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Determination of oxygen content and carbonate impurity in YBa2Cu3O7−x by diffuse reflectance infrared spectroscopy (1991)

Merzbacher, C. I. ; Bonner, B. P.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 69 (1991), S. 4442-4444

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: Samples of YBa2Cu3O7−x with x ranging from ∼0 to 0.65 have been analyzed by diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) in the midinfrared region (400–6000 cm−1). Spectral line shapes vary gradually as a function of oxygen stoichiometry, and the reflectance at 400 and 1000 cm−1 decreases linearly with decreasing oxygen content. Spectra of samples that were incompletely synthesized or exposed to a 4% CO2 atmosphere at 650 °C clearly indicated the presence of carbonate. DRIFTS is therefore a quick, nondestructive method for determining oxygen content in YBa2Cu3O7−x powders, and for detecting carbonate species due to synthesis error or reaction with CO2-bearing atmosphere.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.348374

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V p /V s in saturated granodiorite loaded to failure (1975)

Bonner, B. P.

Springer

Pure and applied geophysics 113 (1975), S. 25-29

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ISSN: 1420-9136

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences , Physics

Notes: Summary Ultrasonic compressional and shear travel times have been measured simultaneously along the direction of maximum compression for granodiorite loaded in uniaxial stress. Excess pore fluid (kerosene) is available during the deformations which are performed under light confinement (2.5 MPa) at an average strain rate of about 5×10−6 s−1.V p /V s increases monotonically with shear stress (∼13%) until failure. These data are consistent with either: 1) a high rate of fluid flow of the same order as the increase in dilatant volume with time; or 2) an increase in total porosity with a decrease in mean aspect ratio of the pores (MPa=106 N/m2-10 bars).