Polymorphs Sentence Examples
Polyhedral models of silica polymorphs Silica, SiO 2, exists in a number of different crystalline forms.
Again, the pyroxenes, RS103 (R=Fe, Mg, Mn, &c.), assume the forms (I) monoclinic, sometimes twinned so as to become pseudo-rhombic; (2) rhombic, resulting from the pseudo-rhombic structure of (I) becoming ultramicroscopic; and (3) triclinic, distinctly different from (I) and (2); (I) and (2) are polysymmetric modifications, while (3) and the pair (I) and (2) are polymorphs.
At the same time there may be conditions of temperature and pressure at which polymorphs may exist side by side.
Lehmann and (2) polymorphs in which the transformation proceeds in one direction only - termed " monotropic."
It is doubtful indeed whether any general conclusions can yet be drawn as to the relations between crystal structure and scalar properties and the relative stability of polymorphs.Advertisement
The insufficiency of this argument, however, is shown by the data for arsenious and antimonious oxides, and also for the polymorphs of calcium carbonate, the more symmetrical polymorphs having a lower density.
The minerals are generally found together - a feature rarely met with in the case of polymorphs.
In both cases, we need extensive experimental studies seeking to identify all long-lived polymorphs in order to understand the kinetic factors involved.
A person skilled in the art, on simply reading both documents, would therefore think that they identified different polymorphs.
This should ensure that the data-mining analysis could find the most effective correlation between the observed polymorphs and the predicted thermodynamic and kinetic properties.Advertisement
Hence, we need to rationalize the kinetic factors that can lead to the observation of metastable polymorphs.