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In a previous paper' we described the magnetoelectric effect in Co ferrite-Ba titanate unidirectionally solidified eutectic, which can reach a conversion factor (a factor = 4n(dP/dH) 200 times higher than that of the best singlephase material at room temperature, CrzO3. We subsequently developed sintered composites with an inherently less ideal structure and therefore lower conversion factor, but easier fabrication. We also developed a new poling procedure, which minimizes ageing effects. This paper is focused on the last two items.

Trivalent bismuth forms fluorescence centers in its own compounds as well as in other systems in which it is present as an activator. The fluorescent emission consists of various bands lying between the ultraviolet and the red end of the spectrum. The relative intensity of these bands depends upon the nature of the host lattice and the temperature of observation.Sulfates and phosphates of the alkaline earth group show predominantly red fluorescence. The red fluorescence of Ca2P2O7:normalBi shows the remarkable feature that its temperature dependence is different for excitation by cathode rays and by x‐rays.

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