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the Basic effects and deductions.

1. For the first time the complex of experiments on examination vzaimoyosvjazi processes of switching and a self-warming up of samples of ceramics on a bottom tsirkonata-titanata lead and monocrystals firm rastvoyorov niobata barium-calcium is spent.

2. Independence of the macroscopical mechanism of processes peyorekljuchenija from material type is shown. Existence korreljayotsii between the frequency dependences of switched polarisation and self-warming up temperatures is erected. For all explored materials on chasyototnyh dependences there are three fields. The first field sootyovetstvuet to private loops of the dielectric hysteresis and the linear growth of temperature with frequency magnification; second - to the peak temperatures of a self-warming up and the peak values perekljuchaeyomoj polarisation; the third is characterised by exponential wane of switched polarisation with growth of frequency and simultaneous sniyozheniem self-warming up temperatures.

3. It is erected, that the warming up of samples occurs only in the course of formation of a loop of the dielectric hysteresis. It is revealed naliyochie critical frequency of an electric field at which having warmed up materials occurs to temperature, sufficient loop for evolution of the dielectric hysteresis from private in the full. Values of critical frequency are generally various and depend on type mayoteriala, its geometrical sizes, peak value naprjayozhennosti an electric field and the signal shape.

4. On the basis of approximation of experimental data it is gained anayoliticheskoe expression for the description of reduction switched poyoljarizatsii with growth of frequency of the electric field, corresponding to the exponential law. It is spotted greatest possible znayochenie switched polarisation of monocrystals CBN32 and keramiyoki ЦТС-19 for field gradient and shape preset values sigyonala. The relation of switched polarisation to peak vozyomozhnoj depends both on material type, and from peak znacheyonija an electric intensity and the signal shape. For CBN32 it makes 0.84; for ЦТС-19 in a sinusoidal floor amplitude 850 In/mm - 0.64, in pulsing fields in the form of a meander - 0.77 (at E = 850 In/mm), 0.49 (E = 700 In/mm) and 0.32 (E = 600 In/mm).

5. Influence of interior structure (the size of grains) ceramics TSTS on macroscopical performances of processes of switching and a self-warming up in a variable electric field is revealed.

6. The expedient of an estimate of a heat capacity per unit volume segnetoelekyotricheskih materials on quantity of thermal energy generated by samples in the course of a self-warming up is offered. The obtained data have hoyo
roshee the consent with literary data both for monocrystal CBN32, and for ceramics ЦТС-19.

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A source: Yeliseyev Anton Jurevich. PROCESSES of SWITCHING And the DIELECTRIC HYSTERESIS of CERAMICS TSIRKONATA-TITANATA of LEAD And MONOCRYSTALS NIOBATA of BARIUM of CALCIUM. The dissertation AUTHOR'S ABSTRACT on competition of a scientific degree of the candidate of physical and mathematical sciences. Tver - 2016. 2016

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