Ultrasonic determination of the elastic properties and their pressure and temperature dependences in very dense YBa sub 2 Cu sub 3 O sub 7 minus x
- School of Physics, University of Bath, Claverton Down, Bath BA27AY (United Kingdom)
- Materials and Components Technology Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
The effects of hydrostatic pressure and temperature have been measured on the velocities of longitudinal and shear ultrasonic waves propagated in a very dense (96% of theoretical density) ceramic specimen of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}}. In YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} ceramics with such a high density, the effects of porosity on the elastic properties should be much reduced. Nevertheless the bulk modulus of this dense material has the same small magnitude (=55 GPa) as that measured ultrasonically in much less dense YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} ceramics. The temperature dependences of the velocities of longitudinal and shear ultrasonic waves, which have been measured between 10 and 300 K, show a steplike increase at about 200 K on cooling and a similar decrease at about 225 K during warming with hysteresis in the range 190--235 K, features previously observed in less dense ceramics and tentatively attributed to a phase transformation.
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 5002134
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 46:2; ISSN 0163-1829; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ACOUSTIC TESTING
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELASTICITY
HIGH-TC SUPERCONDUCTORS
MATERIALS TESTING
MECHANICAL PROPERTIES
NONDESTRUCTIVE TESTING
OXIDES
OXYGEN COMPOUNDS
PRESSURE DEPENDENCE
SUPERCONDUCTORS
TENSILE PROPERTIES
TESTING
TRANSITION ELEMENT COMPOUNDS
ULTRASONIC TESTING
YTTRIUM COMPOUNDS
YTTRIUM OXIDES