Oxometallate mit inselförmigen bor-einlagerungen Ni5MB2O10

Bluhm, K.; Müller‐Buschbaum, Hk.

doi:10.1016/0022-5088(89)90156-2

Cited by 28 publications

(12 citation statements)

References 6 publications

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“…The general chemical formula is Me +3 Mе +2 2 BO 5 . Metal ions can be present as one ion with a different valence (homometallic) , and various ions (heterometallic) . Metal ions (bivalent ‐ Mg, Ni, Zn, Co, Fe, trivalent ‐ Al, V, Cr, Mn, Fe, Ga, Co, tetravalent ‐ Mn, Sn, Ge, Zr, Ti, and even pentavalent ‐ Sb, Nb) are located in the center of the oxygen octahedral coordination with common edges.…”

Section: Crystal Structurementioning

confidence: 99%

Ludwigites: From natural mineral to modern solid solutions

Софронова

Назаренко

2017

Crystal Research and Technology

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Ludwigites is a type of oxyborates compounds with BO 3 groups, which have low-dimensional elements: stairs, zigzag walls, tapes. Such structural features influence on the physical properties of the compounds and cause charge ordering, the existence of two magnetic subsystems, ordered at different temperatures in the perpendicular direction, the quasi-one-dimensional magnetism, spin-glass state. In this survey, we have summarized all known experimental and theoretical studies and analyzed the proposed by the authors mechanisms of phase transitions in the ludwigite structure oxyborates.

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Section: Crystal Structurementioning

confidence: 99%

Ludwigites: From natural mineral to modern solid solutions

Софронова

Назаренко

2017

Crystal Research and Technology

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“…Meanwhile, the combination of the flexible coordination geometries for both Ge and B atoms will afford abundant new structural types. A series of new metal or organically templated borogermanates have been synthesized during the past 2 decades. − Among them, many alkali- or alkaline-earth-metal borogermanates possess noncentrosymmetric structures and are able to exhibit a short absorption edge in the UV range and moderate SHG responses. For instance, Rb 2 GeB 4 O 9 exhibits a SHG response of 2.0 × KH 2 PO 4 (KDP) with a band gap of 5.54 eV, and CsGeB 3 O 7 a SHG response of 1.5 × KDP with a band gap of 5.76 eV. , c For borogermanates, the overall SHG response mainly originated from the B–O anionic group, while the Ge–O polyhedron contributes less.…”

Section: Introductionmentioning

confidence: 99%

Cs₂GeB₄O₉: a New Second-Order Nonlinear-Optical Crystal

Kong

et al. 2013

Inorg. Chem.

129

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A new alkali-metal borogermanate with noncentrosymmetric structure, namely, Cs2GeB4O9, has been discovered, and a large crystal with dimensions of 20 × 16 × 8 mm(3) has been grown by a high-temperature top-seeded solution method using Cs2O-B2O3 as a flux. The compound crystallizes in the tetragonal space group I4 with a = b = 6.8063(2) Å, c = 9.9523(7) Å, V = 461.05(4) Å(3), and Z = 2. It features a three-dimensional anionic open framework based on GeO4 tetrahedra and B4O9 clusters that are interconnected via corner-sharing, forming one-dimensional channels of nine-/ten-membered rings along the a and b axes, which are occupied by Cs(+) cations. Cs2GeB4O9 exhibits a very high thermal stability with a melting point of 849 °C, and it possesses a short-wavelength absorption edge onset at 198 nm determined by UV-vis transmission spectroscopy measurements on a slab of polished crystal. Powder second-harmonic generation (SHG) measurement on sieved crystals reveals that Cs2GeB4O9 is a type I phase-matchable material with a strong SHG response of about 2.8 × KH2PO4. The preliminary investigation indicates that Cs2GeB4O9 is a new promising second-order nonlinear-optical crystalline material.

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“…In the present study, we confirmed Mg 5 TiO 4 (BO 3 ) 2 as isostructural with the mineral ludwigite (Mg 2 FeO 2 BO 3 , orthorhombic, space group Pbam) and analysed its crystal structure. Synthetic oxyborates having the ludwigite structure are, for example, (Stenger et al, 1973;Armbruster & Lager, 1985), V (Bluhm & Mü ller-Buschbaum, 1989a), Mn (Bluhm & Mü ller-Buschbaum, 1989a), Ge (Bluhm & Mü ller-Buschbaum, 1989b) and Zr (Bluhm & Mü ller-Buschbaum, 1989b) (Stenger et al, 1973), Mn (Utzolino & Bluhm, 1996) and Sn (Utzolino & Bluhm, 1996)] and Zn 5 MnO 4 (BO 3 ) 2 (Busche & Bluhm, 1995).…”

Section: Commentmentioning

confidence: 99%

Mg₅TiO₄(BO₃)₂

Kawano

Yamane

2010

Acta Crystallogr C

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Single crystals of pentamagnesium titanium(IV) tetraoxide bis(borate), Mg(5)TiO(4)(BO(3))(2), were prepared by slow cooling of the melt from 1623 K in air. The crystal is isostructural with the mineral ludwigite (Mg(2)FeO(2)BO(3)). The Mg and Ti atoms are coordinated by six O atoms and the B atom is coordinated by three O atoms. There are three Mg sites and one mixed site statistically occupied by Mg and Ti atoms. Atoms are at the following special positions: 2a (0, 0, 0) and 2d (0, 1/2, 1/2) for two Mg atoms, 4g (x, y, 0) for the mixed Ti/Mg site and the BO(3) group, and 4h (x, y, 1/2) for a third Mg and two oxide O atoms. MgO(6) and (Ti/Mg)O(6) octahedra are connected by sharing of edges to form zigzag folding layers along the c axis. Triangular prismatic tunnels are formed between the folding layers by sharing apical O atoms of the MgO(6) and (Ti/Mg)O(6) octahedra.

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Oxometallate mit inselförmigen bor-einlagerungen Ni5MB2O10

Cited by 28 publications

References 6 publications

Ludwigites: From natural mineral to modern solid solutions

Ludwigites: From natural mineral to modern solid solutions

Cs₂GeB₄O₉: a New Second-Order Nonlinear-Optical Crystal

Mg₅TiO₄(BO₃)₂

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Oxometallate mit inselförmigen bor-einlagerungen Ni5MB2O10

Cited by 28 publications

References 6 publications

Ludwigites: From natural mineral to modern solid solutions

Ludwigites: From natural mineral to modern solid solutions

Cs2GeB4O9: a New Second-Order Nonlinear-Optical Crystal

Mg5TiO4(BO3)2

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Product

Resources

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Cs₂GeB₄O₉: a New Second-Order Nonlinear-Optical Crystal

Mg₅TiO₄(BO₃)₂