OBSERVATION OF A SILANIMINE IN AN INERT MATRIX AND IN SOLUTION AT LOW TEMPERATURE

1986 ◽  
Vol 15 (6) ◽  
pp. 1025-1028 ◽  
Author(s):  
Steven S. Zigler ◽  
Robert West ◽  
Josef Michl
Keyword(s):  
Low Temperature ◽  
Inert Matrix

Mechanical properties and XRD studies of silicon carbide inert matrix fuel fabricated by a low temperature polymer precursor route

2013 ◽  
Vol 432 (1-3) ◽  
pp. 152-159 ◽  
Author(s):  
Chunghao Shih ◽  
Nadia Rohbeck ◽  
Karthik Gopalakrishnan ◽  
James S. Tulenko ◽  
Ronald H. Baney
Keyword(s):  
Mechanical Properties ◽  
Silicon Carbide ◽  
Low Temperature ◽  
Polymer Precursor ◽  
Inert Matrix Fuel ◽  
Inert Matrix ◽  
Precursor Route ◽  
Xrd Studies

Low Temperature Sintering of Si3N4 Ceramics and its Applicability as an Inert Matrix of the Transuranium Elements for Transmutation of Minor Actinides

2008 ◽  
Vol 403 ◽  
pp. 23-26 ◽  
Author(s):  
Toyohiko Yano ◽  
Junichi Yamane ◽  
Katsumi Yoshida
Keyword(s):  
Low Temperature ◽  
Neutron Irradiation ◽  
Sintering Behavior ◽  
Minor Actinides ◽  
Pressureless Sintering ◽  
Transuranium Element ◽  
Nuclear Fuels ◽  
Inert Matrix ◽  
Nitride Ceramics ◽  
Si3n4 Ceramics

For the transmutation of the very long half-lived isotopes which are separated from the spent nuclear fuels, it is necessary to find proper inert matrices these are stable under heavy neutron irradiation at high temperature. Silicon nitride ceramics is a candidate since it is very tolerant for heavy neutron irradiation and keeps relatively high thermal conductivity. For these reasons, we try to sinter Si3N4 ceramics containing large amounts of CeO2 as a simulant for Am2O3, a typical transuranium element. The low-temperature pressureless-sintering behavior of the ceramics and chemical and thermal properties of the obtained sintered bodies are reported.

Low Temperature Synthesis of Silicon Carbide Inert Matrix Fuel (IMF)

2009 ◽  
Vol 1215 ◽  
Author(s):  
Chunghao Shih ◽  
James Tulenko ◽  
Ronald Baney
Keyword(s):  
Silicon Carbide ◽  
Low Temperature ◽  
Mercury Porosimetry ◽  
Theoretical Density ◽  
Pressing Pressure ◽  
Green Body ◽  
Sem Images ◽  
Inert Matrix ◽  
Liquid Polymer ◽  
Sic Particles

AbstractA process for the synthesis of silicon carbide (SiC) inert matrix fuels at a low temperature (1050 °C) is reported which utilized a liquid polymer precursor. As the polymer content increased, the theoretical density of the pellet at first increased and then reached a plateau. From the onset of the plateau, the packing of the one micron SiC particles in the green body was determined to be 64-68% at 600 MPa pressing pressure. As expected, mixing coarse and fine SiC particles gave a higher pellet density. The maximum density achieved was 80% of the theoretical density. Mercury porosimetry showed that the largest pore size was around 10% of the largest particle sizes present in the green body. SEM images showed that ceria, which was selected as a surrogate for PuO2 in the present study, was well distributed.

Exsolution and inversion in pigeonite from the Whin Sill, Northern England

1978 ◽  
Vol 36 (1) ◽  
pp. 474-475
Author(s):  
P.P.K. Smith
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Homogeneous Nucleation ◽  
Silicate Mineral ◽  
Antiphase Boundaries ◽  
Two Phase ◽  
Primitive Form ◽  
The Core ◽  
Nucleation Mechanisms ◽  
And Inversion

Grains of pigeonite, a calcium-poor silicate mineral of the pyroxene group, from the Whin Sill dolerite have been ion-thinned and examined by TEM. The pigeonite is strongly zoned chemically from the composition Wo8En64FS28 in the core to Wo13En34FS53 at the rim. Two phase transformations have occurred during the cooling of this pigeonite:- exsolution of augite, a more calcic pyroxene, and inversion of the pigeonite from the high- temperature C face-centred form to the low-temperature primitive form, with the formation of antiphase boundaries (APB's). Different sequences of these exsolution and inversion reactions, together with different nucleation mechanisms of the augite, have created three distinct microstructures depending on the position in the grain.In the core of the grains small platelets of augite about 0.02μm thick have farmed parallel to the (001) plane (Fig. 1). These are thought to have exsolved by homogeneous nucleation. Subsequently the inversion of the pigeonite has led to the creation of APB's.

Sign in / Sign up

Export Citation Format

Share Document