HREM and Image Simulation of Short-Range-Order Domains in Ion Irradiated Zirconolite

2000 ◽  
Vol 6 (S2) ◽  
pp. 392-393
Author(s):  
S. X. Wang ◽  
L. M. Wang ◽  
R. C. Ewing
Keyword(s):  
High Temperature ◽  
Critical Temperature ◽  
Temperature Dependence ◽  
Short Range ◽  
Radiation Effects ◽  
Short Range Order ◽  
Fluorite Structure ◽  
Range Order ◽  
Image Simulation ◽  
Ion Species

Zirconolite (CaZrTi2O7) is an important phase proposed for immobilization of plutonium. Radiation effects in zirconolite were studied by 1 MeV Kr+ and 1.5 MeV Xe+ irradiation at various temperatures. Zirconolite became amorphous at temperatures below a critical temperature, Tc. The critical temperature was found to be a function of ion species: Tc - 654 K for 1 MeV Kr+ and 710 K for 1.5 MeV Xe+. The temperature dependence of amorphization dose is shown in FIG. 1. Above Tc, the specimen remained crystalline after prolonged irradiation (up to 3.6×l015 ions/cm2). However, the high-temperature irradiated zirconolite was transformed into the fluorite structure (as shown by the strong diffraction maxima in FIG. 2). In addition to the maxima from the fluorite structure, strong diffuse maxima were observed surrounding the Bragg position of pyrochlore superlattice (FIG. 2).

Temperature dependence of short-range-order parameters

1978 ◽  
Vol 21 (4) ◽  
pp. 454-458
Author(s):  
G. P. Revkevich ◽  
E. I. Bodneva
Keyword(s):  
Temperature Dependence ◽  
Short Range ◽  
Short Range Order ◽  
Order Parameters ◽  
Range Order

scholarly journals Mathematical model of high-temperature melt flow with account for short-range order nature

2019 ◽  
Vol 94 (2) ◽  
pp. 22-28
Author(s):  
S.N. Shaltakov ◽  
◽  
S.Sh. Kazhikenova ◽  
B.R. Nussupbekov ◽  
D.Zh. Karabekova ◽  
...  
Keyword(s):  
Mathematical Model ◽  
High Temperature ◽  
Short Range ◽  
Short Range Order ◽  
Range Order ◽  
Melt Flow

scholarly journals Temperature dependence of the short-range order of Cu65Zr35 metallic glass

2013 ◽  
Vol 32 ◽  
pp. 51-56 ◽  
Author(s):  
N. Mattern ◽  
J. Bednarcik ◽  
M. Stoica ◽  
J. Eckert
Keyword(s):  
Metallic Glass ◽  
Temperature Dependence ◽  
Short Range ◽  
Short Range Order ◽  
Range Order

Order-disorder phenomena in α -brass I. Development of order

1960 ◽  
Vol 257 (1290) ◽  
pp. 326-337 ◽  
Keyword(s):  
Electrical Resistivity ◽  
Critical Temperature ◽  
Long Range ◽  
Short Range ◽  
Short Range Order ◽  
Isothermal Annealing ◽  
Range Order ◽  
Long Range Order ◽  
Rapid Rate ◽  
Resistivity Measurements

An absorption of energy of 0⋅40 cal/g is observed in the range of temperature 180 to 245 °C on heating a slowly cooled specimen of α -brass at 2 °C/min. This absorption of energy increases markedly on isothermal annealing at temperatures below 190 °C; the maximum absorption being 0⋅86 cal/g. The absorption of energy is correlated with changes in electrical resistivity and the results of the energy and resistivity measurements are attributed to the destruction of order. The experimental observations may be explained by the destruction of long-range order with a critical temperature of 245 °C or by the destruction of short-range order at a more rapid rate below 245 °C than above.

Radiation Effects in Murataite Ceramics

2003 ◽  
Vol 807 ◽  
Author(s):  
J. Lian ◽  
L. M. Wang ◽  
R. C. Ewing ◽  
S. V. Yudintsev ◽  
S. V. Stefanovsky
Keyword(s):  
Rare Earth ◽  
Critical Temperature ◽  
Rare Earth Elements ◽  
Temperature Dependence ◽  
Radiation Effects ◽  
Ion Irradiation ◽  
Ion Beam ◽  
Structural Disorder ◽  
Fluorite Structure ◽  
Potential Host

ABSTRACTSynthetic murataite, an isometric, derivative of the fluorite-structure, has been proposed as a potential host phase for the immobilization of rare earth elements (REE) and actinides. A 1 MeV Kr+ ion irradiation has been performed on synthetic murataite ceramics in the system Ca-Ti-U-Mn-Al-Zr-Ce-O for different structural multiples of the fluorite unit cell. The temperature dependence of the amorphization dose has been determined. A higher critical temperature was obtained for the disordered murataite as compared to that of murataite superstructures, suggesting that murataite becomes more “resistant” to ion beam-induced damage with increasing degrees of structural disorder.

Determination of Short Range Order Parameters in 62Ni0.765Fe0.235 At 600°C Effect of a Quench

1982 ◽  
Vol 21 ◽  
Author(s):  
S. Lefebvre ◽  
F. Bley ◽  
P. Cenedese
Keyword(s):  
High Temperature ◽  
Long Range ◽  
Short Range ◽  
Room Temperature ◽  
Short Range Order ◽  
Range Order ◽  
Local Order ◽  
Long Range Order ◽  
Pair Potentials

ABSTRACTDifferent states of local order have been previously measured at room temperature on water quenched crystal of Ni0.76562 Fe0.235 [1−2]. The Cowley' parameters and the interaction pair potentials in a Clapp and floss approximation have been determined at : 385° C, 470°C, 507°C, 535°C, 685°C that is under and above Tc which is equal to 500°C for this composition.The kinetic of long range order establishment is, in this alloy, very sluggish even near Tc [3]; the kinetic of short range order (SRO) is completely different and may be more complex [4]. In the previous experiments it has been supposed that the state of high temperature was retained during the quench. The following experiments check this hypothesis.

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