germanium and barium-oxide

germanium has been researched along with barium-oxide* in 2 studies

Other Studies

2 other study(ies) available for germanium and barium-oxide

Article	Year
Ab initio calculation of vibrational frequencies and Raman spectra of barium peroxide glass including comparison of tetrahedral BaO4 with GeO4 and SiO4. Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, 2011, Volume: 79, Issue:5 We have calculated the vibrational frequencies of clusters of atoms from the first principles by using the density-functional theory in the local density approximation (LDA). We are also able to calculate the electronic binding energy for all of the clusters of atoms from the optimized structure. We have made clusters of BanOm (n, m=1-6) and have determined the bond lengths, vibrational frequencies as well as intensities in each case. We find that the peroxide cluster BaO2 occurs with the O-O vibrational frequency of 836.3 cm(-1). We also find that a glass network occurs in the material which explains the vibrational frequency of 67 cm(-1). The calculated values agree with those measured from the Raman spectra of barium peroxide and Ba-B-oxide glass. We have calculated the vibrational frequencies of BaO4, GeO4 and SiO4 each in tetrahedral configuration and find that the vibrational frequencies in these systems depend on the inverse square root of the atomic mass. Topics: Barium Compounds; Germanium; Mathematical Computing; Oxides; Silicon Compounds; Silicon Dioxide; Spectrum Analysis, Raman; Vibration	2011
The near-infrared broadband emission from bismuth-doped GeO2-WO3 and GeO2-BaO glasses. Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, 2008, Volume: 70, Issue:1 Glasses with the composition of (99.5-chi)GeO2-chiWO(3)-0.5Bi2O3 (chi=3, 6, 9 mol%) and (99.5-psi)GeO2-psiBaO-0.5Bi2O3 (psi=3, 6, 9 mol%) were prepared. Their thermal, emission and absorption measurements were carried out. The near-infrared super broadband emission of the prepared samples peak around 1.3 microm was discovered. The results indicated, in GeO2-WO3-Bi2O3 glasses, increasing amount of WO3 brought about the broadening of FWHM, prolonging of lifetime and enhancing of thermal stabilities. While in GeO2-BaO-Bi2O3 glasses, concomitant with the increasing amount of BaO were the broadened FWHM as well as the prolonged lifetime. Red-shift tendency of absorption edges was discovered in both two groups of glasses indicating the Bi5+ ions might take responsibility for the broadband emission. Topics: Barium Compounds; Bismuth; Germanium; Glass; Hot Temperature; Oxides; Spectrophotometry, Infrared; Time Factors; Tungsten	2008

Article

Year

Ab initio calculation of vibrational frequencies and Raman spectra of barium peroxide glass including comparison of tetrahedral BaO4 with GeO4 and SiO4.

Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, 2011, Volume: 79, Issue:5

We have calculated the vibrational frequencies of clusters of atoms from the first principles by using the density-functional theory in the local density approximation (LDA). We are also able to calculate the electronic binding energy for all of the clusters of atoms from the optimized structure. We have made clusters of BanOm (n, m=1-6) and have determined the bond lengths, vibrational frequencies as well as intensities in each case. We find that the peroxide cluster BaO2 occurs with the O-O vibrational frequency of 836.3 cm(-1). We also find that a glass network occurs in the material which explains the vibrational frequency of 67 cm(-1). The calculated values agree with those measured from the Raman spectra of barium peroxide and Ba-B-oxide glass. We have calculated the vibrational frequencies of BaO4, GeO4 and SiO4 each in tetrahedral configuration and find that the vibrational frequencies in these systems depend on the inverse square root of the atomic mass.

Topics: Barium Compounds; Germanium; Mathematical Computing; Oxides; Silicon Compounds; Silicon Dioxide; Spectrum Analysis, Raman; Vibration

2011

The near-infrared broadband emission from bismuth-doped GeO2-WO3 and GeO2-BaO glasses.

Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, 2008, Volume: 70, Issue:1

Glasses with the composition of (99.5-chi)GeO2-chiWO(3)-0.5Bi2O3 (chi=3, 6, 9 mol%) and (99.5-psi)GeO2-psiBaO-0.5Bi2O3 (psi=3, 6, 9 mol%) were prepared. Their thermal, emission and absorption measurements were carried out. The near-infrared super broadband emission of the prepared samples peak around 1.3 microm was discovered. The results indicated, in GeO2-WO3-Bi2O3 glasses, increasing amount of WO3 brought about the broadening of FWHM, prolonging of lifetime and enhancing of thermal stabilities. While in GeO2-BaO-Bi2O3 glasses, concomitant with the increasing amount of BaO were the broadened FWHM as well as the prolonged lifetime. Red-shift tendency of absorption edges was discovered in both two groups of glasses indicating the Bi5+ ions might take responsibility for the broadband emission.

Topics: Barium Compounds; Bismuth; Germanium; Glass; Hot Temperature; Oxides; Spectrophotometry, Infrared; Time Factors; Tungsten

2008