Optical absorption in cobalt-containing single-crystal epitaxial films of gadolinium gallium garnets

2003 ◽  
Vol 45 (2) ◽  
pp. 253-258 ◽  
Author(s):  
V. V. Randoshkin ◽  
N. V. Vasil’eva ◽  
V. G. Plotnichenko ◽  
Yu. N. Pyrkov ◽  
A. M. Saletskii ◽  
...  
Keyword(s):  
Optical Absorption ◽  
Single Crystal ◽  
Epitaxial Films

Optical absorption by Nd3+ and Gd3+ ions in epitaxial films grown on Gd3Ga5O12 substrates from a lead-containing solution melt

2004 ◽  
Vol 46 (6) ◽  
pp. 1030-1036 ◽  
Author(s):  
V. V. Randoshkin ◽  
N. V. Vasil’eva ◽  
V. G. Plotnichenko ◽  
Yu. N. Pyrkov ◽  
S. V. Lavrishchev ◽  
...  
Keyword(s):  
Optical Absorption ◽  
Epitaxial Films

Optical Absorption of CuInSe2 in Bulk Single Crystal

1981 ◽  
Vol 108 (1) ◽  
pp. K19-K22 ◽  
Author(s):  
C. Rincón ◽  
J. González ◽  
G. Sanchez Perez
Keyword(s):  
Optical Absorption ◽  
Single Crystal ◽  
Bulk Single Crystal

H-bonding scheme in allactite: a combined single-crystal X-ray and neutron diffraction, optical absorption spectroscopy, FTIR and EPMA-WDS study

2016 ◽  
Vol 80 (5) ◽  
pp. 719-732 ◽  
Author(s):  
G. Diego Gatta ◽  
Ferdinando Bosi ◽  
Maria Teresa Fernandez Diaz ◽  
Ulf Hålenius
Keyword(s):  
Neutron Diffraction ◽  
Optical Absorption ◽  
Single Crystal ◽  
Absorption Spectroscopy ◽  
Structure Refinement ◽  
Site Occupancy ◽  
Optical Absorption Spectroscopy ◽  
Hydroxyl Groups ◽  
X Ray ◽  
Bonding Scheme

AbsatractThe crystal chemistry of allactite from Långban, Värmland (Sweden) was investigated by single-crystal X-ray and neutron diffraction, optical absorption spectroscopy, Fourier-transform infra-red spectroscopy (FTIR) and electron microprobe analysis by wavelength-dispersive spectroscopy (EPMA-WDS). The optical spectra indicate the presence of Mn in valence state 2+ only. Assuming 16 O atoms per formula unit, arsenic as As5+and the (OH) content calculated by charge balance, the resulting formula based on the EPMA-WDS data is (Mn2+6.73Ca0.13Mg0.12Zn0.02)∑7.00(As5+)2.00O16H8, very close to the ideal composition Mn7(AsO4)2(OH)8. In the unpolarized FTIR spectrum of allactite, fundamental (OH)-stretching bands are observed at 3236, 3288, 3387, 3446, 3484, 3562 and 3570 cm–1, suggesting that a number of OH environments, with different hydrogen bond strengths, occur in the structure. The neutron structure refinement shows that four independent H sites occur in allactite with full site occupancy, all as members of hydroxyl groups. The complex hydrogen-bonding scheme in the allactite structure is now well defined, with at least nine hydrogen bonds energetically favourable with mono-, bi- and trifurcated configurations.

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