Abstract
Single crystals of Zn Geo3 ilmenite have been synthesized at 180kbar and 1500°Cu singauni axial split-sphere apparatus. The crystal structure of ZnGeo3 ilmenite has been determined with 588counter-measured intensities refined by the least-squares method to R=0.020 and Rw=0.021. Zn Geo3 ilmenitei strigonal with a=4.9568(8)Å, c=13.860(2)Å, V=294.91(11)Å3, space group R3 and Z=6. Zinc and germaniumatoms are completely ordered in the structure;the average Zn—O and Ge—O distances are 2.144Å and 1.898Å, respectively. The ZnO6 octahedra in Zn Ge03 ilmenite display one of the largest quadratice longationand bondang levariance values among compounds with the ilmenites tructure. The distortion and height of the GeO6 octahedra in ZnGeO3 ilmeniteare comparable with those observed in other germanateilmenites, consistent with the trend that distortion of the B4+O6 octa hedra changes little upon substitution of different A2+ cations in the structure. Analysis of c/a systematics shows that c/a increases linearly among the germanate and titanateilmenites as the‘size mismatch’(i. e. difference in ionic radii)between the A2+ and B4+ cations increases. The differentsl opesofthe two different groups shows that c/a is less affected by substitution of larger A2+ cations in titanateilmenitesth an germanateilmenites where the ‘size mismatch’ is greater.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 93-104 |
| Number of pages | 12 |
| Journal | Zeitschrift fur Kristallographie - New Crystal Structures |
| Volume | 191 |
| Issue number | 1-2 |
| DOIs | |
| State | Published - Jan 1 1990 |
| Externally published | Yes |
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Keywords
- Crystalstructure
- Ilmenitesystematics
- Synthesis
- Zincgermanate
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Inorganic Chemistry
Cite this
Single crystal structure refinement of high-pressure ZnGeO3 ilmenite. / Ross, Nancy L.; Leinenweber, Kurt.
In: Zeitschrift fur Kristallographie - New Crystal Structures, Vol. 191, No. 1-2, 01.01.1990, p. 93-104.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Single crystal structure refinement of high-pressure ZnGeO3 ilmenite
AU - Ross, Nancy L.
AU - Leinenweber, Kurt
PY - 1990/1/1
Y1 - 1990/1/1
N2 - Single crystals of Zn Geo3 ilmenite have been synthesized at 180kbar and 1500°Cu singauni axial split-sphere apparatus. The crystal structure of ZnGeo3 ilmenite has been determined with 588counter-measured intensities refined by the least-squares method to R=0.020 and Rw=0.021. Zn Geo3 ilmenitei strigonal with a=4.9568(8)Å, c=13.860(2)Å, V=294.91(11)Å3, space group R3 and Z=6. Zinc and germaniumatoms are completely ordered in the structure;the average Zn—O and Ge—O distances are 2.144Å and 1.898Å, respectively. The ZnO6 octahedra in Zn Ge03 ilmenite display one of the largest quadratice longationand bondang levariance values among compounds with the ilmenites tructure. The distortion and height of the GeO6 octahedra in ZnGeO3 ilmeniteare comparable with those observed in other germanateilmenites, consistent with the trend that distortion of the B4+O6 octa hedra changes little upon substitution of different A2+ cations in the structure. Analysis of c/a systematics shows that c/a increases linearly among the germanate and titanateilmenites as the‘size mismatch’(i. e. difference in ionic radii)between the A2+ and B4+ cations increases. The differentsl opesofthe two different groups shows that c/a is less affected by substitution of larger A2+ cations in titanateilmenitesth an germanateilmenites where the ‘size mismatch’ is greater.
AB - Single crystals of Zn Geo3 ilmenite have been synthesized at 180kbar and 1500°Cu singauni axial split-sphere apparatus. The crystal structure of ZnGeo3 ilmenite has been determined with 588counter-measured intensities refined by the least-squares method to R=0.020 and Rw=0.021. Zn Geo3 ilmenitei strigonal with a=4.9568(8)Å, c=13.860(2)Å, V=294.91(11)Å3, space group R3 and Z=6. Zinc and germaniumatoms are completely ordered in the structure;the average Zn—O and Ge—O distances are 2.144Å and 1.898Å, respectively. The ZnO6 octahedra in Zn Ge03 ilmenite display one of the largest quadratice longationand bondang levariance values among compounds with the ilmenites tructure. The distortion and height of the GeO6 octahedra in ZnGeO3 ilmeniteare comparable with those observed in other germanateilmenites, consistent with the trend that distortion of the B4+O6 octa hedra changes little upon substitution of different A2+ cations in the structure. Analysis of c/a systematics shows that c/a increases linearly among the germanate and titanateilmenites as the‘size mismatch’(i. e. difference in ionic radii)between the A2+ and B4+ cations increases. The differentsl opesofthe two different groups shows that c/a is less affected by substitution of larger A2+ cations in titanateilmenitesth an germanateilmenites where the ‘size mismatch’ is greater.
KW - Crystalstructure
KW - Ilmenitesystematics
KW - Synthesis
KW - Zincgermanate
UR - http://www.scopus.com/inward/record.url?scp=84961479624&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84961479624&partnerID=8YFLogxK
U2 - 10.1524/zkri.1990.191.1-2.93
DO - 10.1524/zkri.1990.191.1-2.93
M3 - Article
AN - SCOPUS:84961479624
VL - 191
SP - 93
EP - 104
JO - Zeitschfrift fur Kristallographie
JF - Zeitschfrift fur Kristallographie
SN - 1433-7266
IS - 1-2
ER -