Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Crystal structure of filatovite, K[(Al,Zn)2(As,Si 2O8], the first arsenate of the feldspar group. / Filatov, Stanislav K.; Krivovichev, Sergey V.; Burns, Peter C.; Vergasova, Lidiya P.
в: European Journal of Mineralogy, Том 16, № 3, 01.05.2004, стр. 537-543.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
}
TY - JOUR
T1 - Crystal structure of filatovite, K[(Al,Zn)2(As,Si 2O8], the first arsenate of the feldspar group
AU - Filatov, Stanislav K.
AU - Krivovichev, Sergey V.
AU - Burns, Peter C.
AU - Vergasova, Lidiya P.
PY - 2004/5/1
Y1 - 2004/5/1
N2 - The crystal structure of filatovite, K[(Al,Zn)2(As,Si 2O8] (monoclinic, I2/c, a = 8.772(1), b = 13.370(2, c = 14.690(2) Å, β = 115.944(6)°, V = 1549.1(4) Å3) has been solved by direct methods and refined to R1 = 0.033 on the basis of 1959 unique observed reflections with |Fo| ≥ 4σF. It is isotypic with the structures of celsian, Ba[Al2Si2O8], and its synthetic analogues. The structure contains four symmetry independent tetrahedral sites. The T(1) and T(4) sites have the same refined occupancy of As0.55Si0.45 and are characterized by average <T-O> bond lengths of 1.634 Å. The occupancies of the T(2) and T(3) sites are Al0.94Zn0.06 and Al0.96Zn0.04, respectively, with average <T(2 -O> and <T(3)-O> bond lengths of 1.753 and 1.754 Å, respectively. Consistent with Al-Si ordering in celsian, (As,Si O4 tetrahedra are surrounded by (Al,Zn)O4 tetrahedra and vice versa. One symmetry independent K+ cation resides in framework cavities and is coordinated by nine O atoms with the average <K-O> bond length of 3.02 Å. Incorporation of pentavalent T5+ cations into the feldspar-like tetrahedral framework is possible if it is accompanied by incorporation of T2+ and T3+ cations into adjacent tetrahedral sites.
AB - The crystal structure of filatovite, K[(Al,Zn)2(As,Si 2O8] (monoclinic, I2/c, a = 8.772(1), b = 13.370(2, c = 14.690(2) Å, β = 115.944(6)°, V = 1549.1(4) Å3) has been solved by direct methods and refined to R1 = 0.033 on the basis of 1959 unique observed reflections with |Fo| ≥ 4σF. It is isotypic with the structures of celsian, Ba[Al2Si2O8], and its synthetic analogues. The structure contains four symmetry independent tetrahedral sites. The T(1) and T(4) sites have the same refined occupancy of As0.55Si0.45 and are characterized by average <T-O> bond lengths of 1.634 Å. The occupancies of the T(2) and T(3) sites are Al0.94Zn0.06 and Al0.96Zn0.04, respectively, with average <T(2 -O> and <T(3)-O> bond lengths of 1.753 and 1.754 Å, respectively. Consistent with Al-Si ordering in celsian, (As,Si O4 tetrahedra are surrounded by (Al,Zn)O4 tetrahedra and vice versa. One symmetry independent K+ cation resides in framework cavities and is coordinated by nine O atoms with the average <K-O> bond length of 3.02 Å. Incorporation of pentavalent T5+ cations into the feldspar-like tetrahedral framework is possible if it is accompanied by incorporation of T2+ and T3+ cations into adjacent tetrahedral sites.
KW - Aluminoarsenate
KW - Crystal structure
KW - Feldspar group
KW - Filatovite
UR - http://www.scopus.com/inward/record.url?scp=2942753833&partnerID=8YFLogxK
U2 - 10.1127/0935-1221/2004/0016-0537
DO - 10.1127/0935-1221/2004/0016-0537
M3 - Article
AN - SCOPUS:2942753833
VL - 16
SP - 537
EP - 543
JO - European Journal of Mineralogy
JF - European Journal of Mineralogy
SN - 0935-1221
IS - 3
ER -
ID: 49258893