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KNb4AsO13: Preparation et structure cristalline

✍ Scribed by Amor Haddad; Tahar Jouini; Yves Piffard; Noureddine Jouini


Book ID
103247950
Publisher
Elsevier Science
Year
1988
Tongue
English
Weight
386 KB
Volume
77
Category
Article
ISSN
0022-4596

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The compound Na 3 NbO(AsO 4 ) 2 was prepared by a solid-state reaction. It crystallizes in the monoclinic system, space group P2 1 /n, with a ‫؍‬ 9.637(3) A s , b ‫؍‬ 8.509(2) A s , c ‫؍‬ 10.593(2) A s , ‫؍‬ 108.67(2)°, M ‫؍‬ 455.72, V ‫؍‬ 822.9(4) A s 3 , Z ‫؍‬ 4, ‫؍‬ 3.687 g cm ؊3 . The crystal st

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The general formula of the unambiguously characterized ultraphosphate anions is \(\left[\mathrm{P}_{(n+2)} \mathrm{O}_{(3 n+5)}\right]^{n-}\). Such anions are well known for \(n=2,3,4\), and 6 . The member corresponding to \(n=5\) with calcium and yttrium cations has been just prepared. Calcium yttr