Abstract
The compositions of multicomponent R(Mk+, M+, Mrn+, Mn+)O3 systems formed by complex perovskites R(M′ 1-x M″x )O 3 can be represented graphically on the plane by an usual concentration square only if k = l, m = n. If k ≠ 1 ≠ m ≠ n the graphical representation is also possible but by some non-quadratic quadrangles. Peculiarities of these quadrangles are described and discussed.
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