Lithium metasilicate
| Catalog Number | ACM10102246-1 |
|---|---|
| CAS Number | 10102-24-6 |
| Structure |  |
| Synonyms | Dilithium Oxosilanediolate, Dilithium metasilicate |
| IUPAC Name | dilithium;dioxido(oxo)silane |
| Molecular Weight | 89.89 |
| Molecular Formula | Li2O3Si |
| Canonical SMILES | [Li+].[Li+].[O-][Si](=O)[O-] |
| InChI | InChI=1S/2Li.O3Si/c;;1-4(2)3/q2*+1;-2 |
| InChI Key | PAZHGORSDKKUPI-UHFFFAOYSA-N |
| Melting Point | 1204ºC |
| Purity | 96% |
| Density | 2.52 g/cm³ |
| Appearance | White solid |
| Storage | Storage conditions: Keep container tightly closed. |
| Complexity | 18.8 |
| Exact Mass | 89.993677g/mol |
| Formal Charge | 0 |
| Heavy Atom Count | 6 |
| Monoisotopic Mass | 89.993677g/mol |
| Rotatable Bond Count | 0 |
Study on Optical Properties of Lithium Metasilicate
Alemi, Abdolali, et al. International nano letters 3 (2013): 1-11.
The UV-visible and photoluminescence spectra of hydrothermally synthesized crystalline lithium metasilicate (Li2SiO3) and lithium disilicate (Li2Si2O5) nanomaterials were studied. The band intensity in the emission spectra of both compounds increased with increasing reaction time. The electronic band structure and density of states calculated by density functional theory (DFT) method showed that the indirect band gaps of Li2SiO3 and Li2Si2O5 were 4.575 and 4.776 eV, respectively. The optical properties of the compounds, including dielectric, absorption, reflectivity, and energy loss spectra, were calculated by DFT method and analyzed according to the electronic structure.
The electronic band structure as well as the density of states (DOS) of the compounds were calculated by density functional theory (DFT) using one of three nonlocal gradient corrected exchange-correlation functionals. The calculations were performed using the CASTEP code, which uses a plane wave basis set for valence electrons and a norm-conserving pseudopotential for core electrons. The number of plane waves included in the basis was determined by a cutoff energy Ec of 500.0 eV. The summation of the Brillouin zones was performed by k-point sampling using a Monkhorst-Pack mesh with parameters of 5 × 5 × 5 for Li2SiO3 and 4 × 5 × 2 for Li2Si2O5. Pseudo-atomistic calculations were performed for Li-2s2, Si-3s2 3p2, and O-2s2 2p4. The parameters and convergence criteria used in the calculations were set by the default values of the CASTEP code, e.g., reciprocal space pseudopotential representation, intrinsic energy convergence tolerance of 1×10eV, Gaussian smearing scheme with a smear width of 0.1 eV, and Fermi energy convergence tolerance of 1×10eV.
Study of lithium metasilicate as a dental glass-ceramic
Soares, Viviane O., et al. Ceramics International 47.2 (2021): 2793-2801.
Glass-ceramics are widely used in dentistry due to their excellent properties: biocompatibility, chemical inertness, high fracture strength and toughness, excellent aesthetics, color stability and translucency. A new tough, strong and processable glass-ceramic based on the lithium metasilicate (LS) crystalline phase was developed. A glass composition was designed to produce LS crystals after appropriate treatment. The glass was melted, cast and crystallized to obtain a good microstructure. Then, its microstructure and related mechanical, optical and chemical properties were characterized with several experimental tools. Residual stresses were also measured.
This newly developed glass-ceramic shows a house-of-cards microstructure consisting of 50% by volume of 5-25 micrometer plate-like LS crystals randomly dispersed in a glass matrix. Lithium disilicate (12% by volume), two minor crystalline phases and 34% by volume of residual glass are also present. The average fracture toughness measured by the double torsion technique is 3.5 ± 0.5 MPa.m. The average fracture strength evaluated by the ball-on-three-ball (B3B) technique was 450 ± 40 MPa. The elastic modulus determined by nanoindentation was 124 ± 2 GPa and the solubility in 4%vol. acetic acid was 215 ± 30 μg/cm2, but it is not suitable for uncoated use. These properties can still be optimized. The improved toughness, strength and reasonable processability suggest that, after optimization, this glass-ceramic could be a very promising candidate for dental restorative applications
※ Please kindly noted that this product is for research use only.
