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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Contributions on crystal chemistry and thermal behaviour of anhydrous phosphates. XXXII. New orthophosphates of divalent chromium Mg3Cr3(PO4)(4), Mg3.75Cr2.25(PO4)(4), Ca3Cr3(PO4)(4), and Ca2.00Cr4.00(PO4)(4) [German]
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Contributions on crystal chemistry and thermal behaviour of anhydrous phosphates. XXXII. New orthophosphates of divalent chromium Mg3Cr3(PO4)(4), Mg3.75Cr2.25(PO4)(4), Ca3Cr3(PO4)(4), and Ca2.00Cr4.00(PO4)(4) [German]

机译:无水磷酸盐对晶体化学和热行为的贡献。 XXXII。二价铬的新正磷酸盐Mg3Cr3(PO4)(4),Mg3.75Cr2.25(PO4)(4),Ca3Cr3(PO4)(4)和Ca2.00Cr4.00(PO4)(4)[德国]

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Solid state reactions via the gas phase led in the systems A(3)(PO4)(2) / Cr-3(PO4)(2) (A = Mg, Ca) to the four new compounds Mg3Cr3(PO4)(4) (A), Mg3,75Cr2,25(PO4)(4) (B), Ca3Cr3(PO4)(4) (C), and Ca2.00Cr4.00(PO4)(4) (D). These were characterized by single crystal structure investigations [(A): P2(1), Z = 1, a = 4.863(2) Angstrom, b = 9.507(4)Angstrom, c = 6.439(2) Angstrom, beta = 91.13(6)degrees, 1855 independend reflections, 63 parameters, R1 = 0.035, wR2 = 0.083; (B): P2(1)/a, Z = 2, a = 6.427(2) Angstrom, b = 9.363(2) Angstrom, c = 10.051(3) Angstrom, beta = 106.16(3)degrees, 1687 indep. refl., 121 param., R1 = 0.032, wR2 = 0.085; (C): P-1, Z = 2, a 8.961(1) Angstrom, b = 8.994(1) Angstrom, c = 9.881(1) Angstrom, alpha = 104.96(2)degrees, beta = 106.03(2)degrees, gamma = 110.19(2)degrees, 2908 indep. refl., 235 param., R1 = 0.036, wR2 = 0. 111; (D): C2/c, Z = 4, a = 17.511(2) Angstrom, b = 4.9933(6) Angstrom, c = 16.825(2) Angstrom, beta = 117.95(1)degrees, 1506 indep. refl., 121 param., R1 = 0.034, wR2 = 0.098]. The crystal structures contain divalent chromium on various crystallographic sites, each showing a (4+n)-coordination (n = 1, 2, 3). For the magnesium compounds and Ca2.00Cr4.00(PO4)(4) a disorder of the divalent cations Mg2+/Cr2+ or Ca2+/Cr2+ is observed. Mg3.75Cr2.25(PO4)(4) adopts a new structure type, while Mg3Cr3(PO4)(4) is isotypic to Mg-3(PO4)(2). Ca3Cr3(PO4)(4) and Ca2.00Cr4.00(PO4)(4) are structurally very closely related and belong to the Ca3Cu3(PO4)(4)-structure family The orthophosphate Ca9Cr(PO4)(7), containing trivalent chromium, has been obtained besides C and D. [References: 37]
机译:通过气相的固态反应导致系统A(3)(PO4)(2)/ Cr-3(PO4)(2)(A = Mg,Ca)引入四个新化合物Mg3Cr3(PO4)(4) (A),Mg3,75Cr2,25(PO4)(4)(B),Ca3Cr3(PO4)(4)(C)和Ca2.00Cr4.00(PO4)(4)(D)。这些通过单晶结构研究[[A]:P2(1)/ n,Z = 1,a = 4.863(2)埃,b = 9.507(4)埃,c = 6.439(2)埃,β= 91.13(6)度,1855个独立反射,63个参数,R1 = 0.035,wR2 = 0.083; (B):P2(1)/ a,Z = 2,a = 6.427(2)埃,b = 9.363(2)埃,c = 10.051(3)埃,beta = 106.16(3)度,独立于1687。反射,121参数,R1 = 0.032,wR2 = 0.085; (C):P-1,Z = 2,a 8.961(1)埃,b = 8.994(1)埃,c = 9.881(1)埃,alpha = 104.96(2)度,beta = 106.03(2)度,伽马= 110.19(2)度,独立于2908。 111;反射; 235参数,R1 = 0.036,wR2 = 0。 (D):C 2 /c,Z=4,a=17.511(2)埃,b = 4.9933(6)埃,c = 16.825(2)埃,β= 117.95(1)度,独立于1506。反射,121参数,R1 = 0.034,wR2 = 0.098]。晶体结构在不同的晶体学位点上都包含二价铬,每个位点显示(4 + n)配位(n = 1,2,3)。对于镁化合物和Ca2.00Cr4.00(PO4)(4),观察到二价阳离子Mg2 + / Cr2 +或Ca2 + / Cr2 +的无序。 Mg3.75Cr2.25(PO4)(4)采用新的结构类型,而Mg3Cr3(PO4)(4)与Mg-3(PO4)(2)同型。 Ca3Cr3(PO4)(4)和Ca2.00Cr4.00(PO4)(4)在结构上密切相关,属于Ca3Cu3(PO4)(4)-结构族。正磷酸盐Ca9Cr(PO4)(7),含三价除了C和D之外,还获得了铬。[参考文献:37]

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