Strontium ion concentration effects on structural and spectral properties of Li4Sr(BO3)3 glass

Optimizing the concentration of host borate glass system to achieve a superior thermal and structural stability is challenging for sundry applications. A series of lithium strontium borate (LSBO) glasses with composition of (85−x) H3BO3−15Li2CO3−xSrCO3, where x=5, 7.5, 10, 12.5 and 15mol% are prepar...

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Bibliographic Details
Published in:Journal of non-crystalline solids 2015-11, Vol.427, p.83-90
Main Authors: Obayes, Hayder K., Hussin, R., Wagiran, H., Saeed, M.A.
Format: Article
Language:English
Subjects:
Absorption
Borates
Density
Differential thermal analysis
Glass
Infrared spectra
Ion concentration
Lithium strontium borate
Optical properties
Photoluminescence
Refractivity
Spectra
Strontium
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Summary:Optimizing the concentration of host borate glass system to achieve a superior thermal and structural stability is challenging for sundry applications. A series of lithium strontium borate (LSBO) glasses with composition of (85−x) H3BO3−15Li2CO3−xSrCO3, where x=5, 7.5, 10, 12.5 and 15mol% are prepared via melt quenching technique. Synthesized glasses are thoroughly characterized using XRD, FTIR, DTA, FESEM, PL, and UV–vis-NIR measurements to determine the influence of strontium (Sr2+) ion concentration on thermal, physical, and structural properties of the glasses. XRD pattern confirms the amorphous nature of all samples. The FESEM images verify their homogeneous and transmitting surface morphology. Physical properties are determined in terms of glass density, molar volume, molar refractivity, polaron radius, inter-nuclear distance, field-strength, and ion concentration. Glass density is found to increase from 2.53 to 2.95g/cm3 with increasing Sr2+ ion contents. FTIR spectra exhibit the presence of two fundamental peaks in the range of 700–1070cm−1 corresponding to the trigonal and tetrahedral stretching vibrations of BO3 and BO4 units. These peaks show a shift with the increase of modifier concentration. DTA results display peaks for glass transition, crystallization and melting at 500, 600 and 900°C, respectively. Prepared samples are highly stable with Hurby parameter ~0.5. The direct, indirect band gap and Urbach energy calculated from the absorption edge of UV–vis-NIR spectra lie within 3.4–3.8eV and 3.84–3.93eV, 3.84–3.25eV, respectively. The observed increase in refractive index from 2.17–2.19 is ascribed to the conversion of BO4 into BO3 units. Room temperature PL spectra under 430nm excitations display two peaks centered at 482 and 526nm accompanied by slight peak shift towards the lower wavelength due to the formation of new complexes in the glass network. Results are analyzed via different mechanism and compared. Excellent features of the results nominate these compositions potential for solid state lasers, photonic devices, and optical fibers applications. •New series of strontium doped lithium borate glasses are synthesized.•Prepared glasses have good thermal stability and highly transparent.•Influence of varying strontium contents on glass network structure and optical response are determined.•Strontium ions concentration dependent improvement in overall properties of the glasses is evidenced.
ISSN:0022-3093
1873-4812
DOI:10.1016/j.jnoncrysol.2015.07.026