New Mixed Manganites-chromites RMn1-xCrxO3 and Manganites-gallates RMn1-xGaxO3

摘要

Nanocrystalline powders of new mixed manganites-chromites $Rmathrm{M}mathrm{n}{}_{1-x}mathrm{C}mathrm{r}_{x}mathrm{O}_{3}$(R=Pr, Sm, Er, x=0.5, 0.9) and manganites-gallates $Rmathrm{M}mathrm{n}_{1-x}mathrm{G}mathrm{a}_{X}mathrm{O}_{3}(R=mathrm{P}mathrm{r}$, Sm, Eu; $x=0.25,0.5,0.9)$ with orthorhombic perovskite structure were obtained by sol-gel citrate route. Crystal structure parameters and microstructural parameters of the materials were established depending on the synthesis conditions. Based on the results obtained formation of continuous solid solutions RMn1- ${}_{x}mathrm{C}mathrm{r}_{x}mathrm{O}_{3}$ in the $Rmathrm{M}mathrm{n}mathrm{O}_{3-}Rmathrm{C}mathrm{r}mathrm{O}_{3}$ systems and limited solid solutions in the $Rmathrm{M}mathrm{n}mathrm{O}_{3-}Rmathrm{G}mathrm{a}mathrm{O}_{3}$ systems were predicted.