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
\(\mathrm{Na}_{2} \mathrm{~V}_{3} \mathrm{P}_{2} \mathrm{O}_{13}\) was synthesized by a solid state reaction at \(540^{\circ} \mathrm{C}\). His orthorhombic, Pccn, with \(a=10.186(4), b=11.976(3), c=\) \(8.377(4) \AA, V=1022.0 \AA^{3}, Z=4\). The structure was solved and refined to \(R=0.0517\) and
A new molybdenylarsenate NaMoO 2 AsO 4 has been isolated. The single-crystal X-ray diffraction study of this phase has shown that it is noncentrosymmetric. It crystallizes in the Pca2 1 (No. 29) space group with a,)3(177.41؍ b,)2(665.6؍ c"10.101(1) A s , Z,8؍ V)4(7.979؍ A s 3 , R(F 2 ,920.0
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