Thermal Stability of Complex Aluminates in the La2SrAl2O7–Ho2SrAl2O7 System

Continuous solid solutions of two-layer (La1 – xHox)2SrAl2O7 aluninates, which are Ruddlesden–Popper phases, have been found to exist in the La2SrAl2O7–Ho2SrAl2O7 system at temperatures above 1515°С. The (La1 – xHox)2SrAl2O7 complex aluminates crystallize in tetragonal crystal system (space group I4/mmm). A phase transformation scheme has been proposed for the La2SrAl2O7–Ho2SrAl2O7 system with the unlimited mutual solubility of the components at high temperatures and with a decomposition area below the critical temperature Тcr = 1515°С.

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