Borates: a survey of main trends concerning crystal-chemistry, polymorphism and dehydration process of alkaline and pseudo-alkaline borates

Touboul, M.; Penin, Nicolas; Nowogrocki, G.

doi:10.1016/s1293-2558(03)00173-0

Cited by 218 publications

(145 citation statements)

References 122 publications

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“…First, the building units of borates, BO 3 triangles and BO 4 tetrahedra tend to polymerize under a variety of conditions to form countless types of polyborate anions which provides numerous bonding modes to possibly coordinate the metal centers with a variety of geometric requirements. [58][59][60][61][62] Second, borate itself is a non-redox-active ligand under most conditions. This provides us an opportunity of controlling or at least predicting the oxidation states of actinides in products by controlling the oxidation states of actinides and the reduction potentials in the starting materials.…”

Section: Neptunium Boratesmentioning

confidence: 99%

Recent progress in actinide borate chemistry

et al. 2011

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The use of molten boric acid as a reactive flux for synthesizing actinide borates has been developed in the past two years providing access to a remarkable array of exotic materials with both unusual structures and unprecedented properties.[ThB 5 O 6 (OH) 6 ][BO(OH) 2 ]Á2.5H 2 O possesses a cationic supertetrahedral structure and displays remarkable anion exchange properties with high selectivity for TcO 4 À . Uranyl borates form noncentrosymmetric structures with extraordinarily rich topological relationships. Neptunium borates are often mixed-valent and yield rare examples of compounds with one metal in three different oxidation states. Plutonium borates display new coordination chemistry for trivalent actinides. Finally, americium borates show a dramatic departure from plutonium borates, and there are scant examples of families of actinides compounds that extend past plutonium to examine the bonding of later actinides. There are several grand challenges that this work addresses. The foremost of these challenges is the development of structure-property relationships in transuranium materials. A deep understanding of the materials chemistry of actinides will likely lead to the development of advanced waste forms for radionuclides present in nuclear waste that prevent their transport in the environment. This work may have also uncovered the solubility-limiting phases of actinides in some repositories, and allows for measurements on the stability of these materials.

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Section: Neptunium Boratesmentioning

confidence: 99%

Recent progress in actinide borate chemistry

et al. 2011

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“…[32][33][34][35] In borates, the fundamental building blocks (FBBs) concept is widely applied in describing the features of borate polyanions. [36][37][38][39][40][41] In H 2 InB 5 O 10 , the FBB in the borate net is a pentaborate anion B 5 O 14 , which can be expressed as 5:[(5:5T)], as shown in Figure 3a. This pentaborate anion is formed by five BO 4 tetrahedra in a spiro-5 connection mode, [25][26][27] which is different from the three known pentaborate FBBs [40,41] as shown in Figure 3b.…”

Section: Crystal Structure Of H 2 Inb 5 O 10mentioning

confidence: 99%

H₂InB₅O₁₀: A New Pentaborate Constructed from 2D Tetrahedrally Four‐Connected Borate Layers and InO₆ Octahedra

Cong

Yang

et al. 2010

Eur J Inorg Chem

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H2InB5O10, a new hydrated indium pentaborate, was prepared by the boric acid flux method and characterized by IR, solid‐state 11B MAS NMR and 1H CRAMPS NMR spectroscopy. Its structure was determined by powder X‐ray diffraction and refined by Rietveld analysis. H2InB5O10 crystallizes in the monoclinic space group C2. The structure features a new 2D tetrahedrally four‐connected borate network constructed from a new pentaborate fundamental building block, B5O14. The 2D borate network is formed by two 63 borate layers linked by additional BO4 groups in a spiro‐5 mode and then combines with InO6 octahedra to give rise to the 3D structure of H2InB5O10. The strong hydrogen bonds that cross‐link oxygen atoms of additional BO4 groups between the borate layers help to stabilize the borate network.

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“…According to the notation after Touboul, Penin, and Nowogrocki [29], these triborate, tetraborate and pentaborate groups are symbolized as 3:[3:(2∆ + T)], 4:[4:(2∆ + 2T)] and 5:[(3∆ + 2T)], respectively. On the basis of both of these approaches, modified descriptors for the description of rigid groups were worked out by Guan and Xue [30].…”

Section: Introductionmentioning

confidence: 99%

Borates—Crystal Structures of Prospective Nonlinear Optical Materials: High Anisotropy of the Thermal Expansion Caused by Anharmonic Atomic Vibrations

et al. 2017

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Abstract:In the present study the thermal structure evolution is reviewed for known nonlinear optical borates such as β- (98-348 K). In addition to the established criteria for nonlinear optical (NLO) properties of crystals, here the role of the anisotropy and anharmonicity of the thermal vibrations of atoms is analysed as well as changes in their coordination spheres and the anisotropy of the thermal expansion of the crystal structure. Non-centrosymmetric borates, especially those that have NLO properties, often show distinct anisotropies for each cation in comparison to centrosymmetric borates. All considered NLO borates contain BO 3 triangles, which are the principal cause of the strong anisotropy of the thermal expansion.Keywords: NLO borates; crystal structures at low and high temperatures; rigid boron-oxygen groups; anisotropic and anharmonic atomic vibrations; thermal expansion; low-and high-temperature single-crystal and powder X-ray diffraction

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Borates: a survey of main trends concerning crystal-chemistry, polymorphism and dehydration process of alkaline and pseudo-alkaline borates

Cited by 218 publications

References 122 publications

Recent progress in actinide borate chemistry

Recent progress in actinide borate chemistry

H₂InB₅O₁₀: A New Pentaborate Constructed from 2D Tetrahedrally Four‐Connected Borate Layers and InO₆ Octahedra

Borates—Crystal Structures of Prospective Nonlinear Optical Materials: High Anisotropy of the Thermal Expansion Caused by Anharmonic Atomic Vibrations

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Borates: a survey of main trends concerning crystal-chemistry, polymorphism and dehydration process of alkaline and pseudo-alkaline borates

Cited by 218 publications

References 122 publications

Recent progress in actinide borate chemistry

Recent progress in actinide borate chemistry

H2InB5O10: A New Pentaborate Constructed from 2D Tetrahedrally Four‐Connected Borate Layers and InO6 Octahedra

Borates—Crystal Structures of Prospective Nonlinear Optical Materials: High Anisotropy of the Thermal Expansion Caused by Anharmonic Atomic Vibrations

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H₂InB₅O₁₀: A New Pentaborate Constructed from 2D Tetrahedrally Four‐Connected Borate Layers and InO₆ Octahedra