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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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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Adj.1.allotropic - of or related to or exhibiting allotropism; "carbon and sulfur and phosphorus are allotropic elements"
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References in periodicals archive ?
Among their topics are his long passage from a rural to an industrial world, Lawrence and "The Machine Incarnate:" robots among the"Nettles," engineering away humanity: Lawrence on technology and mental consciousness in Lady Chatterley's Lover and Pansies, his allotropic gladiatorial: resisting the mechanization of the human in Women in Love, and on entertaining: the lassitude of his dead novel.
[34] in prospective cohort studies among a large group of women have demonstrated an association between prolonged exposure to this allotropic variant of oxygen and [PM.sub.2.5] and depression.
Analyst Saso Ordanovski suggests in Sloboden pecat that if the key political factors in the country led by Zaev and Gruevski's incarnations in the various allotropic political modifications decided to launch a process of mutual "forgiveness" and "reconciliation," it will be proper to include in the "historical package" the long since missed opportunity of banning the use of "VMRO" in the names of political parties in Macedonia.
Selenium is an allotropic metal, that can form many compounds with both oxygen and sulfur.
As reported in their seminal paper they were able to produce and characterize a new allotropic form of carbon, constituted by the 2-dimensional sheet that is graphene.
However, since the Co matrix undergoes an allotropic transformation from the low-temperature hexagonal closed-packed (hcp) structure to the high-temperature face-centred cubic (fcc) structure and showed a hysteresis, a two-phase matrix exists in Co-Re alloys at intermediate temperatures.
Studies have shown that small amounts of [H.sub.2][O.sub.2] together with Ti[O.sub.2] of the allotropic form rutile under light exposure is the most effective combination to degrade the organic dye Rhodamine B [22], as well as inactivate the multiresistant bacterium Klebsiella pneumoniae [23].
Van Hove, "Surface structures of the two allotropic phases of cobalt," Physical Review B: Condensed Matter and Materials Physics, vol.
Types Size (nm) Physicochemical properties Carbon 0.5-3 Third allotropic nanotubes (diameter) crystalline form of 20-1,000 carbon sheets either (length) single layer (single- walled nanotube, SWNT) or multiple layer (multiwalled nanotube, MWNT).
Although the properties of diamond and graphite have been extensively analyzed, other allotropic forms of carbon such as fullerene, carbon nanotubes (CNT), or graphene are of recent interest (Figure 1).
[103] to recent clinical trials supporting the feasibility of using gene therapy to treat this disorder through allotropic expression of the corrected mitochondrial gene sequences.
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.