Abstract
Atomic order and magnetoresistive parameters are studied in La0.6Sr0.2Mn1.2−y CryO3 ceramics, in which Cr substituted for the above stoichiometric Mn content serves to enhance cluster formation in a solid solution. It is shown that in a range of 0.05<y<0.1, La0.6Sr0.2Mn1.2−y CryO3 experiences a phase transition from a partially disordered solid solution with a rhombohedral lattice \((R\bar 3c)\), in the form of planes possessing a long-range order and clusters of mesoscopic order, to a chemically microstratified solid solution, in the form of planes of an orthorhombic (Pnma) crystal lattice having a matrix structure and mesoscopic formations (clusters) coherently combined with a matrix of plane fragments peculiar to oxides of γ-MnO2 type or, at y>0.1, of Cr2O3 type. It is shown that the structural phase transition is accompanied by maximum changes of the magnetoresistive parameters in the same range of Cr concentrations, i.e., 0.05<y<0.10.
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Translated from Zhurnal Tekhnichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Fiziki, Vol. 72, No. 3, 2002, pp. 87–90.
Original Russian Text Copyright © 2002 by Samo\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \)lenko, Pashchenko, Cherenkov, Prokopenko.
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Samoilenko, Z.A., Pashchenko, V.P., Cherenkov, O.P. et al. Special features of the structure and properties of La0.6Sr0.2Mn1.2−y CryO3 magnetoresisitive ceramics. Tech. Phys. 47, 368–370 (2002). https://doi.org/10.1134/1.1463130
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DOI: https://doi.org/10.1134/1.1463130