首页> 外文期刊>Acta Crystallographica, Section B. Structural Science >Structure of magnesium hydroxide sulfate [2MgSO(4).Mg(OH)(2)] and solid solution in magnesium hydroxide sulfate hydrate and caminite
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Structure of magnesium hydroxide sulfate [2MgSO(4).Mg(OH)(2)] and solid solution in magnesium hydroxide sulfate hydrate and caminite

机译:硫酸镁氢氧化物[2MgSO(4).Mg(OH)(2)]的结构以及在硫酸镁水合物和水岭石中的固溶体

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Magnesium hydroxide sulfate [2MgSO(4).Mg(OH)(2); MHS] is tetragonal with a = 7.454(1), c = 12.885(2) Angstrom, V = 716.0 Angstrom(3), space group P4(3)2(1)2, Z = 4 and D-x 2.774 g cm(-3). The structure (single-crystal X-ray, R = 0.025, wR = 0.023) comprises spiral (43) Single chains of corner-shared Mg(2) octahedra cross-linked by SO4 tetrahedra and face-shared Mg(1) octahedra. A linear ternary group of face-shared Mg octahedra [Mg(2)-Mg(1)-Mg(2)] alternates with an unoccupied octahedral position in rows along [<(1)over bar 10>]. A crystal of MHS was grown hydrothermally (0.15 Cpa, 673 K) from gold-bearing MgS-O-H fluid. The MHS structure, with Mg(1) octahedra sharing two octahedral faces with Mg(2) octahedra, revises the structure assumed for the complex solid solution magnesium hydroxide sulfate hydrate and the related ocean-floor mineral caminite [2MgSO(4).xMg(OH)(2).(2 - 2x)H2O; 0.5 less than or equal to x < 1.0]. The substitution reaction appears to be Mg(1)(2+) reversible arrow 2H(+). The H-substituted MHS structure is distinguished from that of kieserite (MgSO4.H2O), which has straight single chains of corner-shared Mg octahedra.
机译:氢氧化镁硫酸镁[2MgSO(4).Mg(OH)(2); [MHS]是四边形,a = 7.454(1),c = 12.885(2)埃,V = 716.0埃(3),空间群P4(3)2(1)2,Z = 4和Dx 2.774 g cm(- 3)。结构(单晶X射线,R = 0.025,wR = 0.023)包括螺旋形(43)通过SO4四面体和面共享Mg(1)八面体交联的角共享Mg(2)八面体单链。面共享Mg八面体[Mg(2)-Mg(1)-Mg(2)]的线性三元组沿[<(1)在条10>上的行中以未占用的八面体位置交替排列。从含金的MgS-O-H流体中水热生长(0.15 Cpa,673 K)MHS晶体。 MHS(Mg(1)八面体与Mg(2)八面体共享两个八面体面)结构修改了为复杂固溶体氢氧化镁硫酸盐水合物和相关海底矿物皂液[2MgSO(4).xMg( OH)(2)。(2-2x)H2O; 0.5小于或等于x <1.0]。取代反应似乎是Mg(1)(2+)可逆箭头2H(+)。 H取代的MHS结构不同于褐铁矿(MgSO4.H2O),后者具有角共享的Mg八面体的直单链。

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