Low symmetry aspects inherent in electron magnetic resonance (EMR) data for transition ions at triclinic and monoclinic symmetry sites: EMR of Fe3+ and Gd3+ in monoclinic zirconia revisited

2008 ◽  
Vol 403 (13-16) ◽  
pp. 2349-2366 ◽  
Author(s):  
Czesław Rudowicz ◽  
Paweł Gnutek
Keyword(s):  
Magnetic Resonance ◽  
Electron Magnetic Resonance ◽  
Monoclinic Zirconia ◽  
Monoclinic Symmetry ◽  
Low Symmetry

Electron Magnetic Resonance Studies on Nanowire and Nanoparticle Arrays

2009 ◽  
Vol 1228 ◽  
Author(s):  
Osei K Amponsah ◽  
Rakhim R. Rakhimov ◽  
Yuri A. Barnakov ◽  
Rosa A Lukaszew ◽  
Jeffrey C Owrutsky ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Magnetic Resonance ◽  
Electron Magnetic Resonance ◽  
Superparamagnetic Nanoparticles ◽  
Magnetic Nanowires ◽  
Nanoparticle Arrays ◽  
Alumina Membrane ◽  
Magnetic Resonance Studies ◽  
Magnetic Inclusions

AbstractArrays of magnetic nanowires and well-oriented chains of superparamagnetic nanoparticles were fabricated using polymer and alumina membrane templates. The systems were characterized by SQUID and studied by electron magnetic resonance methods. Comparative analysis of the obtained results for different geometries and sizes of the magnetic inclusions is presented.

Indexing of powder diffraction patterns for low-symmetry lattices by the successive dichotomy method

1991 ◽  
Vol 24 (6) ◽  
pp. 987-993 ◽  
Author(s):  
A. Boultif ◽  
D. Louër
Keyword(s):  
Success Rate ◽  
Powder Diffraction ◽  
Input Parameter ◽  
Mathematical Treatment ◽  
Monoclinic Symmetry ◽  
Unit Cells ◽  
Rate Calculation ◽  
Diffraction Patterns ◽  
Low Symmetry ◽  
Very High

The dichotomy method for indexing powder diffraction patterns for low-symmetry lattices is studied in terms of an optimization of bound relations used in the comparison of observed data with the calculated patterns generated at each level of the analysis. A rigorous mathematical treatment is presented for monoclinic and triclinic cases. A new program, DICVOL91, has been written, working from the cubic end of the symmetry sequence to triclinic lattices. The search of unit cells is exhaustive within input parameter limits, although a few restrictions for the hkl indices of the first two diffraction lines have been introduced in the study of triclinic symmetry. The efficiency of the method has been checked by means of a large number of accurate powder data, with a very high success rate. Calculation times appeared to be quite reasonable for the majority of examples, down to monoclinic symmetry, but were less predictable for triclinic cases. Applications to all symmetries, including cases with a dominant zone, are discussed.

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