Optical absorption of cerium phosphate glasses

Harani, Ravishankar; Hogarth, C. A.

doi:10.1007/bf00719728

Cited by 20 publications

(6 citation statements)

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“…Interestingly, in the absence of silica, the durability of binary cerium phosphate glasses synthesized using open-crucible techniques is improved. However, they exhibit a UV-Vis absorption edge between 350 and 400 nm, and strong yellow coloration [13][14][15]. Clearly, the addition of silica plays a role in both the optical absorption and durability of cerium phosphate glasses.…”

Section: Introductionmentioning

confidence: 98%

Synthesis and properties of cerium aluminosilicophosphate glasses

Rygel

Pantano

2009

Journal of Non-Crystalline Solids

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Section: Introductionmentioning

confidence: 98%

Synthesis and properties of cerium aluminosilicophosphate glasses

Rygel

Pantano

2009

Journal of Non-Crystalline Solids

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“…One possible reason suggested by them is that the slope of the observed exponential edges obtained from Equation 2 are very much the same as in many semiconductors, and the values of Ee for a range of amorphous semiconductors lie between about 0.045 and 0.67 eV. For cerium phosphate glasses [11], the value ofE e was as low as 0.03 eV. Fig.…”

Section: Optical Absorption Spectroscopymentioning

confidence: 90%

“…However, an absorption at 850 nm due to Cu 2 § is observed for copper phosphate glass (Curve 1) [4,16] and this disappears as the glass is increasingly doped with Pr60 H . It is clear that the fundamental optical absorption edge of glass doped with Pr6Ojl is sharp as for cerium phosphate glass [11] rather than the usual copper phosphate glass, but it is not as sharp as reported for the higher percentages of Pr6Oit in praseodymium phosphate glasses [13].…”

Section: Optical Absorption Spectroscopymentioning

confidence: 97%

“…Many of the investigations of electronically-conducting oxide glasses have been made in glass systems based on phosphorus pentoxide [2][3][4]. Spectroscopic studies of lanthanide salts have been reported [5,6] and traditional glasses doped with varying quantities of rareearth oxides have been investigated [7][8][9][10][11]. In such systems lanthanide ions may give rise to sharp absorption bands.…”

Section: Introductionmentioning

confidence: 99%

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Some studies of the optical properties of copper phosphate glasses containing praseodymium

1986

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A range of copper phosphate glasses containing praseodymium was prepared and the optical absorption edges and infrared optical absorption spectra were measured. The optical energy gap of copper phosphate glass doped with praseodymium is slightly higher than the corresponding composition of the base glass. Heat treatment at 400 and 800~ caused some changes in the infrared absorption bands which are related to the characteristics of the Pr6Oll component.

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Optical absorption in praseodymium germanate glass

et al. 1986

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The optical absorption of binary praseodymium and cerium phosphate glasses has recently been reported [1][2][3]. In such materials, including a significant content of lanthanide oxide, the fundamental absorption edge is sharp, much more like crystalline than the usual glassy materials. The sharp absorption peaks at 445, 468, 479 and 589 nm are due to relevant transitions between 3H 4 --+ 3P2, 3H 4 --~ 3p1, 3H 4 ~ 3P 0 and 3H 4 ---* 1D 2. The behaviour of rare earth ions in glasses is similar to that of rare earths in inorganic crystals of low symmetry. This different spectral behaviour, that is shown by ions of the d-block transition elements, lies in the fact that the 4f orbitals penetrate well in towards the nucleus and the 4f electrons are therefore well shielded by the outer 5s and 5p electrons. Consequently their energies and the energies of the f -f transitions are only little affected by the external fields. The visible spectra due to such transitions, therefore, are both sharp and almost independent of the medium in which the ions are immersed.Reisfeld [4] proposed that the rare earth ion in glass occupies the centre of a distorted cube which is made of four tetrahedra of borate, phosphate, silicate or germanate whichever system is being considered, and each tetrahedron contributes two oxygens to the coordination of the rare earth ions. The overall coordination number is 8, the most common coordination of rare earth oxides.In the present letter we report the optical absorption of praseodymium germanate glass, a material whose properties have not previously been reported in the literature.The binary 5 mol % Pr6On-95 mol % GeO2 glasses were prepared from analytical reagent grades of Pr60 u and GeO2 in 20 g batches, melted in an alumina crucible at 1530°C for 3 h. Homogeneity of the melt was ensured by stirring with an alumina rod from time to time. The melt was quenched by pouring into a disc-shaped depression in a steel plate. The glass samples were annealed at 300°C for 1 h to relieve mechanical stress.The optical absorption measurements were made using a Perkin-Elmer Lambda-3 spectrophotometer in the wavelength range 200 to 900 nm and a sample o f polished glass 0.74mm thick.The Pr 3+ ion has a normal electronic configuration 4s 2, 4p 6, 4d 1°, 4f 2, 5s 2, 5p 6, and a ground state 3H4 with a well-defined value of total angular momentum J = 4. Fig. 1 shows the optical absorption as a function of wavelength for praseodymium germanate glass and it is clear that the fundamental optical absorption edge is sharp, much more like crystalline than the usual glassy materials, as observed earlier in praseodymium phosphate [1] and cerium phosphate glasses

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Optical absorption of cerium phosphate glasses

Cited by 20 publications

References 11 publications

Synthesis and properties of cerium aluminosilicophosphate glasses

Synthesis and properties of cerium aluminosilicophosphate glasses

Some studies of the optical properties of copper phosphate glasses containing praseodymium

Optical absorption in praseodymium germanate glass

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