Mechanical stability of TiO2 polymorphs under pressure: ab initio calculations
2008 (English)In: Journal of Physics: Condensed Matter, ISSN 0953-8984, Vol. 20, no 34, 345218- p.Article in journal (Refereed) Published
First-principles calculations using plane-wave basis sets and ultrasoft pseudopotentials have been performed to study the mechanical stabilities of the rutile, pyrite, fluorite and cotunnite phases of titanium dioxide (TiO2). For these polymorphs, we have calculated the equilibrium volumes, equations of state, bulk moduli and selected elastic constants. Compared to the three phases rutile, pyrite and fluorite, the recently discovered cotunnite phase shows the highest c44 for all pressures considered. Cotunnite also shows the highest bulk modulus amongst the four studied phases at an ambient pressure of B0 = 272 GPa.
Place, publisher, year, edition, pages
2008. Vol. 20, no 34, 345218- p.
IdentifiersURN: urn:nbn:se:uu:diva-97990DOI: 10.1088/0953-8984/20/34/345218ISI: 000258317600021OAI: oai:DiVA.org:uu-97990DiVA: diva2:173139