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STRUCTURAL STUDY OF LITHIUM BOROSILICATE GLASSES CONTAINING BOTH IRON AND NICKEL CATIONS
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STRUCTURAL STUDY OF LITHIUM BOROSILICATE GLASSES CONTAINING BOTH IRON AND NICKEL CATIONS
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Journal Article
STRUCTURAL STUDY OF LITHIUM BOROSILICATE GLASSES CONTAINING BOTH IRON AND NICKEL CATIONS
2013
Overview
Glass batches were prepared according to the molecular formula: [20 Li^sub 2^O - 31B^sub 2^O^sub 3^ - 34SiO^sub 2^ - (15 - x) NiO - xFe^sub 2^O^sub 3^] where x =0.0, 2.5, 5, 7.5, 10 and 12.5 mol%. In addition a base sample free from Ni and Fe was melted (35 Li^sub 2^O - 31B^sub 2^O^sub 3^ - 34SiO^sub 2^). Both infrared and Mössbauer spectroscopy were used to investigate the structural changes caused by the replacement of nickel by iron cations. The infrared spectra were measured over a continuous spectral range (400 to 2500 cm^sup -1^). They show that the replacement of Lithia by nickel oxide decreases the non-bridging oxygen content. Also, the replacement of nickel by iron decreases the concentration of non-bridging oxygens up to 7.5 mol% and then increases it. From the values of the Mössbauer parameters, all the ferrous cations were found to be in octahedral coordination, while all the ferric ions occupied tetrahedral coordination sites. The ratio Fe^sup 3+^ / Σ Fe^sub total^ increased on replacing nickel by iron up to 7.5 mol % and then became constant. The density increased by replacing nickel by iron up to 7.5 mol% and then decreased.
