XAFS studies of local structure of functional materials with femtometer accuracy (2013 - 2016)
Principal Investigator: Juris Purāns
Project duration in years: 4 (2013-2016)
Latvian Science Council Grant No.402/2012
Sychrotron Radiation X-ray Absorption Spectroscopy has undergo remarkable developments: experiments with unprecedented accuracy under extreme conditions of high pressure and temperature can nowadays be performed. Therefore, fundamental effects can be studied from new wiepoint on the local structure with femtometer accuracy (10-5Å), that were not even conceivable just a few years ago:
1. Temperature dependent femto-XAFS studies of materials with negative thermal expansion (NTE) as ReO3, ScF3, ZrW2O8; nanoparticles and thin films as ReO3, NiO.
2. Temperature dependent femto-XAFS studies of isotopic effect on the lattice dynamics, phase transitions and anharmonic properties of SrTiO3, BaTiO3, KTiO3, ZnO.
3. In-situ femto-XAFS studies of intercaleted transition metal (TM) oxides as well as electro- and and thermochromic thin films: cathodic (WO3, ReO3, MoO3, TiO2, etc.); anodic (NiOx, IrO2-x); termochromic VO2-MgO, VO2-WO2, VO2-ReO2, VO2-IrO2.