Optical properties of the Na2O–B2O3–Bi2O3–MoO3 glasses

Broadband near-infrared emission in Er3+–Tm3+ co-doped bismuthate glasses

“…Bismuthate glasses have important advantages for optical (including structure) and electrical properties over other common oxide glasses [11][12][13][14][15]. Our previous work indicated that bismuthate glass (Bi 2 O 3 -GeO 2 -Na 2 O) has a phonon energy of ∼440 cm −1 , which is significantly lower than both silicates and tellurites [12], and comparable to chalcogenides [16].…”

Structure and dielectric constant of silver molybdophosphate mixed network former glasses

“…Studies of few mixed former glass systems containing phosphate, molybdate, etc. with other glass network formers have been reported [16][17][18][19][20].…”

Ultrasonic investigations of some bismuth borate glasses doped with Al2O3

“…As BiO 6 , which act as a network modifier, converts BO 4 into BO 3 and creates NBOs, the dimensionality decreased as a direct result from the decrease of the dissociation energy of the studied glasses, as the bond strength of Bi-O is lower than that of B-O. [16][17][18][19][20] As mentioned before, the addition of Bi 2 O 3 in glass interstices causes a breaking in the network B-O-B bonds, and an increase in the molar volume. Thus, the glass structure will be less compacted.…”

“…The increase in density is also consistent with a previous work on the bismuth borate glass system. [16][17][18][19]21 Recent studies 8,[15][16][17][18][19][20][21][22] have shown that progressive addition of Bi 2 O 3 introduces extra-networkformer units. Such units change the crosslink density and the co-ordination numbers of Bi 3+ ions by the creation of Bi-O-B bonds that condense the structure more.…”

“…Also, this decrease may be due to the disruption of the network structure by introducing weaker bonds, as a result of changing the kind of the former from B 2 O 3 to Bi 2 O 3 . 9,10, [15][16][17][18][19][20][21][22]26 In a study of the elastic constants of materials using ultrasonic methods, the main point to note is the propagation of the ultrasonic wave velocity and the density. From the data for the ultrasonic wave propagation velocity mode, the series of elastic constants can be determined.…”