Synthesis and photoluminescent properties of SnO-containing germanate and germanosilicate glasses
A. I. ChernovB. I. DenkerР. П. ЕрмаковB. I. GalaganL. D. IskhakovaS. E. SverchkovVladimir V. VelmiskinEvgenii M Dianov
6
Citation
5
Reference
10
Related Paper
Citation Trend
Keywords:
Germanate
Silicate glass
Silicate glasses show a wide range of responses to exposure to water or steam at high temperatures and pressure. The response patterns and the factors determining these patterns are discussed. The manner in which water is incorporated in the silicate glasses is elucidated by a study of the near infrared spectra and differential thermogravimetric analysis of hydrated glasses. Factors affecting relative amounts of tightly bonded and loosely bonded water are discussed.
Silicate glass
Thermogravimetric analysis
Differential thermal analysis
Cite
Citations (77)
Germanate
Ilmenite
Cite
Citations (5)
Germanate
Cite
Citations (0)
XANES
Coordination number
Cite
Citations (156)
The two‐point bend strength and the fracture toughness of a series of soda–potassia–silicate and soda–potassia–calcia–silicate glass fibres have been measured. There is a clear variation of mean strength with composition for the soda–potassia–silicate glasses, however, there is much less variation of mean strength with composition for the soda–potassia–calcia–silicate glasses. There is also a greater variation of fracture toughness with composition for the soda–potassia–silicate glasses than for the soda–potassia–calcia–silicate glasses. The mean strength, fracture toughness and inferred flaw sizes for the soda–potassia–calcia–silicate glasses are all less than the equivalent values for the soda–potassia–silicate glasses. These results are related to the structural models and durability of the glasses tested.
Silicate glass
Cite
Citations (8)
Silicate glass
Cite
Citations (0)
Bismuth germanate
Germanate
Bismuth
Silicate glass
Cite
Citations (2)
Glass compositions are correlated with published data for refractive index, specific volume, and fluidity, which indicate the presence of different structural types in silicate glasses. These structural types are shown to be uniquely related to the composition areas of primary crystallization phase fields. It is suggested that these different structural types are to be understood as silicate framework structures or “substructures” in which other appropriate cations may be accommodated. The described data relations definitely establish the presence of different recognizable substructures in silicate glasses but do not permit judgments on their detailed characteristics.
Silicate glass
Cite
Citations (31)
Abstract A new silicate-germanate K 2 Y[(Si 3 Ge)O 10 (OH)] was synthesized hydrothermally in a system Y 2 O 3 :GeO 2 :SiO 2 = 1:1:2 (T = 280 °C; P = 90–100 atm.); K 2 CO 3 was added to the solution as a mineralizer. Single-crystal X-ray diffraction experiment was carried out at low temperature (150 K). The unit cell parameters are a = 10.4975(4), b = 6.9567(2), c = 15.4001(6) Å, β = 104.894(4)°; V = 1086.86(7) Å 3 ; space group is P 2 1 / c . A novel complex anion is presented by corrugated (Si,Ge) tetrahedral layers connected by couples of YO 6 octahedra into the mixed microporous framework with the channels along b and a axes, the maximal size of cross-section is ~5.6 Å. This structure has similarity with the two minerals: ring silicate gerenite (Ca,Na) 2 (Y,REE) 3 Si 6 O 18 · 2H 2 O and chain silicate chkalovite Na 2 BeSi 2 O 6 . Six-member rings with 1̅ symmetry as in gerenite are distinguished in the new layer. They are mutually perpendicular to each other and connected by additional tetrahedra. Straight crossing chains in chkalovite change to zigzag four-link chains in the new silicate-germanate layer.
Germanate
Cite
Citations (0)
Summary A number of new alkaline-earth-rare-earth silicate and germanate compounds with the apatite-type structure have been synthesized including a new calcium lanthanum silicate, Ca 4 La 6 (SiO 4 ) 6 (OH) 2 , which has a 9·63 Å, c 7·12, and c/a 0·740. This has a random distribution of Ca 2+ and La 3+ over the (4f) and (6h) sites in the lattice. X-ray data are given for Ca 4 La 6 (SiO 4 ) 6 (OH) 2 together with cell dimensions for other synthetic silicate and germanate apatites. Silicate apatites with partially occupied or vacant halogen (2a) sites analogous to those of the pyro- morphites have been prepared, and a classification for silicate apatites based on synthetic end-members is proposed.
Germanate
Lanthanum
Alkaline earth metal
Calcium silicate
Cite
Citations (43)