Experimental determination and modeling of the solubility phase diagram of the ternary system (Li2SO4 + K2SO4 + H2O) at 288.15 K

Calcia-alumina binary compounds doped with rare earths and some transition metals cations show persistent luminescence from the visible to the infrared range. Specifically, the blue light can be obtained through the Eu2+ activator center in a potential host, such as dodecacalcium hepta-aluminate (Ca12Al14O33) and monocalcium aluminate (CaAl2O4). By doping with Nd3+, the persistent luminescence can be substantially prolonged; for this reason, the Eu/Nd pair is a potential choice for developing long-lasting blue luminescence. Herein, the phase evolution of the calcia-alumina system via molten salt synthesis is reported as a function of the synthesis temperature and the atmospheric environment. The fraction of CaAl2O4 phase increases when the temperature is higher. Synthesized microparticles of platelet-type morphology represent isolated nanostructured ceramic pieces. Under visible light, the particles are white. This indicates that the followed process solves the dark-gray coloring of phosphor when is synthesized in a reduced atmosphere at high temperature. As regards the synthesis mechanism, which is assisted by the molten flux, the dissolution-diffusion transport process is promoted at the surface of the alumina microparticles. In fact, the emission intensity can be modulated through the phase of the Eu-doped calcium-aluminate discrete platelets synthesized. Consequently, the photoluminescence intensity depends also on the oxidation state of the Eu ion. X-ray absorption near-edge structure and photoluminescence measurements corroborate the Eu reduction and the grain coarsening with the enhancement of the blue emission. The doped phosphors with Eu/Nd show a broad and strong absorption in the region of 320-400 nm and a broad emission band at around 440 nm when they are excited in this absorption range. From a broader perspective, our findings prove that the Ca12Al14O33 and CaAl2O4 phases open new opportunities for research into the design of blue long-lasting emitters for a wide range of fields from ceramic to optoelectronic materials.

/pdf/towards-blue-long-lasting-luminescence-of-eu-nd-doped-3uvap024cj.pdf

Towards Blue Long-Lasting Luminescence of Eu/Nd-Doped Calcium-Aluminate Nanostructured Platelets via the Molten Salt Route.

Solution behavior of {(formamide/N-methylformamide/N,N-dimethylformamide) + CsCl + water} ternary systems at multiple temperatures

Solubility determination and thermodynamic modelling of allisartan isoproxil in different binary solvent mixtures from T = (278.15 to 313.15) K and mixing properties of solutions

Analysis and modeling of alkali halide aqueous solutions

The solubilties of potassium chloride and potassium sulfate in aqueous glycerol solutions have been measured at temperatures ranging from (289 to 349) K using a dynamic method. The solute-free mass...

Measurement and Correlation of Solubilities of Potassium Chloride and Potassium Sulfate in Aqueous Glycerol Solutions

Solubility of sodium 4-nitrotoluene-2-sulfonate in (propanol + water) and (ethylene glycol + water) systems

To investigate the effects of NaOH and ethanol on the solubility of disodium decanedioate in water, the solubilities of disodium decanedioate in two aqueous solutions (aqueous NaOH solutions and aqueous ethanol solutions) were determined in a temperature range of (284 to 345) K. The solute-free mole fraction of NaOH and ethanol in the solvent mixtures extended from 0 to 0.084 and 0 to 0.472, respectively. With the increase of the mole fractions of ethanol (or NaOH) in solvent mixtures, the solubilities decreased obviously. Alcohol-out and alkali-out phenomena could be evidently observed, between which the alkali-out effect was more prominent. The determined data were correlated with the new electrolyte nonrandom two-liquid (E-NRTL) model, and the root-mean-square deviations of solubility temperature varied from (0.26 to 0.91) K.

Effects of NaOH and Ethanol on the Solubility of Disodium Decanedioate in Water

Investigation of sodium 4-nitrotoluene-2-sulfonate solubility in aqueous organic solutions

The solubility data of disodium 4,4′-dinitrostilbene-2,2′-disulfonate (DNSNa) in aqueous organic solutions (ethanol + water) and (ethylene diglycol + water) were investigated over the temperature range from (280 to 323) K using a dynamic method. The mole fraction of water in the two different solvent mixtures ranged from 0.2221 to 1.0000 and 0.5959 to 1.0000, respectively. The electrolyte nonrandom two-liquid (E-NRTL) model proposed by Chen was applied to model the solubility data of DNSNa in the above systems. The binary interaction parameters of the E-NRTL model were obtained via regression of the experimental solubility data. The root-mean-square deviations of determined equilibrium temperature and the calculated equilibrium temperature varied from (0.40 to 1.22) K.

Measurement and Correlation of the Solubility of Disodium 4,4′-Dinitrostilbene-2,2′-disulfonate in Aqueous Organic Solutions

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