Abstract: An object is to provide a method for completely and fully dehalogenating an organic halide through electrolysis, and an electrolysis apparatus used therefor. One embodiment of the invention is a method wherein, when carrying out dehalogenation by electrolyzing an organic halide or a liquid containing the organic halide, a diaphragm electrolytic cell in which an anode and a cathode are separated is used, and electrolysis is carried out while applying ultrasonic waves using ultrasonic wave generating means and stirring using stirring means, and an electrolytic cell used therefor. Another embodiment of the present invention is a method wherein, when carrying out electrolysis, a hydrogen-absorbing metal or alloy is used as a cathode. In this case also, it is preferable to further use a diaphragm electrolytic cell, and carry out electrolysis using ultrasonic wave generating means and stirring means.

Abstract: This invention provides an amorphous ferromagnetic oxide represented by the formulaA.sub.x.(MmOn).sub.y.(Fe.sub.2 O.sub.3).sub.zwherein A represents at least one of Bi.sub.2 O.sub.3, V.sub.2 O.sub.5, TeO.sub.2 and GeO.sub.2 ; M represents at least one of Mn, Fe, Co, Ni, Cu, Mg, Zn, Cd, Ca, Pb, Ba, Sr and rare earth elements; when M is not a rare earth element, m=1 and n=1; when M is a rare earth element, m=2 and n=3; O<x.ltoreq.80, O<y.ltoreq.60 and 5.ltoreq.z.ltoreq.60 and x+y+z=100, provided that when M is Co, O<x<60, O<y<60 and 40.ltoreq.z.ltoreq.60, and processes for preparing the same.

Abstract: A recording medium is disclosed, which comprises as the main component an amorphous lead oxide or a lead oxide at the metastable state, having the formula of PbL.sub.x M.sub.y O.sub.z wherein L and M each indicate elements other than Pb and O. The recording mediums are drastically changed in their electrical properties and optical properties by application of heat, due to the characteristics inherent in the main component, and such changes make the recording medium highly useful for recording by laser light or heat.