Studies on Nanostructured M50 Type Steel Using X-Ray Absorption Spectroscopy and NMR

1994 ◽  
Vol 351 ◽  
Author(s):  
Mahalingam Balasubramanian ◽  
Y.D. Zhang ◽  
J.I. Budnick ◽  
K.E. Gonsalves ◽  
T.D. Xiao
Keyword(s):  
Magnetic Properties ◽  
Long Range ◽  
Absorption Spectroscopy ◽  
Near Neighbor ◽  
Long Range Order ◽  
X Ray ◽  
Type Steel ◽  
Disordered Phase ◽  
Structural And Magnetic Properties ◽  
X Ray Absorption

ABSTRACTWe have investigated the local structural and magnetic properties of Fe in nanostructured Fe-Cr-Mo-V-C M50 type steel. Experimental techniques which we used include XAFS and NMR. NMR results on as-synthesized M50 type steel shows that the material contains a small amount of bcc Fe plus some other highly disordered phase(s). XAFS measurements indicate that the near neighbor coordinations around Fe are not simply well ordered bcc or fcc Fe and that the sample doesn't have long range crystalline order. XAFS measurements on the consolidated sample show that Fe is predominantly in the form of bcc Fe with good long range order.

Characterization of Radiation Damage at the Nb Site in Natural Pyrochlores and Samarskites by X-Ray Absorption Spectroscopy

1988 ◽  
Vol 127 ◽  
Author(s):  
R. B. Greegor ◽  
F. W. Lytle ◽  
B. C. Chakoumakos ◽  
G. R. Lumpkin ◽  
J. K. Warner ◽  
...  
Keyword(s):  
Radiation Damage ◽  
Long Range ◽  
Absorption Spectroscopy ◽  
Alpha Decay ◽  
Long Range Order ◽  
Static Disorder ◽  
Annealed Condition ◽  
X Ray ◽  
X Ray Absorption

ABSTRACTX-ray absorption spectroscopy has been used to investigate the Nb B-site in pyrochlores (A1.2B2O6Y0–1, Fd3m, Z=8) and samarskites (A3B5O16) in both metamict and annealed condition. The XANES and EXAFS measurements indicate significant changes in pyrochlore and smaller changes in samarskite as a result of radiation damage. In the metamict state the Nb site in both pyrochlores and samarskites is similar to Nb in Nb2O5. Short Nb-O (1.65Å) bonds are not disrupted by alpha-decay/recoil-nuclei events as much as longer bonds (2.00Å). This increases the asymmetry and static disorder at the local Nb site while long range order is greatly diminished resulting in considerable distribution in Nb-M distances and bond angles.

Investigation of Structural and Magnetic Properties of CoPt/CoAu Bimetallic Nanochains by X-ray Absorption Spectroscopy

2013 ◽  
Vol 117 (13) ◽  
pp. 6872-6879 ◽  
Author(s):  
Wei-Feng Huang ◽  
Qian Zhang ◽  
Dong-Feng Zhang ◽  
Jing Zhou ◽  
Cheng Si ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Absorption Spectroscopy ◽  
X Ray ◽  
Structural And Magnetic Properties ◽  
X Ray Absorption
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