Optical Absorption of Cuprous Oxide

1961 ◽  
Vol 121 (2) ◽  
pp. 359-362 ◽  
Author(s):  
Philip W. Baumeister
Keyword(s):  
Optical Absorption ◽  
Cuprous Oxide

Photoluminescence and optical absorption studies of the effects of heat treatment on cuprous oxide

1983 ◽  
Vol 61 (10) ◽  
pp. 1423-1427 ◽  
Author(s):  
C. K. Teh ◽  
F. L. Weichman
Keyword(s):  
Optical Absorption ◽  
Cuprous Oxide ◽  
Oxygen Vacancies ◽  
Short Wave ◽  
Luminescent Intensity ◽  
Low Oxygen ◽  
Reducing Atmosphere ◽  
Absorption Studies ◽  
Different Types ◽  
Absorption Measurements

The defects responsible for the short-wave (720 nm) and medium-wave (820 nm) luminescence in cuprous oxide can be created by annealing the crystal at a temperature of 1050 °C under low oxygen pressures. The annihilation of these defects has been observed from the photoluminescence and optical absorption measurements after the crystal has been subjected to a second annealing in the temperature range of about 750 °C under a reducing atmosphere. From the photoluminescence measurements, the density of these defects is found to decrease exponentially as a function of annealing time, as manifested by the reduction in the luminescent intensity. The rate of reduction in intensity is also found to increase with annealing temperature.Because the defects responsible for the luminescence are ascribed to various forms of oxygen vacancies, we believe the decrease in luminescence is due to a reduction in the oxygen vacancies resulting from the formation of copper precipitates in the crystal. The short-wave and medium-wave emissions, which are ascribed to different types of oxygen vacancies, are found to have different activation energies of diffusion.

scholarly journals Photoelectrochemical evidence for saturated optical absorption in electrolytic cuprous oxide

1991 ◽  
Vol 58 (16) ◽  
pp. 1739-1741
Author(s):  
Daniel T. Schwartz ◽  
Rolf H. Muller
Keyword(s):  
Optical Absorption ◽  
Cuprous Oxide

Characterization of intergranular cuprous oxide in polycrystalline YBa2Cu3O7-x

1988 ◽  
Vol 46 ◽  
pp. 880-881
Author(s):  
Bradley L. Thiel ◽  
Chan Han R. P. ◽  
Kurosky L. C. Hutter ◽  
I. A. Aksay ◽  
Mehmet Sarikaya
Keyword(s):  
Grain Boundary ◽  
Cuprous Oxide ◽  
Room Temperature ◽  
Boundary Phase ◽  
Spectroscopic Techniques ◽  
Transition Width ◽  
Practical Applications ◽  
Thin Foils ◽  
Superconducting Oxides

The identification of extraneous phases is important in understanding of high Tc superconducting oxides. The spectroscopic techniques commonly used in determining the origin of superconductivity (such as RAMAN, XPS, AES, and EXAFS) are surface-sensitive. Hence a grain boundary phase several nanometers thick could produce irrelevant spectroscopic results and cause erroneous conclusions. The intergranular phases present a major technological consideration for practical applications. In this communication we report the identification of a Cu2O grain boundary phase which forms during the sintering of YBa2Cu3O7-x (1:2:3 compound).Samples are prepared using a mixture of Y2O3. CuO, and BaO2 powders dispersed in ethanol for complete mixing. The pellets pressed at 20,000 psi are heated to 950°C at a rate of 5°C per min, held for 1 hr, and cooled at 1°C per min to room temperature. The samples show a Tc of 91K with a transition width of 2K. In order to prevent damage, a low temperature stage is used in milling to prepare thin foils which are then observed, using a liquid nitrogen holder, in a Philips 430T at 300 kV.

Optical absorption in PdH

1982 ◽  
Vol 43 (2) ◽  
pp. 323-328 ◽  
Author(s):  
M.A. Khan ◽  
R. Riedinger
Keyword(s):  
Optical Absorption

IRREVERSIBLE PHOTOINDUCED CHANGE IN THE OPTICAL ABSORPTION OF YIG(Si) ON IRRADIATION

1971 ◽  
Vol 32 (C1) ◽  
pp. C1-794-C1-795
Author(s):  
J. F. DILLON ◽  
Jr ◽  
E. M. GYORGY ◽  
J. P. REMEIKA
Keyword(s):  
Optical Absorption ◽  
Photoinduced Change

OPTICAL ABSORPTION OF SOLID NEON AND ARGON IN THE SOFT X-RAY REGION

1971 ◽  
Vol 32 (C4) ◽  
pp. C4-236-C4-240 ◽  
Author(s):  
R. HAENSEL ◽  
G. KEITEL ◽  
N. KOSUCH ◽  
U. NIELSEN ◽  
P. SCHREIBER
Keyword(s):  
Optical Absorption ◽  
X Ray
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