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Temperature-dependent synchrotron powder diffraction measurements have been performed on lead-free ferroelectric (K 0.37 Na 0.52 Li 0.03 )(Nb 0.87 Ta 0.1 Sb 0.03 )O 3  ceäramics. The measurement was performed from 20 °C to 400 °C with 20 °C steps. The diffraction patterns showed the existence of two phases from 20 °C to 180 °C while the ferroelectric to paraelectric phase transition occurred between 340 °C and 360 °C. Rietveld refinement using the Fullprof software was employed and the two-phase region was refined using a combination of the orthorhombic phase with space group  Amm 2 (38) and the tetragonal phase with space group  P 4 mm  (99) from 20 °C to 180 °C. The tetragonal phase was used for the refinement up to 340 °C while the cubic phase was refined with space group  Pm -3 m  (221). Good refinement structure parameters were obtained for all temperatures with the average G.O.F being approximately 4.0. Information about the cell parameters and weight fraction of the phases were obtained as a function of temperature.

Temperature-dependent synchrotron powder diffraction phase studies of (K 0.37 Na 0.52 Li 0.03 )(Nb 0.87 Ta 0.1 Sb 0.03 )O 3 ferroelectric ceramics