共查询到20条相似文献,搜索用时 0 毫秒
1.
A New Oxogermanate: Li8GeO6 ? Li8O[GeO4] Transparent colourless single crystals of Li8GeO6(P63cm, a = 550.09(8), c = 1072.2(3) pm, Z = 2; 4-circle-diffractometer Siemens AED 2, MoKα; 326 Io(hkl), R = 2.4%, Rw = 2.0%), have been prepared. As by-product we always got colourless isometric single crystals of Li4GeO4. For the first time we could grow single crystals of Li8SiO6 of suitable size and quality. Our structure refinement confirms the assumed structure model [2]: Li8GeO6 and Li8SiO6 are isotypic with Li8CoO6[3] (Li8SiO6: a = 542.43(8), c = 1062.6(2) pm, Z = 2; 4-circle-diffractometer Siemens AED 2, MoKα; 306 Io(hkl), R = 3.6%, Rw= 3.0%). The known crystal structure of Li4GeO4 [4] is confirmed and refined (Cmcm, a = 776.6(2), b = 735.7(3), c = 604.9(2) pm, Z = 4; 4-circle-diffractometer Siemens AED 2, MoKα, 298 Io(hkl), R = 1.9%, Rw = 1.4%). The Madelung Part of Lattice Energy, MAPLE, and Effective coordination-Numbers, ECoN, these via Mean Fictive Ionic Radii, MEFIR, are calculated. 相似文献
2.
On TiF3 and Hexafluorotitanates(III): Cs2K[TiF6] and Rb2K[TiF6], with a remark on Rb3[TiF6] By “redox-reaction with the wall” according to A2B[CuF6] + Ti = A2B[TiF6] + Cu we obtained for the first time single crystals of the Hexafluorotitanates(III). The violett irregular single crystals of Cs2K[TiF6] (a = 9.115 Å) and Rb2K[TiF6] (a = 8.910 Å) crystalise in accordance with the single-crystal studies as supposed in spcgrp. O-Fm3m No. 225. Dark blue crystals of TiF3 crystalises in the VF3-Typ. Parameters see text. TiF3 (3.9–251.3 K) and Rb3[TiF6] (3.8–251.3 K) have been measured magnetically. The madelung part of lattice energy, MAPLE, and the effective coordination number, ECoN, via the mean fictive ionic radii, MEFIR, are calculated and discussed. 相似文献
3.
On Li8PrO6 and Li8TbO6 (with a Remark about Li8CeO6) The crystal structure of transparent pale-yellow single crystals of Li8PrO6 [a = 560.85(3), c = 1598.24(12); space group R3 ; 388 symmetry independent h kl; R = Rw = 2.60%; AgKα; fourcircle-diffractometer Philip PW 1100] and of bright yellow single crystals of Li8TbO6 [a = 554.96(3), c = 1570.97(16); space group R3 ; 274 symmetry independent hkl; R = 4.02%, Rw = 3,83%; MoKα; fourcircle-diffractometer Philips PW 1100] has been determined. The Madelung Part of Lattice Energy, MAPLE, is calculated and discussed. A new way to compare “quantitatively” isotypic structures is introduced and applied. The result shows that oxides Li8MO6 (M = Sn, Pb, Pr, Tb) are “good” isotypic. 相似文献
4.
News on K2[MnF6], Rb2[MnF6], and Cs2[MnF6] Cs2[MnF6] (a = 8.972 Å) and Rb2[MnF6] (a = 8.531 Å) as well as this with K2[MnF6] (a = 8.221 Å and hexagonal a = 5.722, c = 9.331 Å) form mixed crystals of the K2PtCl6 type of structure. Calculations of the Madelung Part of Lattice Energy, MAPLE, and Effective Coordination Numbers, ECoN, lead contrary to former assumptions to distances Mn? F of about 1.86 Å (CN 6). 相似文献
5.
New Investigations about Oxo Uranates: On α-Li6UO6. With a Remark about β-Li6UO6 The crystal structure of transparent, bright yellow single crystals of α-Li6UO6 has been determined. [a = 838.07(5), c = 738.34(7) pm; dpyk = 4.02, dx = 4.17 g · cm?3; space group R3 ; Z = 3; R = 3.17%, Rw = 3.06%; 408 symmetry independent I0(hkl); AgKα fourcircle diffractometer Philips PW 1100]. The structure is dominated by a threedimensional framwork of “hollow spaces”, built up by 12 O2? (and 12 Li+). The Madelung Part of Lattice Energy, MAPLE, is calculated and discussed. 相似文献
6.
On Hexafluorovanadates(III). Cs2MVF6 and Rb2MVF6 (M?Tl, K. and Na); with a Remark on Na3VF6 By heating the binary fluorides in a closed system we obtained Cs2TlVF6 (a = 9.234 Å), Cs2KVF6 (a = 9.047 Å), Rb2KVF6 (a = 8.855 Å) and Rb2NaVF6 (a = 8.468 Å), all cubic Elpasolithes of soft green colour as well as Cs2NaVF6 (hexagonal a = 6.24 Å, c = 30.58 Å, isotypic with Cs2NaCrF6) and Na3VF6 (monoclinic a = 5.513 Å, b = 5.721 Å, c = 7.963 Å, β = 90.47°, isotypic with Na3AlF6). VF3 (3.0–296.2°K), Cs2TlVF6, Cs2KVF6 and Rb2KVF6 (all from 70–299°K) have been measured magnetically. The spectra of reflection in the range of 9 000 to 33 000 cm?1 of VF3 and the new quaternary fluorides are measured and discussed. The Madelung Part of Lattice Energy (MAPLE) is calculated and discussed. 相似文献
7.
The First Di-Rutile: LiMnF4 (With a Remark on LiCoF4) For the first time brownish red single crystals of LiMnF4 have been prepared by thermal decomposition of Li2MnF6 or LiMnF5 (Au- tube under Ar, 600°C, 7 d). LiMnF4 crystallizes in the monoclinic crystal system, spcgr. P21/c, a = 541.4(1), b = 462.9(1), c = 569.4(1) pm, β = 113.24(2)°, Z = 2. (Four-circle diffractometer PW 1100, Fa. Philips, MoKα, 386 of 386 Io(hkl), R = 3.7, Rw = 2.5%, parameters see in the text). The Madelung Part of Lattice Energy, MAPLE, is calculated and discussed. 相似文献
8.
The Crystal Structure of Cs2S and a Remark about Cs2Se, Cs2Te, Rb2Se, and Rb2Te Cs2S crystallizes orthorhombic, a = 8.571, b = 5.383, c = 10.39 Å, Z = 4, drö = 4.13, dpyk = 4.19 g · cm?3, D–Pnma with \documentclass{article}\pagestyle{empty}\begin{document}$ \mathop {{\rm Cs}}\limits^|,\mathop {{\rm Cs}}\limits^\parallel $\end{document} and S in 4(c) each, for parameter see text. It is R = 10,4% for 202 of 222 possible reflexes. There is a sequence of S2? corresponding to the hexagonal closest packing of sphares. Cs occupies half of “tetrahedron” and all “octahedron vacancies”; the deviation of \documentclass{article}\pagestyle{empty}\begin{document}$ \mathop {{\rm Cs}}\limits^|, $\end{document} in ?oktahedron vacancies”? is noticeable. Effective Coordination Numbers, ECoN, and the Madelung Part of Lattice Energy, MAPLE, are calculated and discussed. 相似文献
9.
Novel Hexafluoromolybdates(III): Cs2MMoF6, Rb2MMoF6, TI2MMoF6 (M = K, Na), and Cs2TIMoF6. With a Notice on MoF3 MoF3, light yellow, hexag., a = b = 5.21, c = 14.41 Å, pure prepared by a new method, forms at higher temperatures with the corresponding Fluorides AF the hitherto unknown compounds Cs2KMoF6 (a = 9.20 Å), Cs2TlMoF6 (a = 9.392 Å). Rb2KMoF6 (a = 8.911 Å), Rb2NaMoF6 (a = 8.632 Å), Tl2KMoF6 (a = 8,977 Å), Tl2NaMoF6 (a = 8.649 Å) and K2NaMoF6 (a = 8.501 Å), all cubic Elpasolithes and all light yellow. The magnetic properties of MoF3 (100.4–295.2 K) and Tl2NaMoF6 (81.4–251.3 K) are investigated. The spectra of reflection were measured (15000–36000 cm?1). The Madelung Part of Lattice Energy, MAPLE, is calculated and discussed. 相似文献
10.
On Hexafluorotitantes (III). Cs2MTIF4 and Rb2MTIF4(M?K, Na); with a Remark on TI3TIF6 By heating the binary fluorides in a closed system we obtained Cs2KTiF6 (a = 9.124 Å), Rb2KTiF6 (a = 8.932 Å) and Rb2NaTiF6 (a = 8.533 Å), all cubic Elpasolithes of light blue colour as well as Cs2NaTiF6 (hexagonal a = 6.272, c = 30.91 Å, isotypic with Cs2NaCrF6) and Tl3TiF6 TiF3 (3.1–295.5°K) and Cs2KTiF6 (74.9–297.7°K) have been measured magnetically. The spectra of reflection in the range of 10 000 to 30 000 cm?1 of TiF3 and the new quaternary fluorides are similar. The Madelung Part of Lattice Energy (MAPLE) is calculated and discussed. 相似文献
11.
12.
New Elpasolithes with CoIII: Cs2KCoF6, Rb2KCoF6, Rb2NaCoF6 (with a Notice on Cs2NaCoF6) New prepared are the compounds Cs2KCoF6 (a = 8.979 Å), Rb2KCoF6 (a = 8.809 Å), Rb2NaCoF6 (a = 8.421 Å), all cubic Elpasolithes, as well as Cs2NaCoF6 (Cs2NaCrF6?type, hexagonal with a = 6.23, c = 30.32 Å) all of light blue colour. Cs2KCoF6 (72.7–299.7 K) and Rb2KCoF6 (71.4–298.0 K) have been measured magnetically. The Madelung Part of Lattice Energy (MAPLE) is calculated and discussed. 相似文献
13.
A New Oxozincate: Li6[ZnO4] Colourless single crystals of Li6[ZnO4] are formed by reaction of Li2O and ZnO [(Li2O:ZnO = 3.3:1, 700°C 50 d), Space group P42/nmc, Z = 2, a = 652.76 pm, c = 465.09 pm R = 2.6%, Rw = 2.1%, 173 symmetry independend I0(hkl), MoK]. The crystal structure has been determined. 相似文献
14.
A New Orthovanadate (V): Cs2Na[VO4] Colourless single-crystals of Cs2Na[VO4] resulted by heating intimate mixtures of CsO0.52, NaO0.52 and V2O5 (Cs: Na: V = 2.2:1.1:1.0) in tightly closed Ni-tubes. The crystal structure was determined (four-circle diffractometer data), 1341 Io(hkl), R = 6.23%, Rw = 4.23%, parameters see text. The new orthovanadate(V) crystallizes monoclinic (space group P21/m) with a = 839.9(1), b = 624.7(1), c = 614.8(1) pm, β = 92.66(1)° (Guinier-Simon powder data), Z = 2. The Madelung Part of Lattice Energy, MAPLE, and Effective Coordination Numbers, ECoN, these calculated via Mean Fictive Ionic Radii, MEFIR, are discussed. 相似文献
15.
New Nesozincates: K4[ZnO3], Rb7Na[ZnO3]2 For the first time A) K4[ZnO3] and B) Rb7Na[ZnO3]2 have been prepared (from the binary oxides). They represent the first oxozincates of the alkali metals in which the coordination number of Zn2+ is exclusively 3 (carbonate-like groups [ZnO3]). Both oxides crystallize triclinic, space group P1 with A): a = 1103.3(3), b = 881.3(3), c = 698.2(2) pm, α = 109.65(2)°, β = 89.56(2)°, γ = 102.41(3)° and Z = 4, and B): a = 1128.3(3), b = 974.5(3), c = 711,8(2) pm, α = 114.12(2)β, = = 88.46(3)°,γ = 106.48(2)° and Z = 4. Their crystal structures have been determined from single crystal data (four circle diffractometer) and refined to R = 10.1%, Rw = 7.8% (2905 unique I0(hkl)) and R = 19.5%, Rw = 17.3% (2269 unique I0(hkl)), respectively. The Madelung Part of Lattice Energy (MAPLE), Effective Coordination Numbers (ECoN) and Mean Fictive Ionic Radii (MEFIR) have been calculated. 相似文献
16.
New Alkalioxoarsenates (V). On Rb2Li[AsO4] and Cs2Li[AsO4] By heating of well-grounded mixtures of the binary oxides (A2O, Li2O2, and As2O3; A : Li : As = 2 : 1 : 1; Ni-tube, 550°C, 21 d; A = Rb, Cs) colourless single crystals of Rb2Li[AsO4] and Cs2Li[AsO4] were obtained for the first time. These new orthoarsenates(V) crystalize orthorhombic (space group C mc21? C, No. 36) with Z = 4. As expected they are isotypic with the according orthovanadates(V) [2] A2Li[VO4], A = Rb, Cs. The lattice constants of Rb2Li[AsO4]: a = 582.1(4) pm, b = 1171.1(7) pm, c = 792.4(5) pm and Cs2Li[AsO4]: a = 596.4(2) pm, b = 1223.4(2) pm, c = 819.7(3) pm were taken from Guinier-Simon powder data. The structure was determined by four-circle-diffractometer data [Siemens AED II, MoKα , 6290 I0 (hkl), R = 3.5%, Rw = 3.2% to Rb2Li[AsO4]; 3518 I0 (hkl), R = 2.8%, Rw = 2.6% to Cs2Li[AsO4]; parameters see text]. The Madelung Part of Lattice Energy, MAPLE, and Effective Coordination Numbers, ECoN, these calculated via Mean Fictive Ionic Radii, MEFIR, as well as charge distribution CHARDI are calculated and discussed. 相似文献
17.
Newly prepared are the cubic derivatives of the perovskite type of structure: K2NaInF6 (a = 8.560 Å), K2NaTlF6 (8.668), K2NaScF6 (8.482), K2NaYF6 (8.711), Cs2NaInF6 (8.905), Cs2NaTiF6 (8.995), Cs2NaScF6 (8.853), all colourless, as well as K2NaCuF6 (8.203 Å, green) and Cs2KMnF6 (tetragonal, a = 8.933; c = 9.265 Å, violett). K2NaCuF6 [μ = 2.87 μB, θ = ?17°] and Cs2KMnF6 [;μ = 4.88 μB, θ = ?5°] obey the Curie-Weiss law. The volume chemistry of the compounds is discussed in detail. 相似文献
18.
About Cs2Li2[GeO4] By heating of a well-ground mixture of the binary oxides CsO0.55, Li2O and GeO2 (Cs:Li:Ge=2,6:2,2:1; Ni-tube; 600 °C; 49d) we got single crystals of Cs2Li2[GeO4] for the first time. Cs2Li2[GeO4] is isotypic to Rb2Li2[MO4] [M = Si, Ti, Ge] [2] and Cs2Li2[MO4] (M = Si, Ti) [3]: according to this Cs2Li2[GeO4] crystallizes triclinic, in the spacegroup P1 with a = 968.7(4) pm, b = 586.0(2) pm, c = 571.4(2) pm, α = 92.71(4)°, β = 110.95(3)° and γ = 94.34(4)° (Guinier-Simon data), Z = 2. The structure was determined by four-circle diffractometer data (Ag? Kα ; 2381 Io(hkl); R = 8,4%; Rw = 5.0%), parameters see text. Further the Madelung Part of Lattice Energy (MAPLE), Effective Coordination Numbers (ECoN) and the Mean Fictive Ionic Radii (MEFIR), have been calculated. 相似文献
19.
A New Oxotantalate(V): On KLi6[TaO6] [1] For the first time hitherto unknown KLi6[TaO6] was obtained by intimately pulverized mixtures of K2O, Li2O and Ta2O5 (molar ratio K:Li:Ta = 1.1:6.6:1) in a closed Ni-cylinder (800°C, 30 d) in form of colourless single crystals; trigonal-rhomboedral (space group R3 m) with a = 822.6(1) pm, c = 721.2(1) pm (Guinier-Simonpowder data), Z = 3. The determination of the crystal structure (four cycle diffractometer data, 224 out of 224 I0 (hkl), R = 1.80%, Rw = 1.79%, absorption not considered) proves that KLi6[TaO6] is isotypic with KLi6[IrO6], a stuffed derivative of the α-Li6[UO6] structure type. The Madelung Part of Lattice Energy, MAPLE, and Effective Coordination Numbers, ECoN, the latter derived from Mean Effective Ionic Radii, MEFIR, as well as the Charge Distribution, CHARDI, are calculated and discussed. 相似文献
20.
A New Cobaltate with Isolated Anion Structure: Li6[CoO4] For the first time transparent, blue single crystals of Li6[CoO4] have been prepared (Li2O/Na2O/?CoO”? (Li:Na:Co = 1.3:1.3:1), Co-tube, 580°C, 22 d). Corresponding to Li6□CoO; it is an ordered variant of the Li2O-type of structure: P42/nmc; a = 653.6(1) pm, c = 465.4(1) pm; Z = 2; dx = 2.75 g cm?3, dpyk = 2.71 g cm?3 (4-circle-diffractometer-data (PW 1100), AgKα; 230 from 936 I0(hkl); R = 9.58%, RW = 5.25%). Parameters see text. The Madelung Part of Lattice Energy, MAPLE, and Effective Coordination Numbers, ECoN, these via Mean Fictive Ionic Radii, MEFIR, are calculated and discussed. The magnetic properties are measured in the temperature range of 14–297 K. 相似文献