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Layered double hydroxides (LDH) are a class of ionic solids characterized by a layered structure with the generic layer sequence [AcB Z AcB]n, where c represents layers of metal cations, A and B are layers of hydroxide (OH−) anions, and Z are layers of other anions and neutral molecules (such as water). Lateral offsets between the layers may result in longer repeating periods. The intercalated anions (Z) are weakly bound, often exchangeable; their intercalation properties have scientific interest and industrial applications.

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  • Layered double hydroxides
  • Hydroxyde double lamellaire
  • Слоистые двойные гидроксиды
  • 層狀雙氫氧化合物
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  • Слоистые двойные гидроксиды сокр., СДГ (англ. layered double hydroxides, сокр., LDH) — класс неорганических соединений, состоящих из положительно заряженных слоёв, образованных ионами разновалентных металлов и гидроксид-ионами, разделенных подвижными анионами и молекулами воды в межслоевом пространстве.
  • 層狀雙氫氧化合物（Layered double hydroxides, LDH），俗稱水滑石，是指某一類特殊的層狀物質，這種層狀材料是由數層帶正電荷的層與存在其中間平衡電荷的陰離子組成，中間的陰離子和層與層間作用力弱，且通常是可以被交換的。這種情況在固體化學中比較少見，許多材料是陽離子被夾在帶負電荷的層與層間。 層狀雙氫氧化合物的其中一個例子便是矽酸鹽類黏土礦如蒙脫石。而人們對層狀雙氫氧化合物較感興趣的是其層間嵌入的性質。 層狀雙氫氧化合物通常可以用下列化學通式來表達：[Mz+1-xM3+x (OH)2]q+(Xn−)q/n·yH2O。 M 代表金屬陽離子，一般而言，z = 2， 而 M2+ = Ca2+、Mg2+、Mn2+、Fe2+、Co2+、Ni2+、Cu2+ 或 Zn2+等二價金屬陽離子； 因此可知 q = x 。 已知的幾種固定組成其 x 值落在 0.2 到 0.33間。然而隨著組成不同 x 值也會有所變動，亦存在著 x > 0.5的組成例子。 也有 z = 1的情況存在，也就是當 M+ = Li+ 而 M3+ = Al3+的時候。 在這種情況下，q = 2x - 1。像這類的特殊例子則可由以下化學通式表達：[LiAl2(OH)6]X∙yH2O (LiAl2-X))。 X 代表通用的陰離子而 y 值通常落在 0.5 – 4之間。
  • Layered double hydroxides (LDH) are a class of ionic solids characterized by a layered structure with the generic layer sequence [AcB Z AcB]n, where c represents layers of metal cations, A and B are layers of hydroxide (OH−) anions, and Z are layers of other anions and neutral molecules (such as water). Lateral offsets between the layers may result in longer repeating periods. The intercalated anions (Z) are weakly bound, often exchangeable; their intercalation properties have scientific interest and industrial applications.
  • Les hydroxydes doubles lamellaires (HDLs), connus aussi sous le nom d'argiles anioniques ou composés de type hydrotalcite, sont des composés lamellaires caractérisés par la formule générale [M1−x2+Mx3+(OH)2]x+[An−]x/n·y H2O, où M représente des cations métalliques (généralement divalents et trivalents), A représente un anion intercalé dans la structure lamellaire hydratée. Les anions intercalés A sont faiblement liés et souvent échangeables.
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