High-pressure and high-temperature synthesis of the cubic <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mi mathvariant="normal">Ti</mi><msub><mi mathvariant="normal">O</mi><mn>2</mn></msub></mrow></math></span> polymorph

M. Mattesini; J. S. de Almeida; L. Dubrovinsky; N. Dubrovinskaia; B. Johansson; R. Ahuja

doi:10.1103/PhysRevB.70.212101

High-pressure and high-temperature synthesis of the cubic $Ti O_{2}$ polymorph

M. Mattesini^1,2,*, J. S. de Almeida¹, L. Dubrovinsky³, N. Dubrovinskaia³, B. Johansson^1,4, and R. Ahuja¹

¹Condensed Matter Theory Group, Department of Physics, Uppsala University, Box 530, SE-75121 Uppsala, Sweden
²Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, E-28049, Spain
³Bayerisches Geoinstitut, Universität Bayreuth, D-95440 Bayreuth, Germany
⁴Applied Materials Physics, Department of Materials and Engineering, Royal Institute of Technology, SE-10044 Stockholm, Sweden

^*Electronic address: maurizio.mattesini@uam.es

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Phys. Rev. B 70, 212101 – Published 1 December, 2004

DOI: https://doi.org/10.1103/PhysRevB.70.212101

Abstract

We report on an in situ observation of a cubic titanium dioxide polymorph. Experiments conducted on an anatase sample as starting material using a laser-heated diamond-anvil cell have shown that at a pressure of $48 GPa$ and temperatures between 1900 and $2100 K$ , the x-ray diffraction pattern contains reflections of two phases: the known cotunnite-structured $Ti O_{2}$ and the new cubic phase with lattice parameter $a = 4.516 (1) Å$ . Reflections of the cubic phase can be followed on decompression at ambient temperatures down to about $9 GPa$ . Our observations suggest that at high temperature and elevated pressure both IV $A B$ and IV $A$ element dioxides follow a common transformation path.

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High-pressure and high-temperature synthesis of the cubic $Ti O_{2}$ polymorph

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High-pressure and high-temperature synthesis of the cubic TiO2 polymorph

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High-pressure and high-temperature synthesis of the cubic $Ti O_{2}$ polymorph