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Abstract
The structural stability of cubic KMF3 (M: Mg, Zn, Co, Ni) perovskites has been studied by powder X-ray diffraction under pressure. Neither superlattice reflections nor peak splitting associated to a phase transition were detected in the 0–10 GPa pressure range. Furthermore, KMgF3 showed no structural changes up to 50 GPa. The results were compared with previous reports on isostructural KMnF3. Tolerance factor and site parameters ratio have been analysed as high-pressure stability indexes for this family of perovskites.
Acknowledgements
One of the authors (F.A.) is indebted to the Spanish MEC for a postdoctoral grant. This research was partially supported by MICINN under project CSD2007-00045 (Consolider-Ingenio 2010). M. Kunz is thanked for support during high pressure experiments at ALS. This work was partially financed by SRS and ALS. The ALS is supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.