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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >High temperature hydrothermal synthesis of rare-earth titanates: synthesis and structure of RE5Ti4O15(OH) (RE = La, Er), Sm3TiO5(OH)(3), RE5Ti2O11(OH) (RE = Tm-Lu) and Ce2Ti4O11
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High temperature hydrothermal synthesis of rare-earth titanates: synthesis and structure of RE5Ti4O15(OH) (RE = La, Er), Sm3TiO5(OH)(3), RE5Ti2O11(OH) (RE = Tm-Lu) and Ce2Ti4O11

机译：高温水热合成稀土钛合物：Re5Ti4O15（OH）的合成和结构（Re = La，ER），SM3TiO5（OH）（3），Re5Ti2O11（OH）（Re = TM-Lu）和Ce2Ti4O11

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Reactions of rare-earth oxides with TiO2 were performed in high temperature (650-700 degrees C) hydrothermal fluids. Two different mineralizer fluids were examined, 20 M KOH and 30 M CsF, and their respective products analyzed. When concentrated KOH fluids were used, single crystals of a variety of new OH- containing species were isolated and structurally characterized: RE5Ti4O15(OH) (RE = La, Er) I, Sm3TiO5(OH)(3)II and RE5Ti2O11(OH) (RE = Tm-Lu) III. La5Ti4O15(OH) I crystallizes in the orthorhombic space group Pnnm with unit cell dimensions of a = 30.5152(12) angstrom, b = 5.5832(2) angstrom, c = 7.7590(3) angstrom and V = 1321.92(9) angstrom(3), Z = 4. Sm3TiO5(OH)(3)II crystallizes in the monoclinic space group P2(1)/m with unit cell parameters of a = 5.6066(2) angstrom, b = 10.4622(4) angstrom, c = 6.1258(2) angstrom and beta = 104.7390(10)degrees, V = 347.50(2) angstrom(3), Z = 2. Lu5Ti2O11(OH) III crystallizes in the monoclinic space group C2/m with unit cell dimensions of a = 12.1252(9) angstrom, b = 5.8243(4) angstrom, c = 7.0407(5) angstrom, beta = 106.939(3)degrees and V = 475.65(6) angstrom(3), Z = 2. When concentrated fluoride solutions are used, mostly RE2Ti2O7 type compounds were isolated in either cubic or monoclinic phases. In the case of cerium, Ce2Ti4O11IV was isolated that crystallizes in the monoclinic space group C2/c with unit cell parameters of a = 13.6875(7) angstrom, b = 5.0955(3) angstrom, c = 12.8592(7) angstrom, beta = 108.964(2)degrees and V = 848.18(8) angstrom(3), Z = 4. The synthesis, structural characterization, and supporting characterization are reported for all compounds. The work highlights the complementary nature of hydroxide and fluoride fluids in studying the reactivity of refractory oxides.
机译：有TiO 2稀土氧化物的反应在高温（650-700℃）热流体进行。两种不同的矿化剂流体进行了检查，20男KOH和30男CsF和各自的产品进行分析。当使用浓缩的KOH流体，各种新的含OH-物种的单晶进行分离和结构表征：RE5Ti4O15（OH）（RE = La时Er）的I，Sm3TiO5（OH）（3）II和RE5Ti2O11（OH） （RE = TM-路）III。 La5Ti4O15（OH）我的斜方晶系空间群Pnnm中结晶为a = 30.5152（12）埃的单位晶胞尺寸，B = 5.5832（2）埃，c = 7.7590（3）埃和V = 1321.92（9）埃（3 ），Z = 4。Sm3TiO5（OH）（3）II结晶单斜空间群P2（1）其中a = 5.6066（2）埃的晶胞参数/ M，b = 10.4622（4）埃，c = 6.1258 （2）埃和β= 104.7390（10）度，V = 347.50（2）埃（3）中，Z = 2。Lu5Ti2O11（OH）III结晶的单斜晶系空间群C2 / m与的单位晶胞尺寸= 12.1252 （9）埃，b = 5.8243（4）埃，c = 7.0407（5）埃，β= 106.939（3）°，V = 475.65（6）埃（3）中，Z = 2。当浓缩的氟化物溶液用于，大多RE2Ti2O7型化合物在立方或单斜相任一隔离。在铈的情况下，Ce2Ti4O11IV分离，在单斜晶系空间群为C2 / c为a = 13.6875（7）埃的晶胞参数，B = 5.0955（3）埃，c = 12.8592（7）埃，β=结晶108.964（2）°，V = 848.18（8）埃（3）中，Z = 4的合成，结构表征，和支撑表征报道了所有化合物。这项工作强调了学习难熔氧化物的活性氢和氟流体的互补性。

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