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Crystallographic Properties (crystallographic + property)

Distribution by Scientific Domains

Chemistry	50%
Polymers and Materials Science	33%

Selected Abstracts

Crystallographic Properties of ErFe6Sn6-xGax Compounds (0 < x < 6).

CHEMINFORM, Issue 36 2005
H. Ihou-Mouko
Abstract For Abstract see ChemInform Abstract in Full Text. [source]

Ferromagnetism in diluted magnetic semiconductors Ti1,xMxO2 (M = V, Cr, Mn and Ni)

PHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 12 2006
N. Shimizu
Abstract Diluted magnetic semiconductors Ti1,xMxO2 (M = V, Cr, Mn, Fe, Ni and Cu) with x = 0.005 have been studied in a single crystal form. We have succeeded in growing Ti0.995M0.005O2 single crystals for M = V, Cr, Mn and Ni with the Rutile crystal structure by floating zone method, while it was not successful for M = Fe and Cu. It is found that the physical properties of these single crystals are greatly influenced by growth atmospheres. Among these crystals grown in a low oxygen partial pressure, Ti0.995M0.005O2 with M = Ni exhibited a typical ferromagnetic behavior even at room temperature. Crystallographic properties as well as magnetism have been studied. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

The cross-correlation function: main properties and first applications

JOURNAL OF APPLIED CRYSTALLOGRAPHY, Issue 2 2010
Benedetta Carrozzini
When a model structure, and more generally a model electron density ,M(r), is available, its cross-correlation function C(u) with the unknown true structure ,(r) cannot be exactly calculated. A useful approximation of C(u) is obtained by replacing exp[i(,h , ,Mh)] by its expected value. In this case C,(u), a potentially useful approximation of the function C(u), is obtained. In this paper the main crystallographic properties of the functions C(u) and C,(u) are established. It is also shown that such functions may be useful for the success of the phasing process. [source]

Evaluation of SnB for the location of anomalous scattering atoms in SAD/MAD phasing

JOURNAL OF APPLIED CRYSTALLOGRAPHY, Issue 6 2003
Jun Wang
Sixteen existing single-wavelength/multi-wavelength anomalous diffraction (SAD/MAD) data sets with a broad range of crystallographic properties have been used to investigate the various parameters in SnB with the goal of finding the optimum values for locating the positions of anomalous scatterers. The results of the analysis indicate some changes in default parameters that may be useful for non-routine and difficult cases. [source]

Influence of a Ceramic Substrate on Aqueous Precipitation and Structural Evolution of Alumina Nano-Crystalline Coatings

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, Issue 1 2007
Marie Mahé
Either boehmite (,-AlOOH) or gibbsite (,-Al(OH)3) nanocrystalline thin films (h,100 nm) can be precipitated from AlCl3 solution at fixed pH and temperature onto different substrates. It depends on the nature of the substrate (mica flakes, SiO2 flakes, or ,-Al2O3 flakes), on their crystallographic properties (crystalline or amorphous), and on some experimental parameters (agitation rate, addition rate). According to the surface charge of the substrates, different alumina species are involved in the precipitation process. When negative charges are present on the substrate, the [Al3O(OH)3(OH2)9]4+ polycation is promoted, leading to the formation of the (Al4) tetramer ([Al4O(OH)10(OH2)5]o) and then to the precipitation of bohemite. When positive charges are present, a ligand bridge containing complex ([Al3O(OH)3(O2H3)3(OH2)9]+) is likely favored, giving rise to hexagonal ring structures or amorphous solids that lead to the formation of gibbsite. Besides the surface effects, crystalline substrates can act as a template during precipitation of aluminum species as shown for the formation of gibbsite on muscovite. Finally, calcination at 850°C of boehmite samples leads to porous ,-Al2O3 layers, while calcination of gibbsite leads to ,-Al2O3 layers. [source]

Influence of chitosan characteristics on polymer properties.

POLYMER INTERNATIONAL, Issue 2 2003
I: Crystallographic properties
Abstract The properties of chitosan depend on several parameters including its origin (shrimp, squid, fungi etc), characteristics (mol fraction of N -acetylation; molecular weight) and treatments used to condition it (dissolving, precipitation, drying). These parameters can influence the material's sorption properties for metal ions. It has been suggested that the changes in sorption properties are related to the crystallinity of the material. The present work focuses on the study of the crystallographic properties of samples prepared from shrimp, squid and fungi sources, with different characteristics and conditioned by several physical treatments (dissolving, reprecipitation and drying, including oven-drying, freeze-drying), prior to subsequent studies of their sorption properties for platinum (discussed in Part II of this manuscript). © 2003 Society of Chemical Industry [source]