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The existence of two or more crystalline or molecular structural forms of an element that have different chemical or physical attributes.

al′lo·trop′ic (ăl′ə-trŏp′ĭk, -trō′pĭk), al′lo·trop′i·cal adj.
al′lo·trop′i·cal·ly adv.
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Adj.1.allotropic - of or related to or exhibiting allotropism; "carbon and sulfur and phosphorus are allotropic elements"
References in periodicals archive ?
Although various materials of nanolevel dimensions have been considered for the modification of polymers, carbon-based nanofillers probably have gained the greatest interest largely due to intrinsic properties of carbon itself as well as because of the broad spectrum of allotropic forms in which the filler is available: diamond, graphite, fullerenes, nanotubes, graphene, etc.
Integrin, an allotropic cell adhesion molecule, mediates the interaction between a cell and extracellular matrix (ECM), thereby facilitating tumor metastasis.
On thermo-chemical treatment it is necessary that the steel, in contact with a substance able of supplying Carbon, is heated up at temperature higher than the critical zone (880 to 980[degrees]C), for the iron to be turned into gamma allotropic form.
The allotropic form of Aragonite has got huge applications in research consideration because of its biocompatible properties.
after 3 h milling) according to formula (2) is greater than 1KJ/mol, which is enough for the direct generation of single-cubic phase Co in cobalt oxalate during the thermal decomposition reaction (1) and to overcome the phase transformation during cooling, thus allowing it to maintain the structure even at room temperature (cubic-Co free energy of formation is 251 J/mol and the critical driving force of allotropic transformation is -160 J/mol) [4].
Creation and destruction of atomic bonds was observed and high state energy of Ti--Si bond indicates the existence of different allotropic phases, [beta]--phase or an [alpha]/[beta] combination.
The chemical-thermal treatment of nonferrous metals and alloys, which undergo allotropic or phase transformations during heating and characterized by a wide temperature interval of existence of high-temperature modification, is one of the most common methods to improve the durability of structures' components.
It is shown by several studies that precipitation depends on certain allotropic forms of calcium carbonate.
The pale yellow nonmetallic element occurs widely in nature in several free and combined allotropic forms and is used in black gunpowder, rubber vulcanization, the manufacture of insecticides and pharmaceuticals, and in the preparation of sulpher compounds such as hydrogen sulfide and sulpheric acid.
There is another ego, according to whose action the individual is unrecognizable, and passes through, as it were, allotropic states which it needs a deeper sense than any we've been used to exercise, to discover are states of the same single radically-unchanged element.
121] showed that P aeruginosa SNT1 biosynthesized nanostructured selenium by biotransforming selenium oxyanions to spherical amorphous allotropic elemental red selenium both intracellularly and extracellularly.
This is suggested by the fact that in most cases of Table I of allotropic modifications, one of the lattices is layer-like (1) .