The Effect of Hydrostatic Pressure on the Curie Point of Barium Titanate Single Crystals

W. J. Merz

doi:10.1103/PhysRev.78.52

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The Effect of Hydrostatic Pressure on the Curie Point of Barium Titanate Single Crystals

W. J. Merz

Laboratory for Insulation Research, Massachusetts Institute of Technology, Cambridge, Massachusetts

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Phys. Rev. 78, 52 – Published 1 April, 1950

DOI: https://doi.org/10.1103/PhysRev.78.52

Abstract

The influence of hydrostatic pressure on the Curie temperature of BaTi $O_{3}$ single crystals has been investigated. With increasing pressure a linear shift of the Curie point towards lower temperature is observed with a slope of -5.8× $10^{- 3}$ degree/atmos. This information allows us to calculate the change of the specific heat and of the compressibility at the Curie point according to Ehrenfest's relation. Thus it is possible to relate the pressure effect to the change of the lattice constant. The decrease of the Curie temperature with shrinking lattice constant is nearly the same as that observed when Sr ions are substituted for Ba in the titanate crystal. In addition, measurements have been made on the influence of pressure on the first order transition point near 0°C.

References (17)

A. von Hippel and co-workers, NDRC Contract OEMsr-191, Reps. VII (August, 1944) and XI (October, 1945) von Hippel, Breckenridge, Chesley, and Tisza, J. Ind. Eng. Chem. 38, 1097 (1946)
S. Roberts, Phys. Rev. 71, 890 (1947)
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R. D. Burbank and H. T. Evans, Jr., Acta Cryst. 1, 330 (1948)
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W. J. Merz, Phys. Rev. 75, 687 (1949) ibid.76, 1221 (1949)
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P. Ehrenfest, Comm. Univ. Leiden, Suppl. 75b (1933)
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H. Blattner and W. J. Merz, Helv. Phys. Acta 21, 210 (1948)
L. Tisza, "On the General Theory of Phase Transitions," N.R.C. Symposium, Cornell University, August, 1948
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[c1] A. von Hippel and co-workers, NDRC Contract OEMsr-191, Reps. VII (August, 1944) and XI (October, 1945) von Hippel, Breckenridge, Chesley, and Tisza, J. Ind. Eng. Chem. 38, 1097 (1946)

[c2] S. Roberts, Phys. Rev. 71, 890 (1947)

[c3] B. T. Matthias and A. von Hippel, Phys. Rev. 73, 1378 (1948)

[c4] R. D. Burbank and H. T. Evans, Jr., Acta Cryst. 1, 330 (1948)

[c5] P. W. Forsbergh, Jr., Phys. Rev. 76, 1187 (1949)

[c6] W. J. Merz, Phys. Rev. 75, 687 (1949) ibid.76, 1221 (1949)

[c7] B. T. Matthias, Phys. Rev. 75, 1771 (1949)

[c8] D. Bancroft, Phys. Rev. 53, 587 (1938)

[c9] P. Ehrenfest, Comm. Univ. Leiden, Suppl. 75b (1933)

[c10] H. D. Megaw, Proc. Roy. Soc. 189, 261 (1947)

[c11] B. M. Wul, J. Phys. USSR 10, 95 (1946)

[c12] Harwood, Popper, and Rushman, Nature 160, 58 (1947)

[c13] H. Blattner and W. J. Merz, Helv. Phys. Acta 21, 210 (1948)

[c14] L. Tisza, "On the General Theory of Phase Transitions," N.R.C. Symposium, Cornell University, August, 1948

[c15] A. J. C. Wilson, Phys. Rev. 54, 1103 (1938)

[c16] W. P. Mason, Phys. Rev. 74, 1134 (1948)

[c17] D. F. Rushman and M. A. Strivens, Trans. Far. Soc. 42A, 231 (1946)

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The Effect of Hydrostatic Pressure on the Curie Point of Barium Titanate Single Crystals

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