Room‐temperature optical absorption in undoped α‐Al2O3

1990 ◽  
Vol 67 (12) ◽  
pp. 7542-7546 ◽  
Author(s):  
M. E. Innocenzi ◽  
R. T. Swimm ◽  
M. Bass ◽  
R. H. French ◽  
A. B. Villaverde ◽  
...  
Keyword(s):  
Optical Absorption ◽  
Room Temperature ◽  
Α Al2o3 ◽  
Room Temperature Optical Absorption

Room temperature optical absorption and intrinsic photoluminescence in KZnF3

2010 ◽  
Vol 494 (4-6) ◽  
pp. 284-286 ◽  
Author(s):  
Neetu Tyagi ◽  
P. Senthil Kumar ◽  
R. Nagarajan
Keyword(s):  
Optical Absorption ◽  
Room Temperature ◽  
Room Temperature Optical Absorption

Room-temperature optical absorption in the InAs/GaAs quantum-dot superlattice under an electric field

2011 ◽  
Vol 45 (8) ◽  
pp. 1064-1069 ◽  
Author(s):  
M. M. Sobolev ◽  
I. M. Gadzhiev ◽  
I. O. Bakshaev ◽  
V. N. Nevedomskii ◽  
M. S. Buyalo ◽  
...  
Keyword(s):  
Optical Absorption ◽  
Quantum Dot ◽  
Electric Field ◽  
Room Temperature ◽  
Gaas Quantum Dot ◽  
Room Temperature Optical Absorption

Direct Imaging of Room Temperature Optical Absorption with Subnanometer Spatial Resolution

Nano Letters ◽  
2010 ◽  
Vol 10 (12) ◽  
pp. 4897-4900 ◽  
Author(s):  
Gregory Scott ◽  
Sumit Ashtekar ◽  
Joseph Lyding ◽  
Martin Gruebele
Keyword(s):  
Optical Absorption ◽  
Spatial Resolution ◽  
Room Temperature ◽  
Direct Imaging ◽  
Room Temperature Optical Absorption

Energy gap values by optical absorption in I III IV Se4 compounds

1982 ◽  
Vol 60 (8) ◽  
pp. 1096-1100 ◽  
Author(s):  
R. G. Goodchild ◽  
O. H. Hughes ◽  
S. A. Lopez-Rivera ◽  
J. C. Woolley
Keyword(s):  
Optical Absorption ◽  
Room Temperature ◽  
Energy Gap ◽  
Quaternary Compounds ◽  
Room Temperature Optical Absorption ◽  
Absorption Measurements ◽  
Gap Values

Polycrystalline samples have been prepared of 12 defect chalcopyrite quaternary compounds of the form I III IV Se4, where I is Cu or Ag, III Al, Ga or In, and IV Ge or Sn. In all cases room temperature optical absorption measurements have been made to determine values of the fundamental energy gap (Eg) and all gaps shown to be direct. For the cases of AgGaSnSe4 and AgGaGeSe4, values of Eg have been determined as a function of temperature from helium to room and the data fitted to a Manoogian–Leclerc equation. The energy gap values of the quaternary compounds (EgT) have been compared with those of the corresponding ternary chalcopyrite compounds (EgT) and a relation between the values of EgQ−EgT and EgT shown.

Observation of room temperature optical absorption in InP/GaAs type-II ultrathin quantum wells and quantum dots

2014 ◽  
Vol 115 (22) ◽  
pp. 223505 ◽  
Author(s):  
S. D. Singh ◽  
S. Porwal ◽  
Puspen Mondal ◽  
A. K. Srivastava ◽  
C. Mukherjee ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Absorption ◽  
Quantum Wells ◽  
Room Temperature ◽  
Type Ii ◽  
Room Temperature Optical Absorption

Testing of colourless natural diamonds by room temperature optical absorption

1990 ◽  
Vol 22 (3) ◽  
pp. 142-145
Author(s):  
G. Lifante ◽  
F. Jaque ◽  
M. A. Hoyos ◽  
S. Leguey
Keyword(s):  
Optical Absorption ◽  
Room Temperature ◽  
Natural Diamonds ◽  
Room Temperature Optical Absorption

Preparation of High-Purity Ultrafine α-Al2O3 by Solid-State Reaction at Room Temperature

2008 ◽  
Vol 368-372 ◽  
pp. 683-685
Author(s):  
Cheng Wei Hao ◽  
Bo Lin Wu ◽  
Ji Yan Li
Keyword(s):  
Solid State ◽  
High Purity ◽  
Solid State Reaction ◽  
Room Temperature ◽  
Raw Materials ◽  
Phase Particle ◽  
Phase Transformation Temperature ◽  
Particle Size And Morphology ◽  
Size And Morphology ◽  
Α Al2o3

Ammonium aluminium carbonate hydroxide (AACH), with a small quantity of γ-AlOOH, was synthesized through solid-state reaction at room temperature using AlCl3·6H2O and NH4HCO3 as raw materials and polyethylene glycol (PEG-10000) as the dispersant. After calcined at 1100°C for 1.5h, α-Al2O3 powders with primary particle sizes of 20~30nm were obtained. The crystal phase, particle size and morphology of the high-purity ultrafine α-Al2O3 were characterized. The results showed that a small quantity of γ-AlOOH in the AACH decomposed and formed crystal seeds. The presence of crystal seeds reduced the nucleation activation energy and therefore reduced the phase transformation temperature.

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