View source for Physics:Orientational glass

In [[Physics:Solid-state physics|solid-state physics]], an '''orientational glass'''<ref>{{cite journal | last=Loidl | first=A. | title=Orientational Glasses | journal=Annual Review of Physical Chemistry | publisher=Annual Reviews | volume=40 | issue=1 | year=1989 | issn=0066-426X | doi=10.1146/annurev.pc.40.100189.000333 | pages=29–60| bibcode=1989ARPC...40...29L }}</ref> is a molecular [[Physics:Solid|solid]] in which [[Earth:Crystal|crystal]]line long-range order coexists with quenched disorder in some [[Physics:Degrees of freedom (mechanics)|rotational degree of freedom]].
An orientational glass is either obtained by quenching a [[Physics:Plastic crystal|plastic crystal]], (e.g. [[Chemistry:Cyclohexane|cyclohexane]], [[Chemistry:Levoglucosan|levoglucosan]]<ref>{{cite journal | last1=Moura Ramos | first1=Joaquim J. | last2=Diogo | first2=Hermínio P. | title=Orientational glass, orientationally disordered crystal and crystalline polymorphism: A further study on the thermal behavior and molecular mobility in levoglucosan | journal=Journal of Molecular Liquids | publisher=Elsevier BV | volume=286 | year=2019 | issn=0167-7322 | doi=10.1016/j.molliq.2019.110914 | page=110914| s2cid=164662415 }}</ref>), or it is a mixed crystal in which positional disorder causes additional disorder of molecular orientations, e.g. CN orientations in [[Chemistry:Potassium cyanide|KCN]]:[[Chemistry:Potassium bromide|KBr]].<ref>{{cite journal | last=Knorr | first=K | title=The Glasslike State of the Mixed Alkali Halide-Alkali Cyanides | journal=Physica Scripta | publisher=IOP Publishing | volume=T19B | date=1987-01-01 | issn=0031-8949 | doi=10.1088/0031-8949/1987/t19b/034 | pages=531–536| bibcode=1987PhST...19..531K }}</ref>

== References ==
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[[Category:Condensed matter physics]]
[[Category:Crystallography]]



{{Sourceattribution|Orientational glass}}