Luminescence Characteristics of Eu-doped Strontium Halophosphate Phosphor Particles Prepared by Spray Pyrolysis
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Eu-doped strontium halophosphate phosphor particles were first prepared by spray pyrolysis from various types of precursor sources and their luminescence characteristics were investigated. Phase-pure halophosphate particles were obtained when ammonium phosphate and ammonium dihydrogen phosphate were used as phosphorous source, while halophosphate particles were not obtained using phosphoric acid. Spherical and nonaggregated particles were obtained when ammonium phosphate and ammonium dihydrogen phosphate were used. However, the particles prepared from phosphoric acid were strongly aggregated. The particles prepared from the mixture of strontium nitrate and strontium chloride as strontium and chlorine sources, had a spherical shape and are nonaggregated. The particles prepared from strontium nitrate, strontium chloride and ammonium dihydrogen phosphate had the highest PL intensity among halophosphates due to their phase purity and spherical morphology.Keywords:
Ammonium dihydrogen phosphate
Phosphoric acid
Ammonium chloride
Ammonium phosphate
Strontium carbonate
Strontium chloride
Ammonium nitrate
Eu-doped strontium halophosphate phosphor particles were first prepared by spray pyrolysis from various types of precursor sources and their luminescence characteristics were investigated. Phase-pure halophosphate particles were obtained when ammonium phosphate and ammonium dihydrogen phosphate were used as phosphorous source, while halophosphate particles were not obtained using phosphoric acid. Spherical and nonaggregated particles were obtained when ammonium phosphate and ammonium dihydrogen phosphate were used. However, the particles prepared from phosphoric acid were strongly aggregated. The particles prepared from the mixture of strontium nitrate and strontium chloride as strontium and chlorine sources, had a spherical shape and are nonaggregated. The particles prepared from strontium nitrate, strontium chloride and ammonium dihydrogen phosphate had the highest PL intensity among halophosphates due to their phase purity and spherical morphology.
Ammonium dihydrogen phosphate
Phosphoric acid
Ammonium chloride
Ammonium phosphate
Strontium carbonate
Strontium chloride
Ammonium nitrate
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Relying on the advantage of Qinghai strontium resources,the anhydrous strontium chloride was prepared by low-grade strontium carbonate and industrial hydrochloric acid.The process of removal of barium,sulfur and other impurities from low-grade strontium carbonate was studied,and evaporation,concentration,crystallization,filtering and drying processes were also investigated.The quality of products can reach the requirements of the general industrial.Preparation of strontium chloride,not only enrich the types of strontium products in Qinghai province,but also increase the ability of resiting risk of Strontium production enterprises.
Strontium chloride
Strontium carbonate
Anhydrous
Hydrochloric acid
Barium chloride
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Fasciculate and flower-like strontium carbonate is successfully synthesized by a simple complexing reaction and homogeneous precipitation method with the raw materials,such sa strontium chloride,urea,sodium hydroxide,starch and ethylenediamineteraacetic acid disodium salt.The sample of product was analyzed by X-ray powder diffraction,scanning electron microscopy and the infrared.This research reveals that ethylenediamineterraacetic acid disodium salt and starch play important roles in determining the final produc morphology and can form submicron fasciculate and flower-like particles,which has better dispersion property and higher purity.
Strontium carbonate
Strontium chloride
Sodium hydroxide
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The carbonate reaction of some alkaline-earth chlorides was investigated by a carbonate agent injection method in LiCl-KCl eutectic salts containing both SrCl2 and BaCl2 and LiCl molten salts containing SrCl2. The effects of the injected molar ratio of a carbonate agent (Li2CO3 or K2CO3) and the temperature (450–750°C) on the conversion efficiencies of the strontium and barium chloride to their carbonates were determined. The forms of strontium and barium carbonate resulting from the carbonate reaction with carbonate agents were identified by XRD and SEM-EDS analyses. In these experiments, the carbonate agent injection method can carbonate strontium and barium chlorides effectively at over 99% under LiCl-KCl eutectic and LiCl molten salt conditions. For LiCl-KCl eutectic molten salts, carbonation efficiency was more favorable in the case of K2CO3 injection than in the case of Li2CO injection, where strontium and barium were carbonated in the form of Ba0.5Sr0.5CO3. For LiCl molten salts, strontium was carbonated in the form of SrCO3 by Li2CO3 injection.
Strontium carbonate
Barium carbonate
Barium
Alkaline earth metal
Strontium chloride
Barium chloride
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Reduction-metathesis method for preparation of strontium carbonate from celestite is developed. The effect of reducing agent, temperature and time on leaching of strontium are investigated, and the method for purification of strontium chloride solution is also studied.
Strontium carbonate
Strontium chloride
Salt metathesis reaction
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Abstract The article contains sections titled: 1. Introduction 2. Properties 3. Occurrence 4. Mining and Processing 5. Chemical Digestion of Ores 6. Strontium Compounds 6.1. Strontium Carbonate 6.2. Strontium Nitrate 6.3. Strontium Chloride 6.4. Strontium Chromate 7. Strontium Metal 8. Toxicology
Strontium chloride
Strontium carbonate
Strontium oxide
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Ammonium dihydrogen phosphate
Ammonium chloride
Crystal (programming language)
Thermal Stability
Ingot
Dielectric loss
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The carbonate reaction of some alkaline-earth chlorides was investigated by a carbonate agent injection method in LiCl-KCl eutectic salts containing both SrCl2 and BaCl2 and LiCl molten salts containing SrCl2. The effects of the injected molar ratio of a carbonate agent (Li2CO3 or K2CO3) and the temperature (450–750°C) on the conversion efficiencies of the strontium and barium chloride to their carbonates were determined. The forms of strontium and barium carbonate resulting from the carbonate reaction with carbonate agents were identified by XRD and SEM-EDS analyses. In these experiments, the carbonate agent injection method can carbonate strontium and barium chlorides effectively at over 99% under LiCl-KCl eutectic and LiCl molten salt conditions. For LiCl-KCl eutectic molten salts, carbonation efficiency was more favorable in the case of K2CO3 injection than in the case of Li2CO injection, where strontium and barium were carbonated in the form of Ba0.5Sr0.5CO3. For LiCl molten salts, strontium was carbonated in the form of SrCO3 by Li2CO3 injection.
Strontium carbonate
Barium carbonate
Strontium chloride
Barium
Alkaline earth metal
Barium chloride
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Alkaline earth metal
Strontium chloride
Strontium carbonate
Isotopes of strontium
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