Phase Transformations in Calcium-Substituted Lanthanum Ferrite

Stability and Decomposition of Ca-Substituted Lanthanum Ferrite in Reducing Atmospheres

Physical and Magnetic Properties of Calcium-Substituted Li-Zn Ferrite

The effect of Ca-substitution on the physical and magnetic properties of Li0.3-0.5xZn0.4CaxFe2.3-0.5xO4 ferrites (x = 0.0, 0.01, 0.02, 0.03, and 0.05), prepared by the standard ceramic method, has been studied. It is found that the saturation magnetization increases up to x = 0.01 and then it decreases. On the other hand, the initial permeability decreased while the Curie temperature remained a...

Oxygen Surface Exchange Kinetics on Sr-Substituted Lanthanum Manganite and Ferrite Thin-Film Microelectrodes

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Spin Reorientation in Substituted Barium Ferrite

The structural transformation of substituted hexagonal ferrite powders BaFetoCoTiO~s prepared by mechanical milling, was investigated as a fimction of grinding time by means of MOssbauer spectrometry and static magnetic measurements. A spin reorientation is clearly evidenced from the temperature dependence of the hyperfine parameters and of the initial magnetic permeability on the powder mechan...

Ionic Conductance Changes in Lobster Axon Membrane When Lanthanum Is Substituted for Calcium

The trivalent rare earth lanthanum was substituted for calcium in the sea water bathing the exterior of an "artificial node" of a lobster axon in a sucrose gap. It caused a progressive rise in threshold, and a decrease in the height of the action potential as well as in its rates of rise and fall. Prolonged application produced an excitation block. Voltage-clamp studies of the ionic currents sh...