Neutron Diffraction Study of Radiation Damage in U3Si at 30°C and 350°C

1994 ◽  
Vol 373 ◽  
Author(s):  
R. C. Birtcher ◽  
J. W. Richardson ◽  
M. H. Mueller
Keyword(s):  
Neutron Diffraction ◽  
Neutron Irradiation ◽  
Damage Evolution ◽  
Irradiation Dose ◽  
Lattice Strain ◽  
Critical Level ◽  
Neutron Diffraction Study ◽  
Loop Formation ◽  
Temperature Lattice ◽  
Higher Temperature

AbstractWe compare damage evolution in U3Si produced by neutron irradiation at 30°C and 350°C and measured by neutron diffraction. Initial studies found that increasing neutron irradiation dose at 30°C results in monotonic expansion of the a-axis and contraction of the c-axis that transforms the crystal structure from tetragonal to cubic [1]. Additional irradiation results in amorphization. Neutron irradiation at 350°C results in little change to the a-axis and expansion of the caxis.The complete alteration in lattice dilatation during irradiation is interpreted as due to modification of surviving defect configurations at the higher temperature. The high temperature lattice dilations can be explained by defect loop formation in the a-b plane. Confinement of lattice strain to the c-axis during irradiation at 350°C may be the mechanism that prevents the total lattice dilatation from exceeding the critical level required for amorphization.

Neutron Diffraction Study on Intermetallic Er5Mg24 and Tm5Mg24

2004 ◽  
Vol 443-444 ◽  
pp. 263-266 ◽  
Author(s):  
Wolfgang Schäfer ◽  
K.H.J. Buschow
Keyword(s):  
Neutron Diffraction ◽  
Powder Diffraction ◽  
Room Temperature ◽  
Neutron Diffraction Study ◽  
Neutron Powder Diffraction ◽  
Magnetic Exchange ◽  
Lattice Constants ◽  
Group I ◽  
Temperature Lattice ◽  
Curie Temperatures

Neutron powder diffraction on the binary intermetallics Er5Mg24 and Tm5Mg24 confirms their isostructural and pure crystallization in the Ti5Re24-type structure (space group I 4 3m, Z = 2)with rare earths located in 2a(0,0,0) and 8c(x,x,x) and Mg in two different 24g(x,y,x) sites. Room temperature lattice constants are 11.263(2) Å and 11.215(1) Å for the Er and Tm compound, respectively. Atomic positions have been refined. Both compounds order ferromagnetically below Curie temperatures of 17.5(5) K and 7.5(5) K for Er5Mg24 and Tm5Mg24, respectively. The magnitudes of the Er moments at 4.2 K are 7.5(2) µB and 4.4(2)µB on the 2a and the 8c sites, respectively. The Tm moments which have been refined from 2 K measurements amount to 3.0(3)µB and 2.8(2) µB, respectively. The temperature dependencies of the magnetic Bragg intensities reveal distinct deviations from Brillouin curves for J = 15/2 (Er) and J = 6 (Tm) systems and indicate a complex magnetic exchange.

Neutron Diffraction Study of Extruded Magnesium during Cyclic and Elevated Temperature Loading

2005 ◽  
Vol 490-491 ◽  
pp. 257-262 ◽  
Author(s):  
E.C. Oliver ◽  
Mark R. Daymond ◽  
Philip J. Withers
Keyword(s):  
Neutron Diffraction ◽  
Bauschinger Effect ◽  
Compressive Loading ◽  
Tensile Loading ◽  
Neutron Diffraction Study ◽  
Intergranular Strain ◽  
Tension And Compression ◽  
Two Temperatures ◽  
Higher Temperature ◽  
Compressive Tests

Neutron diffraction has been used to study the progress of deformation twinning and intergranular strain evolution in extruded magnesium during cyclic and monotonic loading at two temperatures. Differences in the intergranular strains generated during tensile and compressive tests are attributed to the operation of twinning in compression. Twinning activity is reduced relative to slip at higher temperature, leading to greater similarities between tension and compression. During cyclic loading, a distinct Bauschinger effect is observed after each compressive loading stage. The origin of this effect is identified as the reversal of twinning during unloading and subsequent tensile loading.

Neutron diffraction study of nickel zirconium hydride

1964 ◽  
Vol 25 (5) ◽  
pp. 451-453 ◽  
Author(s):  
S.W. Peterson ◽  
V.N. Sadana ◽  
W.L. Korst
Keyword(s):  
Neutron Diffraction ◽  
Diffraction Study ◽  
Neutron Diffraction Study ◽  
Zirconium Hydride

A NEUTRON DIFFRACTION STUDY OF CuSeO4

1971 ◽  
Vol 32 (C1) ◽  
pp. C1-855-C1-856 ◽  
Author(s):  
W. SCHARENBERG ◽  
G. WILL
Keyword(s):  
Neutron Diffraction ◽  
Diffraction Study ◽  
Neutron Diffraction Study

NEUTRON DIFFRACTION STUDY OF ErFe2

1971 ◽  
Vol 32 (C1) ◽  
pp. C1-675-C1-676 ◽  
Author(s):  
M. O. BARGOUTH ◽  
G. WILL
Keyword(s):  
Neutron Diffraction ◽  
Diffraction Study ◽  
Neutron Diffraction Study

NEUTRON DIFFRACTION STUDY OF THE Ho-Fe SYSTEM

1971 ◽  
Vol 32 (C1) ◽  
pp. C1-670-C1-671 ◽  
Author(s):  
J. M. MOREAU ◽  
C. MICHEL ◽  
M. SIMMONS ◽  
T. J. O'KEEFE ◽  
W. J. JAMES
Keyword(s):  
Neutron Diffraction ◽  
Diffraction Study ◽  
Neutron Diffraction Study
Sign in / Sign up

Export Citation Format

Share Document