Crystal structure of the K, Ti analogue of ilímaussite-(Ce), (Ba,K,Na,Ca)11-12(REE,Fe,Th)4(Ti,Nb)6(Si6O18)4(OH)12·4.5 H2O: revision of structure model and structural formula

Verfasser / Beitragende:
[Sergey V. Krivovichev, V. N. Yakovenchuk, Th. Armbruster, Y. A. Pakhomovskiy, W. Depmeier]
Ort, Verlag, Jahr:
2003
Enthalten in:
Zeitschrift für Kristallographie - Crystalline Materials, 218/6(2003-06-01), 392-396
Format:
Artikel (online)
ID: 378881744
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024 7 0 |a 10.1524/zkri.218.6.392.20721  |2 doi 
035 |a (NATIONALLICENCE)gruyter-10.1524/zkri.218.6.392.20721 
245 0 0 |a Crystal structure of the K, Ti analogue of ilímaussite-(Ce), (Ba,K,Na,Ca)11-12(REE,Fe,Th)4(Ti,Nb)6(Si6O18)4(OH)12·4.5 H2O: revision of structure model and structural formula  |h [Elektronische Daten]  |c [Sergey V. Krivovichev, V. N. Yakovenchuk, Th. Armbruster, Y. A. Pakhomovskiy, W. Depmeier] 
520 3 |a The crystal structure of the K, Ti analogue of il¡maussite-(Ce), (Ba,K,Na,Ca)11-12(REE,Fe,Th)4(Ti,Nb)6(Si6O18)4(OH)12·4.5 H2O, from the Yukspor mountain, Khibiny massif, Kola peninsula, Russia, has been solved by direct methods and refined to R1 = 0.077 on the basis of 1762 reflections with |Fo| ≥ 4σF. The mineral is rhombohedral, R32, a = 10.708(2), c = 60.073(11) Å, V = 5965.2(17) Å3. The structure is based upon a heteropolyhedral framework that consists of layers of corner-linked polyhedra. The SiO4 tetrahedra share corners to form 6-membered rings which are further interlinked via REEO6 trigonal prisms and Tiφ6 octahedra (φ = O, OH). The obtained structure model is different from that recently reported by Rastsvetaeva et al. (2003) which is considered incorrect. 
540 |a © 2003 Oldenbourg Wissenschaftsverlag GmbH 
690 7 |a Crystallography  |2 nationallicence 
690 7 |a Inorganic chemistry  |2 nationallicence 
690 7 |a Organic chemistry  |2 nationallicence 
700 1 |a Krivovichev  |D Sergey V.  |4 aut 
700 1 |a Yakovenchuk  |D V. N.  |4 aut 
700 1 |a Armbruster  |D Th  |4 aut 
700 1 |a Pakhomovskiy  |D Y. A.  |4 aut 
700 1 |a Depmeier  |D W.  |4 aut 
773 0 |t Zeitschrift für Kristallographie - Crystalline Materials  |d De Gruyter Oldenbourg  |g 218/6(2003-06-01), 392-396  |x 2194-4946  |q 218:6<392  |1 2003  |2 218  |o zkri 
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950 |B NATIONALLICENCE  |P 700  |E 1-  |a Yakovenchuk  |D V. N.  |4 aut 
950 |B NATIONALLICENCE  |P 700  |E 1-  |a Armbruster  |D Th  |4 aut 
950 |B NATIONALLICENCE  |P 700  |E 1-  |a Pakhomovskiy  |D Y. A.  |4 aut 
950 |B NATIONALLICENCE  |P 700  |E 1-  |a Depmeier  |D W.  |4 aut 
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