Abstract
The possibilities of using nanocomposite material µ-methoxo (copper (II), bismuth (III)) acetylacetonate (I), the following composition: Cu3Bi(AA)4(OCH3)5, де HAA = H3C–C(O)–CH2–C(O)–CH3, as a magnetoresistive sensitive element, in a frequency transducer of a magnetic field. In order to create a suitable heterometallic complex compound, a method for its synthesis was developed. The structure, composition and physicochemical properties of the synthesized nanocomposite material were confirmed on the basis of elemental, X-ray phase analyzes, magnetochemical, IR spectroscopic and thermogravimetric studies. According to research, the density of the corresponding material 𝜌=5,659⋅103 g/m3, the mass of one molecule 𝑚0 = 157,837⋅10−26 kg, the number of valence electrons 𝑁=1450,715⋅1019, which made it possible to calculate the concentration of charge carriers at a temperature of 323 K: 𝑛=82.1⋅1028 m−3. The study of the electrical properties of µ-methoxo (copper (II), bismuth (III)) acetylacetonate in compressed form in the temperature range 323 - 393 K showed that with increasing temperature, its resistivity drops sharply from 8·107 to 70 Ohm·cm, which is typical for semiconductor materials. Based on these data, the band gap 𝛥𝛦 = 2.18 eV was determined. Calculations have shown that this material is a semiconductor, with current carriers of both signs. The dependence of the concentration of charge carriers on the temperature is obtained. The model of the frequency transducer, on the basis of the autogenerator from bipolar to field-effect transistors is considered. Simulation of this scheme was performed in the program LTspice XVIII. Based on this model, the I – V characteristics of this transducer, the dependence of the current, voltage and frequency of the output signal when changing the resistance of the magnetically sensitive resistor. The graph of dependence of frequency of an output signal on induction of a magnetic field on the basis of which sensitivity of the given transducer is defined is received
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