Standard Properties of Seignette Electric Crystals with Rectangular Loop of Dielectric Hysteresis

摘要

The investigations have shown, that Seignetto-electric materials are suitable for the obtainment of reference voltages. Seignetto-electric bismuth titanate-flakes have a series of additional advantages, because bismuth titanate appears to be a crystal insoluble in water. Bismuth titanate can also be used when checking and graduating (calibrating) voltmeters. In latter cases the reference voltages obtained on capacitance C2 (see Figure 2) can serve as exemplary because they are retained with high degree of accuracy. The properties of Seignette-electrics depend sharply upon temperature only in the zone of phase conversion, and that is why Seignettoelectrics with low Curie temperature, such as for example, Triglycine sulfate, do not assure necessary temperature stability of the TK value of reference voltage. The advantages of Seignette-electric reference voltage sources lie in their exceptional simplicity, inexpensiveness and highly compact dimensions. The necessary magnitude of reference voltage can be obtained by changing the capacitance. Seignette-electrics are capable of functioning at high and at low voltages as well, and this offers the possibility of employing same in combination with semiconductor instruments.