crystal form

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crystal form

[¦krist·əl ′fȯrm]
(crystallography)
A collection of crystal faces generated by operating on a single face with a subgroup of the symmetry elements of the crystal class.
References in periodicals archive ?
Crystal transformation between different crystal forms occurred against temperature variation, and it has been found that the microstructure of the gels is influenced by the crystallization process; the self-supporting ionogel with a high mechanical strength was formed for the ionogel prepared at a cooling rate of 0.4[degrees]C/min.
LCBPP Crystallization Samples Preparation and Crystal Form Characterization
In the Atlas of 1801 the crystal forms, grouped together under specific mineral names, are designated only by figure numbers.
Some materials may crystallise in different crystal forms with differences in melting points, density and optical properties.
When an ice crystal forms and grows in a wheat plant, AFPs latch onto the crystal's surface, blocking further growth.
Generation features deep and slightly exaggerated cut patterns with varied but complementary cuts on contemporary crystal forms. Fifth Avenue Crystal is expanding its successful Portico crystal line to include several new serving pieces.
Apart from the surface, there are no significant variations in structure among the three crystal forms. Structural variations observed at the protein surface occur predominantly in regions of protein-protein contact.
The ligand-free structures reported here are in two different crystal forms, monoclinic and tetragonal systems.
It provides information on functional groups, crystal forms, hydrogen bonding, orientation, conformation, molecular symmetry, and other characteristics of large and small molecules.
Isotactic polypropylene (iPP), as a widely used and versatile polymer, is reported to have at least four different modifications: [alpha] (monoclinic) [1], [beta] (trigonal) [2, 3], [gamma] (orthorhombic) [4, 5], and smectic [1], These modifications have the same chain conformation (the classical [3.sub.1] helix), but with different crystal forms. Among these crystal fonns, the [beta]-crystal form has attracted the most attentions for its improvement in break, impact strength and energy consumption.
The new crystals also exhibit a great variety of crystal forms. Since our exploratory work ended in 1995, only small, cracked fragments of aragonite have been recovered from the fields around the hill; these fields are now being used as pastures, so further new discoveries of aragonite seem unlikely.
The fluctuations also correlate with periods when certain salts precipitated out of the oceans and when mineral-making animals, such as sponges and corals, switched between the production of two crystal forms of calcium carbonate.