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Effect of uniaxial pressure on the ferroelectric phase transition in PbGeO

Journal of Physics Condensed Matter, ISSN: 0953-8984, Vol: 11, Issue: 5, Page: 1341-1352
1999
  • 18
    Citations
  • 0
    Usage
  • 2
    Captures
  • 0
    Mentions
  • 0
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Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    18
    • Citation Indexes
      18
  • Captures
    2

Article Description

The effect of uniaxial pressure (X) up to 1 kbar, applied along the three main directions, on the Curie temperature and the dielectric constant ε of a PbGeO single crystal was investigated. The Curie temperature decreases with uniaxial pressure and the coefficient γ (γ ≡ ∂T/∂(X) was determined as -6.5, -7.0 and -3.2 K kbar for a-, b- and c-axis respectively. It has been found that uniaxial pressure applied along the c-axis strengthens the second order phase transition but applied along the directions perpendicular to the c-axis it may induce a tricritical point. The critical uniaxial pressure was estimated from the ratio C /C against X to be about 2.4 kbar. A tentative description of the mechanism of changes in the phase transition order is given. The phenomenological relation describing γ is also discussed.

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