Hts Logo

NIST High Temp. Superconducting Materials (HTS) Database:

NIST Standard Reference Database 62

Last Update to Data Content: 1996

DOI: https://doi.org/10.18434/T4KP8J

Bibliographic Information

Title: Ultrasonic Measurements on Two Single-Phase Polycrystalline YBa2Cu4O8 Superconducting Samples
Author(s): W. Ting, K. Fossheim, T. Wada, Y. Yaegashi, H. Yamauchi, and S. Tanaka
Publication: Physical Review B Volume: 47 Issue: 18 Year: 1993 Page(s): 12197-12204
Editor(s): Not Available
Publisher: American Physical Society
Language: English
Notes: Not Available
Keywords: Material Specification, Density (mass), Critical Temperature, Debye Temperature, Elastic Modulus, Shear Modulus, Bulk Modulus, Sound Velocity

Materials and Properties

Y:124; [Y-Ba-Cu-O]
Material Specification for Y:124; [Y-Ba-Cu-O] Process: Solid State Reaction
Notes: The authors cite W. Ting, Physica C, Vol. 185-189, 1393 (1991), and summarize the procedure as follows. "Two polycrystalline Y 1:2:4 samples were used in this study... X-ray measurements showed that both specimens are single phase without any trace of Y 1:2:3 or the Y2Ba4Cu7O15-y phase."
Formula: YBa2Cu4O8
Informal Name: Y:124
Chemical Family: Y-Ba-Cu-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:

Density (mass) for Y:124; [Y-Ba-Cu-O]
Temperature (K) Density (g cm-3)
296 3.97
Measurement Method: Mass density

Cautions: Unevaluated Data
No measurement details were noted.
Critical Temperature for Y:124; [Y-Ba-Cu-O]
Critical Temperature (K)
76
Measurement Method: Ac susceptibility

Cautions: Unevaluated Data
No measurement details were noted.
Debye Temperature for Y:124; [Y-Ba-Cu-O]
Temperature (K) Debye Temperature (K)
296 364
Measurement Method: Ultrasonic method
"A 36° Y-cut or 41° X-cut lithium niobate overtone polished transducer was bonded to one of the two parallel ends of the sample by Nonaq Stopcock grease. Standard Matec equipment and an automatic time-of-flight technique were employed in the studies. For both compressional and shear-wave measurements, at least four distinct, well-separated echo signals were visible over the whole temperature range. As the temperature is lowered, more reflection signals always appear. Both ultrasonic velocity and attenuation were recorded during cooling and heating. Temperature was regulated to within 0.5 mK of the set value. A change of 50 ppm in velocity could be detected."

Cautions: Evaluated Data
Elastic Modulus for Y:124; [Y-Ba-Cu-O]
Temperature (K) Elastic Modulus (GPa)
296 31.8
Measurement Method: Ultrasonic method
"A 36° Y-cut or 41° X-cut lithium niobate overtone polished transducer was bonded to one of the two parallel ends of the sample by Nonaq Stopcock grease. Standard Matec equipment and an automatic time-of-flight technique were employed in the studies. For both compressional and shear-wave measurements, at least four distinct, well-separated echo signals were visible over the whole temperature range. As the temperature is lowered, more reflection signals always appear. Both ultrasonic velocity and attenuation were recorded during cooling and heating. Temperature was regulated to within 0.5 mK of the set value. A change of 50 ppm in velocity could be detected."

Cautions: Evaluated Data
Shear Modulus for Y:124; [Y-Ba-Cu-O]
Temperature (K) Shear Modulus (GPa)
296 12.9
Measurement Method: Ultrasonic method
"A 36° Y-cut or 41° X-cut lithium niobate overtone polished transducer was bonded to one of the two parallel ends of the sample by Nonaq Stopcock grease. Standard Matec equipment and an automatic time-of-flight technique were employed in the studies. For both compressional and shear-wave measurements, at least four distinct, well-separated echo signals were visible over the whole temperature range. As the temperature is lowered, more reflection signals always appear. Both ultrasonic velocity and attenuation were recorded during cooling and heating. Temperature was regulated to within 0.5 mK of the set value. A change of 50 ppm in velocity could be detected."

Cautions: Evaluated Data
Bulk Modulus for Y:124; [Y-Ba-Cu-O]
Temperature (K) Bulk Modulus (GPa)
296 19.7
Measurement Method: Ultrasonic method
"A 36° Y-cut or 41° X-cut lithium niobate overtone polished transducer was bonded to one of the two parallel ends of the sample by Nonaq Stopcock grease. Standard Matec equipment and an automatic time-of-flight technique were employed in the studies. For both compressional and shear-wave measurements, at least four distinct, well-separated echo signals were visible over the whole temperature range. As the temperature is lowered, more reflection signals always appear. Both ultrasonic velocity and attenuation were recorded during cooling and heating. Temperature was regulated to within 0.5 mK of the set value. A change of 50 ppm in velocity could be detected."

Cautions: Evaluated Data
Sound Velocity for Y:124; [Y-Ba-Cu-O]
Mode () Temperature (K) Sound Velocity (km/s)
Longitudinal 296 3.0483
Transverse 296 1.8024
Measurement Method: Ultrasonic method
"A 36° Y-cut or 41° X-cut lithium niobate overtone polished transducer was bonded to one of the two parallel ends of the sample by Nonaq Stopcock grease. Standard Matec equipment and an automatic time-of-flight technique were employed in the studies. For both compressional and shear-wave measurements, at least four distinct, well-separated echo signals were visible over the whole temperature range. As the temperature is lowered, more reflection signals always appear. Both ultrasonic velocity and attenuation were recorded during cooling and heating. Temperature was regulated to within 0.5 mK of the set value. A change of 50 ppm in velocity could be detected."

Cautions: Evaluated Data