Weak ferromagnetism in the molecular compound Cu(ta)(3-pic).cntdot.H2O(ta=terephthalato,3-pic=3-picoline). Crystal structure of Cu(ta)(3-pic)2.cntdot.0.5(3-pic).cntdot.0.5CH3OH

1992 ◽  
Vol 31 (4) ◽  
pp. 625-631 ◽  
Author(s):  
Evangelos Bakalbassis ◽  
Pierre Bergerat ◽  
Olivier Kahn ◽  
Suzanne Jeannin ◽  
Yves Jeannin ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Weak Ferromagnetism ◽  
Molecular Compound

Direct correlation among crystal structure, mechanical behaviour and tabletability in a trimorphic molecular compound

CrystEngComm ◽  
2012 ◽  
Vol 14 (11) ◽  
pp. 3865 ◽  
Author(s):  
Partha Pratim Bag ◽  
Miles Chen ◽  
Changquan Calvin Sun ◽  
C. Malla Reddy
Keyword(s):  
Crystal Structure ◽  
Mechanical Behaviour ◽  
Molecular Compound

Weak Ferromagnetism in Chiral 3-Dimensional Oxalato-Bridged Cobalt(II) Compounds. Crystal Structure of [Co(bpy)3][Co2(ox)3]ClO4

1998 ◽  
Vol 37 (16) ◽  
pp. 4131-4135 ◽  
Author(s):  
María Hernández-Molina ◽  
Francesc Lloret ◽  
Catalina Ruiz-Pérez ◽  
Miguel Julve
Keyword(s):  
Crystal Structure ◽  
Weak Ferromagnetism ◽  
3 Dimensional

Correlation between Ionic Radius of Substituting Element and Magnetic Properties of Bi1-xAxFeO3-x/2 (A= Ca, Sr, Pb, Ba) Multiferroics

2009 ◽  
Vol 152-153 ◽  
pp. 131-134 ◽  
Author(s):  
V.A. Khomchenko ◽  
Michael Kopcewicz ◽  
Armandina M. Lima Lopes ◽  
Yuri G. Pogorelov ◽  
J.P. Araujo ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Spin Structure ◽  
Ionic Radius ◽  
Oxygen Vacancies ◽  
Magnetic State ◽  
Weak Ferromagnetism ◽  
Host Lattice ◽  
A Site ◽  
Spiral Spin

Investigation of crystal structure and magnetic properties of the diamagnetically- substituted Bi1-xAxFeO3-x/2 (A= Ca, Sr, Pb, Ba; x= 0.2, 0.3) polycrystalline samples has been carried out. It has been shown that the heterovalent A2+ substitution result in the formation of oxygen vacancies in the host lattice. The solid solutions have been found to possess a rhombohedrally distorted perovskite structure described by the space group R3c. Magnetization measurements have shown that the magnetic state of these compounds is determined by the ionic radius of the substituting elements. A-site substitution with the biggest ionic radius ions has been found to suppress the spiral spin structure of BiFeO3 giving rise to the appearance of weak ferromagnetism.

scholarly journals A non-mathematical introduction to the superspace description of modulated structures

2009 ◽  
Vol 65 (3) ◽  
pp. 249-268 ◽  
Author(s):  
Trixie Wagner ◽  
Andreas Schönleber
Keyword(s):  
Crystal Structure ◽  
Data Processing ◽  
Reciprocal Lattice ◽  
Molecular Compound ◽  
Modulated Structure ◽  
X Ray ◽  
Modulated Structures ◽  
Structure Solution ◽  
Superspace Description ◽  
Complete Process

The X-ray analysis of (6R,7aS)-6-(tert-butyl-dimethylsilanyloxy)-1-hydroxy-2-phenyl-5,6,7,7a-tetrahydropyrrolizin-3-one, C19H27NO3Si, revealed a diffraction pattern which is typical for modulated structures: strong Bragg peaks surrounded by weaker reflections which cannot be indexed with the same three reciprocal lattice vectors that are used to describe the strong peaks. For this class of crystal structures the concept of superspace has been developed which, however, for many crystallographers still constitutes a Gordian Knot. As a possible tool to cut this knot the crystal structure of the above-mentioned tetrahydropyrrolizinone derivative is presented as an illustrative example for handling and describing the modulated structure of a typical pharmaceutical (i.e. molecular) compound. Having established a working knowledge of the concepts and terminology of the superspace approach a concise and detailed description of the complete process of peak indexing, data processing, structure solution and structure interpretation is presented for the incommensurately modulated crystal structure of the above-mentioned compound. The superspace symmetry applied is P21(α0γ)0; the (incommensurate) q vector components at 100 K are α = 0.1422 (2) and γ = 0.3839 (8).

PrBa2Cu3Ox Polycrystalline Superconductor Preparation

1998 ◽  
Vol 12 (29n31) ◽  
pp. 3278-3283 ◽  
Author(s):  
W. L. Hults ◽  
J. C. Cooley ◽  
E. J. Peterson ◽  
J. L. Smith ◽  
Howard A. Blackstead ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Partial Pressure ◽  
High Temperatures ◽  
Sintering Temperature ◽  
Weak Ferromagnetism ◽  
Electromagnetic Properties ◽  
Oxygen Level ◽  
Partial Pressure Of Oxygen ◽  
Preparation Conditions

We prepared many samples of nominal PrBa2Cu3O x as ceramic, polycrystalline pellets with an enormous variety of preparation conditions and can confirm its superconductivity at T c = 89 K. We found that the superconductivity is in material with the YBa2Cu3O7 (YBCO) crystal structure. We observed weak ferromagnetism (canted antiferromagnetism) in samples prepared at high temperatures with a low partial pressure of oxygen; these samples also contained the phase PrBaO3 . The electromagnetic properties of the material depend sensitively on preparation conditions, especially the sintering temperature and the oxygen level.

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