• alkaline
  • 252301.4 2 Claims ABSTRACT OF THE DISCLOSURE Alkaline-earth metal pyrophosphate phosphor is activated by lithium plus any of terbium, europium, samarium, terbium plus europium or europium plus samarium, which phosphor efiiciently converts ultraviolet radiation to visible radiation. (google.com)
  • BACKGROUND OF THE INVENTION This invention relates to phosphors, and more particularly to alkaline-earth metal pyrophosphate activated by rare-earth elements. (google.com)
  • These and other apparent objects are achieved by providing a phosphor consisting essentially of alkaline-earth metal pyrophosphate activated by terbium plus lithium, europium plus lithium, samarium plus lithium, terbium plus europium plus lithium, or europium plus samarium plus lithium. (google.com)
  • The phosphors of the present invention are expressible by the formula M P o zZ, Li, wherein M is at least one alkaline-earth metal, and Z is any of the indicated rareearth metals, or any of the aforestated mixtures of rareearth metal plus lithium to phosphorus can vary from 0.01 to 0.4 although the preferred atom ratio of total rare-earth metal plus lithium to phosphorus is about 0.1. (google.com)
  • any one of the chemical elements of the main subgroup of Group II of Mendeleev's periodic system, comprising the calcium family: calcium, strontium, barium, and radium (beryllium and magnesium are also sometimes considered to be alkaline-earth metals). (thefreedictionary.com)
  • The alkaline-earth metals exhibit an oxidation number of +2 in their compounds. (thefreedictionary.com)
  • Preferably said phosphonopolycarboxylate sequestering agents are present as water-soluble salts capable of complex formation with alkaline earth metal ions. (google.es)
  • The invention also resides in the process of sequestering alkaline earth metal ions using aqueous solutions of the washing agent composition. (google.es)
  • rare earth el
  • According to the reports and presentation, "Capacscaya contains both light- and heavy rare earth elements and metals, as well as copper, zinc, cobalt, aluminum, iron and other base metals. (thefreedictionary.com)
  • 22, 2015 /PRNewswire/ -- RioSol SAC LLC and Compania Minera Rio Sol SAC ("RioSol" or "The Company") last month announced a significant rare earth element and poly-metallic claim discovery in Peru, with reports indicating the 10-kilometer Capacscaya and adjacent claims as having the highest rare earth ranges in Peru containing both light rare earth elements (LREEs) and heavy rare earth elements and metals (HREEs). (thefreedictionary.com)
  • group
  • Rare earth metals are part of a group of 17 chemically similar elements found in the earth's crust. (thefreedictionary.com)
  • 5. The composition of claim 1 wherein said component (b) includes an alkali metal salt selected from the group consisting of carbonates and silicates, and the weight ratio of said phosponopolycarboxylate to said alkali metal salt is between 1:100 and 4:1. (google.es)