roundness and size below 10μm distributed evenly in the matrix. With the increase of Nd, the number of spherical I-phases is reduced and rod-like phases increased. The growth process and the final growth morphology of quasicrystal phase are restricted by the element Nd, thus the growth rates of all quasicrystal growth surfaces tend to be consistent, which contributes to the formation of spherical quasicrystal phase.

The effect of fluid composition on the mechanism of the aragonite to calcite transition

2008 ◽  
Vol 72 (1) ◽  
pp. 111-114 ◽  
Author(s):  
C. Perdikouri ◽  
A. Kasioptas ◽  
C. V. Putnis ◽  
A. Putnis
Keyword(s):  
Electron Microscopy ◽  
Mass Spectrometry ◽  
Fluid Composition ◽  
Hydrothermal Conditions ◽  
Precipitation Mechanism ◽  
X Ray ◽  
Inductively Coupled ◽  
Inductively Coupled Mass Spectrometry ◽  
Icp Ms ◽  
Scanning Electron

AbstractExperiments were performed to investigate the transformation of natural aragonite crystals to calcite by reaction with aqueous solutions of calcium carbonate at hydrothermal conditions for different periods of time. X-ray powder diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy and Laser ablation inductively coupled mass spectrometry (LA-ICP-MS) were used to characterize the reaction product. The results indicate that the replacement of aragonite by calcite follows an interface-coupled dissolution-precipitation mechanism.

Thin-film reactions of Al with Co, Cr, Mo, Ta, Ti, and W

1989 ◽  
Vol 4 (4) ◽  
pp. 815-820 ◽  
Author(s):  
E. G. Colgan ◽  
J. W. Mayer
Keyword(s):  
Thin Film ◽  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Phase Diagrams ◽  
Refractory Metals ◽  
Rutherford Backscattering ◽  
Phase Identification ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

The thin-film interactions of Al with refractory metals (Co, Cr, Mo, Ta, Ti, and W) have been investigated. The composition and thickness of the reacted aluminide layers were determined by Rutherford backscattering and phase identification was made by x-ray diffraction. Scanning electron microscopy was used to examine the lateral uniformity. The initial aluminide phases to grow are the Al-rich phases: Co2Al9, Cr2Al13, MoAl12, TaAl3, TiAl3, and WAI12. These are the most Al-rich phases on the phase diagrams. The reaction temperatures varied between 350 and 525 °C.

Low Temperature Oxidation Behaviors of CNTs/MoSi2 Composites

2014 ◽  
Vol 983 ◽  
pp. 116-120
Author(s):  
Houan Zhang ◽  
He Jian Wu ◽  
Jia Lin ◽  
Si Yong Gu ◽  
Lei Yu
Keyword(s):  
Electron Microscopy ◽  
Molybdenum Disilicide ◽  
Phase Identification ◽  
Matrix Composites ◽  
X Ray Diffraction ◽  
Low Temperature Oxidation ◽  
Temperature Oxidation ◽  
X Ray ◽  
Scanning Electron ◽  
Oxidation Behaviors

Molybdenum disilicide (MoSi2) matrix composites with various contents of carbon nanotubes (CNTs) were fabricated by sintering in vacuum at 1550 °C for 1 h. The oxidation behaviors of CNTs/MoSi2composites at 400 °C and 500 °C for 200 h in air were studied. Results showed that the weight loss of CNTs/MoSi2composites increased with the increase of CNTs content. “Pest” phenomenon happened at 400 °C but not at 500 °C. Phase identification and microstructure of the samples were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). It was found that many MoO3whiskers and microcracks only occurred on the surface of CNTs/MoSi2composites when oxidized at 400 °C in air, which leaded to the catastrophic disintegration of CNTs/MoSi2composites.

scholarly journals Influence of phase distribution of converter slag microzones on the occurrence of P

2021 ◽  
Vol 40 (1) ◽  
pp. 40-44
Author(s):  
Chenxiao Li ◽  
Shuai Tong ◽  
Yuekai Xue ◽  
Shuhuan Wang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Energy Spectrum ◽  
Activity Coefficient ◽  
Phase Distribution ◽  
Converter Slag ◽  
Element Distribution ◽  
X Ray ◽  
Backscattered Electron ◽  
Scanning Electron

Abstract The phase and element distribution of converter slag was analyzed with the backscattered electron (BSE) images of scanning electron microscopy and X-ray energy spectrum. The results show that the Ca and Si are attached in the slag micro-area, while the Fe is present in areas with less Ca and Si. Most of the P appear in areas with more Ca and Si. The content of SiO2 tends to increase with an increase in the CaO content in the slag micro-area. The activity of a CaO increases with an increase in the CaO content in the slag micro-area, while the activity of a FeO increases first and then decreases. In the slag micro-area with an increase in the FeO content, both the mole fraction and the activity coefficient of SiO2 decrease; so, the content of SiO2 decreases gradually.

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