paratungstate

Example Sentences

• "PARATUNGSTATES. A number of acid tungstates have been isolated, the composition of which is expressed by one of the formulæ 3RO.7WO₃ or 5RO.12WO₃. The former formula was given by Lotz (A. 91, 49) and Scheibler (J. pr. 83, 273) ; the latter formula by Laurent (A. Ch. [3] 21, 54) and Marignac (A. Ch. [3] 69, 5). The two formulæ represent salts of almost identical composition, and no way has been found of deciding which formula is the better (cf. Knorre, J. pr. [2] 27, 83). The acid tungstates of this series are more easily formed and crystallise better than the other acid salts ; they are generally called paratungstates, following the suggestion made by Marignac. The alkali paratungstates are obtained by saturating hot alkali solutions with WO₃ and crystallising ; most of the other paratungstates are prepared by ppn. [precipitation] from solutions of the alkali salts. […] If the simpler (3:7) formula is adopted, the paratungstates are represented as 3Rᴵ₂O.7WO₃, 3RᴵᴵO.7WO₃, and Rᴵᴵᴵ₂O₃.7WO₃, i.e. as salts of the hypothetical acid H₁₀W₁₂O₄₁ […] ; if the less simple formula (5:12) is adopted, the paratungstates of monovalent and divalent metals are regarded as […]"
• "The benchmark price for ammonium paratungstate – the white crystalline powder that is the standard intermediate stage that virtually all mined tungsten passes through before being refined into metal, carbide cutting tools, or missile-grade alloys – has risen 716% in a year. The price chart looks almost vertical. Russia, meanwhile, controls 46% of global uranium-enrichment capacity, a choke point that Western utilities are only now starting to engineer around."