Huntington, H. B. Department of Physics, Rensselaer Polytechnic Institute, Troy, New York.
MacCrone, R. K. Department of Physics, Rensselaer Polytechnic Institute, Troy, New York.
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A phenomenon in which a physical quantity depends not only on the temperature but also on the preceding thermal history. It is usual to compare the behavior of the physical quantity while heating and the behavior while cooling through the same temperature range. The illustration shows the thermal hysteresis which has been observed in the behavior of the dielectric constant of single crystals of barium titanate. On heating, the dielectric constant was observed to follow the path ABCD and so on, cooling the path DCEFG. See also: Ferroelectrics; Permittivity
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