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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 Velocity Studies on Superconducting and Non- Superconducting ErBa2Cu3O7-δ
Author(s): R. Abd-Shukor, S.S. Lee, and M. Yahya
Publication: Physica C Volume: 243 Issue: Not Available Year: 1995 Page(s): 134-138
Editor(s): Not Available
Publisher: Elsevier Science Publishers B.V.
Language: English
Notes: Not Available
Keywords: Material Specification, Density (mass), Crystallography, Critical Temperature, Debye Temperature, Shear Modulus, Sound Velocity

Materials and Properties

Er:123; [Er-Ba-Cu-O]
Material Specification for Er:123; [Er-Ba-Cu-O] Process:
Notes: "Samples were prepared by mixing appropriate amounts of Er2O3, BaCO3 and CuO with starting composition ErBa2Cu3O7-δ. The superconducting sample was prepared by heating the mixture for 24 h at 930 °C with several intermittent grindings and oven cooled. The powders were then pressed into pellets with approximately 13 mm diameter and 3 mm thick and heated at 930 °C in air for another 24 h. In order to detect ultrasonic echoes, samples have to be of substantially high density. It was found that by regrinding and repressing the samples several times the density increased significantly. ... The X-ray powder diffraction patterns... indicate that... samples are single-phase ErBa2Cu3O7-δ."
Formula: ErBa2Cu3O<6.92>
Informal Name: Er:123
Chemical Family: Er-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 Er:123; [Er-Ba-Cu-O]
Microstructure Condition () Density (g cm-3)
porous 6.19
void-free 7.12
Measurement Method: Unknow density method

Cautions: Unevaluated Data
No measurement details were noted.
Crystallography for Er:123; [Er-Ba-Cu-O]
Crystal System: Orthorhombic
Formula Units per Cell:
Space Group: Pmmm
Cell Parameters
Temp K a Å b Å c Å
296 3.821 3.888 11.669
Measurement Method: X-ray diffraction
"The samples were also examined by X-ray powder diffraction with CuKα radiation using a Siemens D 5000 diffractometer." No additional measurement details were noted.

Cautions: Unevaluated Data
Critical Temperature for Er:123; [Er-Ba-Cu-O]
Critical Temperature (K)
90
Measurement Method: Four-probe method
"The DC electrical resistance versus temperature measurements were carried out using the four-point probe method with silver paste contacts." No additional measurement details were noted.

Cautions: Evaluated Data
Debye Temperature for Er:123; [Er-Ba-Cu-O]
Microstructure Condition () Temperature (K) Debye Temperature (K)
porous 80 450
void-free 80 480
Measurement Method: Ultrasonic pulse-echo
"A Matec ultrasonic system model 7700, which utilize the pulse-echo-overlap technique with an accuracy of 10 ppm was used along with a single transducer set up. Y-cut and X-cut quartz transducers with a nominal fundamental frequency of 10 MHz were used to generate the shear and longitudinal ultrasonic waves respectively. Nonaq stopcock grease was used to bond the transducer to the sample. The temperature dependence measurements were performed using an Oxford Instrument Cryostat model DN 1711. The temperature was changed at a rate of about 0.5 K/min during cooling and warming."

Cautions: Evaluated Data
Shear Modulus for Er:123; [Er-Ba-Cu-O]
Microstructure Condition () Temperature (K) Shear Modulus (GPa)
porous 80 45.7
void-free 80 52.4
Measurement Method: Ultrasonic pulse-echo
"A Matec ultrasonic system model 7700, which utilize the pulse-echo-overlap technique with an accuracy of 10 ppm was used along with a single transducer set up. Y-cut and X-cut quartz transducers with a nominal fundamental frequency of 10 MHz were used to generate the shear and longitudinal ultrasonic waves respectively. Nonaq stopcock grease was used to bond the transducer to the sample. The temperature dependence measurements were performed using an Oxford Instrument Cryostat model DN 1711. The temperature was changed at a rate of about 0.5 K/min during cooling and warming."

Cautions: Evaluated Data
Sound Velocity for Er:123; [Er-Ba-Cu-O]
Microstructure Condition () Mode () Temperature (K) Sound Velocity (km/s)
porous Longitudinal 80 5.149
void-free Longitudinal 80 5.909
porous Shear 80 2.719
void-free Shear 80 2.909
void-free Shear 86 2.896
void-free Shear 100 2.894
void-free Shear 120 2.892
void-free Shear 140 2.886
void-free Shear 160 2.880
void-free Shear 165 2.877
void-free Shear 182 2.875
void-free Shear 192 2.865
void-free Shear 197 2.857
void-free Shear 200 2.856
void-free Shear 201 2.853
void-free Shear 206 2.849
void-free Shear 211 2.847
Measurement Method: Ultrasonic pulse-echo
"A Matec ultrasonic system model 7700, which utilize the pulse-echo-overlap technique with an accuracy of 10 ppm was used along with a single transducer set up. Y-cut and X-cut quartz transducers with a nominal fundamental frequency of 10 MHz were used to generate the shear and longitudinal ultrasonic waves respectively. Nonaq stopcock grease was used to bond the transducer to the sample. The temperature dependence measurements were performed using an Oxford Instrument Cryostat model DN 1711. The temperature was changed at a rate of about 0.5 K/min during cooling and warming."

Cautions: Evaluated Data
Digitized data were obtained from Figure 4 of the paper.