Sol-gel Lithium Borophosphates

Abstract

In this paper we present sol-gel synthesis and thermal and structural characterization of some lithium borophosphates. The as-prepared samples are mostly partially crystalline, and densification heat treatments at 500 °C cause samples to crystallize. In the phosphorus-rich part of the composition triangle we have lithium excess with respect to the nominal composition, which is likely due to the low reactivity of the phosphorus precursor. On the boron-rich side, in contrast, lithium losses are found which probably occur during syneresis.

Microstructural characteristics and crystallization of CaO–P2O5–Na2O–ZnO glass ceramics prepared by sol–gel method

“…An alkyl phosphate (prepared by dissolving P 2 O 5 in anhydrous ethanol with the presence of a non-reactive organic polymer (e.g. polyacrylic acid (PAA), gelatin)) [26] was used as the phosphorus precursor for the sol-gel synthesis of phosphate based glasses. A designed amount of sodium methoxide (CH 3 ONa), calcium nitrate tetrahydrate (Ca (NO 3 ) 2 Á 4H 2 O), and zinc nitrate Zn (NO 3 ) 2 were dissolved in a mixture solution of 60 ml ethanol and 90 ml glycol to form a solution.…”

Synthesis and structural characterization of P2O5–CaO–Na2O sol–gel materials

“…On the basis of the work of by Ali et al [18], the best phosphorus precursor for the sol-gel synthesis of phosphate glasses is an alkyl phosphate obtained by dissolving P 2 O 5 with anhydrous ethanol. Therefore, the phosphate precursor used in the present work was prepared according to the stoichiometry of the following chemical equation:…”

Spectral studies on CuO in sodium–calcium borophosphate glasses

“…In view of these qualities, these glasses are considered as materials for optical components such as IR domes, optical filters, modulators, memories and laser windows. They also have widespread applications in many different areas, e.g., as anode material for Li ion batteries (based on tin borophosphate glasses) [5,6], electrolytes in electrochemical devices [7,8], bonding agents [9] of fuel cell refractory ceramics sealing glasses [4], non-linear optical devices [10] and as low-melting glass solders or glass seals [11] derived from the phosphate sealing materials [12]. The Cu 2+ ions provide useful information regarding the structure of their network environment in a glass, as their electronic and electron spin resonance spectra are simple [13].…”