Penetration of the electromagnetic field through plate-shaped bulk polycrystalline sintered Pb and Y–Ba doped manganite samples is studied in the frequency range from 20 kHz to 30 MHz. Strong magnetic-field dependence of the transmission coefficient is observed. The penetration data are compared with the other magnetic-field dependent parameters: the magnetic permeability, magnetoresistance, and magnetoimpedance. Unusual frequency dependence of the penetration depth is observed.

The phase composition and structure of equilibrium LaMnO 3 -CaMnO 3 -SrMnO 3 samples prepared at 1500 ° C in air are investigated. The results demonstrate that the system contains a broad region of La 1 − x ( Ca 1 − y Sr y ) x MnO 3 perovskite-like solid solutions in which calcium and strontium cations substitute for lanthanum. The solid solutions have an orthorhombic ( Pnma ), rhombohedral ( ), or tetragonal ( I 4/ mcm ) structure, depending on the A-site cation composition and the nature of lattice distortions. The composition regions of these structures and two-phase regions are mapped out in the LaMnO 3 -CaMnO 3 -SrMnO 3 phase diagram. R3c

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