A value of about 20% relative change of the dielectric constant of mineral-oil-based ferrofluids was observed in an external magnetic field. The cluster model, based on a long-chain model, was proposed for the explanation of experimental data.

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The appearance and growth process of needle-like aggregates in thin films of magnetic fluid within a magnetic field are investigated. The results show that the average length of aggregates in a given magnetic field depends on the method of application of the magnetic field. However, the full needle length per unit area as a first approximation to a condensed phase volume is approximately the same.

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Chalcogenide glass GeS11, is irradiated by fast neutrons step by step within the range 1 × 1016 and 1 × 1019 neutrons cm−2. The creation of β and γ crystalline sulphur modifications in irradiated samples is interpreted as a consequence of so called thermal spikes, which are present in the small volume during interaction events. This is demonstrated by scanning electromicrographs. The evolution is shown of the sulphur crystalline modifications as a function of the neutron dose.

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The main purpose of this work is to determine the effect of neutron irradiation on the thermoelectric properties of GeSi alloys. The experimental values are interpreted by relatively simple expressions. Negative as well as positive changes of the investigated parameters are observed, which begin to appear if the concentration of radiation defects N′D is greater than the concentration of intrinsic defects ND0 before irradiation.