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The processes of phase formation in the La 2 O 3 -Ho 2 O 3 -SrO-Al 2 O 3 system are investigated in the temperature range 1200-1500°C. The structural characteristics of the compounds described in the studied system are presented. It is established that the formation of (La 1 -x Ho x ) 2 SrAl 2 O 7 solid solutions proceeds through the formation of LaAlO 3 , LaSrAlO 4 , SrAl 2 O 4 , and SrHo 2 O 4 compounds. An increase in the holmium content and the temperature leads to a crossover from the mechanism in which the interaction of LaAlO 3 and LaSrAlO 4 is a limiting stage to the mechanism in which the decisive role is played by the interactions of SrAl 2 O 4 with

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In den untersuchten Systemen werden Bereiche der Entmischung festgestellt.

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