Properties Of Li2O Research Articles

Effect of the Atmosphere on Physical Optical and Luminescence Properties of Li2O:Y2O3:B2O3:CeF3 Glasses

In this research intended to fabricate and develop an electrical furnace as the vacuum systems for melting glass by normal melt quenching technique under vacuum atmosphere. The 60Li2O: 10Y2O3: 29.5 B2O3: 0.5CeF3 glass system was prepared by this furnace. The properties of glass that prepare in air and vacuum atmosphere and comparative studied various properties such as physical, optical, luminescence. The result has shown that the density and refractive index was slightly decrease. The absorption edge of vacuum sample was shifted to shorter wavelength. The indirect and direct band gap of the vacuum glass sample higher than the air atmosphere glass sample which corresponded to the molar volume increase representing the enhancement of non-bridging oxygen (NBO) number in glass network. The photoluminescence of glass which preparing in vacuum was higher than in air about 2 times while the decay time are 101.83 ns (air) and 88.72 ns (vacuum), respectively.

Effect of Heat Treatment Temperature on the Microstructure and Mechanical Properties of Li2O–SiO2–P2O5–Al2O3–K2O–CaO Glass-Ceramics

Effect of Heat Treatment Temperature on the Microstructure and Mechanical Properties of Li₂O–SiO₂–P₂O₅–Al₂O₃–K₂O–CaO Glass-Ceramics

Low temperature sintering and microwave dielectric properties of Li2O–3ZnO–5TiO2 ceramics doped with V2O5

Novel low-temperature sinterable Li2O–3ZnO–5TiO2 (LZT135) ceramics were prepared through a solid-state reaction method. XRD and EDS results showed that the LZT135 ceramics formed solid solutions with a crystal structure similar to Zn2Ti3O8. The addition of V2O5 could decrease the sintering temperature of LZT135 ceramics to about 900 °C. When 0.6 wt% V2O5 was added, the LZT135 ceramics exhibited dielectric properties with relative permittivity (er) = 20.2, quality factor (Q×f) = 59,000 GHz, and temperature coefficient of resonant frequency (τf) = − 30.2 ppm/°C at a sintering temperature of 900 °C. However, the τf value was still too high for industrial applications; therefore, TiO2 was added to the LZT135 ceramics to further adjust the τf value. Finally, near-zero τf values and simultaneously desirable Q×f values were maintained for the low-temperature sintered LZT135 ceramics. The LZT135 ceramics doped with 0.6 wt% V2O5 and 6 wt% TiO2 exhibited reasonably good microwave dielectric properties with er = 24.3, Q×f = 51,700 GHz, and τf = 0.3 ppm/°C when sintered at 900 °C, thus showing a great potential for low-temperature co-firing ceramic applications.

Physical and Optical Properties of Li2O–MgO–B2O3Doped with Dy3+

Physical and Optical Properties of Li₂O–MgO–B₂O₃Doped with Dy³⁺

Elastic, mechanical, and thermodynamical properties of superionic lithium oxide for high pressures

The elastic and thermodynamic properties of Li2O for high pressures are presented. For cubic Li2O, model effective interatomic interaction potential incorporating long-range Coulomb, charge transfer interactions, covalency effect, Hafemeister and Flygare type short-range overlap repulsion extended up to the second neighbor ions and van der Waals interactions is formulated. Both charge transfer interactions and covalency effect apart from long-range Coulomb are important in revealing high-pressure-induced associated volume collapse, elastic, and thermodynamical properties. The elastic constants, Debye temperature, and thermal expansion coefficient obtained are in good agreement with the available experimental data and other theoretical results. The Li2O is mechanically stiffened, thermally softened, and brittle in nature as inferred from the pressure-dependent elastic constants behavior. To our knowledge, this is the first quantitative theoretical prediction of the pressure dependence of elastic, thermal, and thermodynamical properties of Li2O and still awaits experimental confirmation.

Effect of alumina on the structure and properties of Li 2O–B 2O 3–P 2O 5 glasses

The structure of glasses within the system Li 2O–Al 2O 3–B 2O 3–P 2O 5 has been studied through 31P, 11B and 27Al Nuclear Magnetic Resonance, and the effect of Al 2O 3 substitution by B 2O 3 and P 2O 5 network formers on the structure and properties investigated for a constant Li 2O content. Multinuclear NMR results reveal that substitution of Al 2O 3 for B 2O 3 and P 2O 5 network formers in a glass with composition 50Li 2O·15B 2O 3·35P 2O 5 produces a change in boron environment from four-fold to three-fold coordination. Meanwhile aluminum can be present in four-, five- and six-fold coordinations a higher amount of Al(IV) groups is found for increasing alumina contents. The behavior of the glass transition temperature and electrical conductivity of the glasses has been interpreted as a function of the structural changes induced in the glass network when alumina is substituted for B 2O 3, P 2O 5 or both. Small additions of alumina produce a drastic increase in glass transition temperature, while it does not change for [Al 2O 3] greater than 3 mol.%. However, the electrical conductivity shows very different behavior depending on the type of substitution; it can remain constant when B 2O 3 content decreases or sharply decrease when P 2O 5 is substituted by Al 2O 3, which is attributed to a higher amount of BO 3 and phase separation.

Solubility and thermodynamic properties of Li2O in LiF-CaF2 melts

Solubility and thermodynamic properties of Li2O in LiF-CaF2 melts