Lxiv

Tennyson, Alfred Tennyson

doi:10.1017/cbo9781139583251.066

Cited by 3 publications

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“…Borate compounds have amazing structural diversity from triclinic to cubic symmetry, for the BO blocks (BO 3 and BO 4 groups) can occur isolated or linked in the form of rings, chains, layers and networks. Based on the known borate structures, a general postulate that BO blocks can link to each other only via common corners and not via edges or faces was proposed in 1967 26–30. Following this postulate, the number of possible fundamental building blocks (FBB) is greatly reduced, making it possible for subsequent researchers to develop concise theories and clearer nomenclatures for the borate structural chemistry 31–36.…”

Section: New Boratesmentioning

confidence: 99%

Single‐crystal growth: From new borates to industrial semiconductors

Wang

Chen

2010

Physica Status Solidi (a)

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In this paper, we present our progresses on single‐crystal growth of a variety of compounds from new borates to industrial semiconductors, reflecting our efforts in new compounds exploration, structure analysis, property characterization, flux growth, and vapor growth of industrial semiconductors. Typical examples are selected with each serving to show one theme. YBa3B9O18 and ErBa3B9O18, two members of a newly discovered series RBa3B9O18 (R = Y, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb) are found to be potential scintillation materials and laser hosts. KZnB3O6, the first borate with edge‐sharing BO4 tetrahedra obtained under ambient conditions, shows a very interesting selective ion exchange. The study of a well‐known crystal YVO4 reveals that the negative refraction (NR) is an intrinsic property of all uniaxial crystals. For technically important crystals, our emphases are placed on the study of growth methods. GaN is successfully realized to grow under very facile conditions based on a flux method developed from combining the phase relation calculation and experiments. Achievements on growth of 2–4 inch quality SiC wafers, both semi‐insulating and conducting, through improved physical vapor transport (PVT) method are also reported. A brief summary and our perspectives on crystal growth are given at the end. 2–4‐inch n‐type 4H‐SiC wafers grown by a PVT method.

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Section: New Boratesmentioning

confidence: 99%

Single‐crystal growth: From new borates to industrial semiconductors

Wang

Chen

2010

Physica Status Solidi (a)

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“…There are two approaches to the systematics of these compounds. Boratosilicates are considered as a separate set of boron-containing silicates [6,7]. In the borate classification [8], silicateborates constitute a separate set of borates with mixed anions; within this set, silicoborates, i.e., the borates containing subordinate amounts of silicon, and borosilicates containing subordinate amounts of boron are separated.…”

Section: Introductionmentioning

confidence: 99%

Crystallography and high-temperature crystal chemistry of anhydrous borosilicates of alkali and alkali-earth metals

2014

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UDC 548.3The crystal structures and thermal behavior of anhydrous borate-silicates of alkali and alkali-earth metals are briefly overviewed. In silicoborates (B/Si > 1), the boron atoms occur in triangle and tetrahedral coordination, as in borates; in two of three known silicoborates, the unique layered and chained polyanions are found. The known borosilicates (B/Si ≤ 1) have a framework structure formed from tetrahedrally coordinated atoms of boron and silicon; some borosilicates belong to the known structural types of aluminosilicates, while the others are only structurally similar to them and silica modifications, whereas their tetrahedral frameworks are topologically identical to that of aluminosilicates and SiO 2 . The exception are borosilicates Li 4 B 4 Si 8 O 24 and lisitsynite KBSi 2 O 6 , having the original frameworks. In line with the similarity of chemical composition and commonality of crystal structure, thermal behavior of borosilicates appears to be similar to that of aluminosilicates and silicates, however, borosilicates have considerably lower temperatures of formation, polymorphic transformations, and melting.

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“…2HzO results, allows nasinite to be classified among the phylloborates with three triangles and two tetrahedra as the repeat unit instead of the inoborates, as Tennyson (1963) concluded on the basis of data then available. Even the supposition that nasinite is the monoclinic dimorph of ezcurrite is to be reconsidered in view of the new results.…”

Section: Introductionmentioning

confidence: 99%

The crystal structure of nasinite, Na₂[B₅O₈(OH)].2H₂O

Corazza¹,

Menchetti²,

Sabelli³

1975

Acta Crystallogr Sect B

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The crystal structure of synthetic nasinite, Na2[BsOa(OH)].2H20, has been determined and refined from 1320 single-crystal diffractometer data by means of direct methods and least-squares refinement with anisotropic thermal parameters (isotropic for hydrogen atoms), giving R = 0.027. Hydrogen atoms were located on a AF map. Lattice constants determined on the same diffractometer are: a= 12.015 (2), b=6-518 (I), c= 11"173 (1)/~; space group Pna2x; Z=4. The structure is dominated by sheets in the be plane, resulting from polymerization of [BsOs(OH)] z-polyions. Both Na atoms are eightfold coordinated; one is located on the B-O sheet, the other between the hexagonal rings protruding alternately in the space between the sheets. The Na polyhedra framework is three-dimensional and provides links between B-O sheets. Additional inter-sheet connexions are provided by H bonds from the OH group and from one of the water molecules. The structure closely resembles that of Kz[BsOs(OH)].2H20; comparisons with this compound are made.

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Lxiv

Cited by 3 publications

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Single‐crystal growth: From new borates to industrial semiconductors

Single‐crystal growth: From new borates to industrial semiconductors

Crystallography and high-temperature crystal chemistry of anhydrous borosilicates of alkali and alkali-earth metals

The crystal structure of nasinite, Na₂[B₅O₈(OH)].2H₂O

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Lxiv

Cited by 3 publications

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Single‐crystal growth: From new borates to industrial semiconductors

Single‐crystal growth: From new borates to industrial semiconductors

Crystallography and high-temperature crystal chemistry of anhydrous borosilicates of alkali and alkali-earth metals

The crystal structure of nasinite, Na2[B5O8(OH)].2H2O

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The crystal structure of nasinite, Na₂[B₅O₈(OH)].2H₂O