Ultrasonic phonon behavior near the pressure-induced cubic-to-orthorhombic transformation in PbF2
| Autor: | R.J. Sladek, M.H. Chao, D.S. Rimai |
|---|---|
| Rok vydání: | 1980 |
| Předmět: |
Condensed matter physics
Chemistry Phonon Transit time General Chemistry Condensed Matter Physics law.invention Transverse plane Nuclear magnetic resonance Transformation (function) law Materials Chemistry Condensed Matter::Strongly Correlated Electrons Ultrasonic sensor Orthorhombic crystal system Hydrostatic equilibrium Softening |
| Zdroj: | Solid State Communications. 35:213-216 |
| ISSN: | 0038-1098 |
| DOI: | 10.1016/0038-1098(80)90482-2 |
| Popis: | Measurements have been made of the transit times τ of pulses of 30 MHz longitudinal and transverse ultrasonic waves in PbF2 at room temperature using hydrostatic pressures up to where the irreversible cubic-to-orthorthombic transformation occurs (near 4 kbar). Above 3 kbar 1/τ no longer increased linearly with pressure and exhibited some time dependence at fixed pressures before echo disappearance. The elastic stiffness moduli showed no significant softening before the transformation began. Length, mass density, and X-ray measurements on samples after they had been returned to 1 bar confirmed that milky white regions in them were orthorhombic but filled with defects. |
| Databáze: | OpenAIRE |
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