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As a result of synthesis of La 1-xCaxMnO 3  with  x  = 0 ÷ 0.7 from different precursors, perovskite phases are formed with different deviations from stoichiometry. It leads to the existence of orthorhombic phase (solid-phase synthesis) and rhombohedral phase (wet synthesis methods) at room temperature. Crystallographic method for estimating the nonstoichiometric parameters  x  and  y  in La 1-xMn 3+1-yMn 4+yO 3  composition, based on the analysis of the elastic interatomic bonds, was used to determine the content of Mn 3+  and Mn 4+  ions in the solid solutions of La 1-xCaxMn 3+1-yMn 4+yO 3 , prepared by sorption, co-precipitation, and solid-phase synthesis.

ferroelectrics

Refinement of the nonstoichiometric coefficients  x  and  y  for the perovskite compounds  A                  1-                                      x A ′                     x B                  1-                                      y B ′                     y O                  3