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We investigated the oscillatory behaviours of chalcogenide glass switches of As_3-Ge_1-Te_6 system prepared by vaccum evaporation. The Ⅰ-Ⅴ characteristics in the OFF state are in good agreement with the Poole-Frenkel model for a certain range of applied voltage, and give an activation energy of about 0.47ev. When the ON current is limited below some critical value with increased load resistance, relexation type oscillations ocuur. When the load resistance is small compared with that of internal resistance of the unit, the period of oscillation is approximately described by an equation, to=-2.32GR_Llog_10 (1-Vth/Vi), The aqureement of the period wich experimental results indicates that the unit temperature is maintained below 90C. Non-relaxation type oscillations are also overved at the turning points from OFF state to On state, and show some behaviour common with amplifing action.
A measurement system for the magnetic and mechanical properties of soft magnetic sample with ribbon shape is designed and built. It consists of two parts ; the one is a B-H loop tracer, and the other is a magnetostriction measurement system. The main features of B-H Loop tracer are as follow ; (1) Demagnetizing ; exciting, and measuring of B processes are automatically programmed with variable amplitude, duration and frequency. (2) 2 channel digital wave memory specially designed and built for the recording and displaying of B and H makes measurable range of frequency large, (3) High sensitivity ; 10^3㎜×1㎜×150㎜ sample with mass of 20㎎ is sufficient to measure of B in full range, (4) Fitting a sample to measuring position easy, no need of winding of toroidal, etc. The magnetostriction measuring apparatus is essentially a high sensitive length comparator, which is composed of length-to-frequency converter and counter. The maximum resolving power is 100A。 and the thermal stability is about 2×10^-6/℃. Young's modulus and thermal expansion can be measured also. # Supported in part by the Ministry of Education.
The formation of aqueous tape with acrylic emulsion binder has been carried out. Glass frit and alumina filler as ceramic powder, DI-water as solvent , SN-5468( silane ) as dispersant was used. The acrylic emulsion ( CK- 108) have an advantage of viscosity. Viscosity was not increased in spite of increasing binder content. So we can increase solid loading. But viscosity was too low , so we have trouble on tape casting. then we added R-DH ( viscous additive ). So we formed not volatile , toxic but friendly environment aqueous green tape. and then analyze mechanical properties , investigate microstructure ( use SEM ).
It was reported^1) that the DA of Ferromagnets (Decrease of initial Permeability with time after damagnetization) was affected with the magnetizing field H applied to measure DA even at low H less than 10 mOe. Moreover Negative DA (increase of permeability after demagnetization) are observed frequently. To clarify these effects, some new measuring methods are examined. (1) Demgnetization Process : constant amplitude A.C demagnetization field precedes usual exponentially decaying amplitude. (2) B-H relation is measured only one or two cycles in a few milliseconds by digital processing techic. The detail of the results are dicussed.