Tolerance factor for hexagonal RMnO3 structures

Abstract

Tolerance factor for hexagonal RMnO3 structures

Rudskaya A.G., Shevchuk A.V., Kupriyanov M.F.

Incoming article date: 12.12.2016

For hexagonal structures RMnO3, where R - rare earth ions are Er, Tm, Yb, Lu, and Y entered anisotropic relative tolerance factor tx / tz. A correlation tx / tz with changes spontaneous polarization (strain) on the temperature and pressure, with a lattice parameter changes from the radii R ion concentration and changes in the structural parameters of R1-xAxMnO3 (A - Ca, La) solid solutions. It is shown that an increase in the Neel temperature TN corresponds to a decrease in tx / tz, with an increase tx / tz external pressure - increased temperature phase transitions in structures RMnO3 and concentration phase transitions Y1-xAxMnO3 (A - Ca, La) correspond to abrupt changes in tx / tz.

Keywords: tolerance factor, hexagonal ABO3 structure, chemical composition, temperature, pressure, solid solution