Synthesis of heterovalently substituted slab perovskites Sr 2–xLnxBIV1–xBxIIIO4(BIV = Sn, Ti, BIII = Sc, In)
DOI:
https://doi.org/10.15407/dopovidi2021.01.077Keywords:
isomorphism, slab perovskite-like structure, solid solution, X-ray powder diffractionAbstract
The possibility of the heterovalent substitution of A- and B-positions atoms in a single-layer slab perovskitelike structure of strontium titanate and stannate Sr2BIVO4 (BIV = Ti, Sn) by type Sr2–xLnxBIV1–xBxIIIO4 (Ln = La – Tb, BIV = Ti, Sn, BIII = Sc, In) has been established by X-ray powder diffraction methods. The boundaries of the heterovalent substitution of A- and B-positions atoms and the crystallographic parameters of the synthesized Sr2–xLnxBIV1–xBxIIIO4 phases with a single-layer structure are determined. The continuous phase area formation with a single-layer structure has been observed in 10 systems: Sr2–xLnxTi1–xScxO4 (Ln = La, Pr, Nd, Sm, Eu), Sr2–xLnxTi1–xInxO4 (Ln = La, Pr), Sr2–xLaxSn1–xScxO4, Sr2–xLnxSn1–xInxO4 (Ln = La, Pr). Increasing the degree of heterovalent substitution of atoms in these systems leads to a reduction of the sym metry of the crystal lattice of phases from the tetragonal (space group I4/mmm) to the interconnected rhombic one. In the rest of the studied Sr2–xLnxBIV1–xBxIIIO4 systems, the existence of a narrow (x value significantly less than 1) phase region with a single-layer structure based on Sr3BIVO7 is observed. The character of the phase relations in the Sr2–xLnxBIV1–xBxIIIO4 systems (Ln = La – Tb, BIII = Sc, In) (BIV = Sn, Ti) and the linear type of concentration dependences of the parameters of the reduced tetragonal unit cells of Sr2–xLnxBIV1–xBxIIIO4 phases with a single-layer structure indicate that, by their nature, these phases are series of solid solutions in the pseudobinary systems Sr2BIVO4 – SrLnBIIIO4 (BIV = Ti, Sn, BIII = Sc, In). The obtained data can be used to regulate the functional properties of titanates and stannates Sr2BIVO4 and materials based on them, as well as to solve the problem of a purposeful search for new compounds of the type An+1BnO3n+1 with a slab perovskite-like structure.
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