The crystal structure of hexalead pentaborate, 6PbO.5B<sub>2</sub>O<sub>3</sub>

Krogh-Moe, J.; Wold-Hansen, P. S.

doi:10.1107/s0567740873006412

Cited by 47 publications

(20 citation statements)

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“…In addition there are three Pb atoms in the proposed model is in a hexagonal coordination with oxygen atoms all are shorter than the ionic radii of Pb and O (2.50A˚) [23]. Taking into account all bonds, the average Pb-O distance of 2.11A˚ is comparable to Pb-O covalent bond distance of 2.20A˚ and the lead atom is strongly bonded to six oxygen atoms giving rise to a distorted octahedral arrangement which are in accordance with those found in other lead containing compounds whereupon adjacent borate layers are interconnected via ionic Pb-O bonds and hydrogen bonding to form a 3D supramolecular network [24,25]. Fig.…”

Section: Ftir Absorption Spectra Of Prepared Glassessupporting

confidence: 81%

Combined DFT, Deconvolution Analysis for Structural Investigation of Copper –doped Lead Borate Glasses

Abdelghany¹

2012

TOSPECJ

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Samples from binary lead borate glass system doped with minor quantities of copper have been prepared by conventional melt-annealing technique. X-ray diffraction (XRD) has been used to prove the amorphous nature of prepared glasses. Structural and optical properties were investigated using FTIR and UV-vis. Spectroscopic investigations were approved using density function theory (DFT) calculations. Deconvolution analysis technique (DAT) combined with DFT technique were employed to interpret both of the theoretical and experimental IR data of this glass system and their agreement. Experimental IR data reveal the presence of both triangular and tetrahedral borate groups besides the sharing of Pb-O units. Direct and indirect optical energy band gaps before and after doping with different percents of copper were calculated to evaluate the role of copper in the glassy matrix. Undoped glass sample is observed to exhibit strong UV absorption due to the combined contributions of absorption of both Pb 2+ ions and trace iron impurities. The presence of both Cu 2+ ions together with the other copper valence state Cu + has been proved by the appearance of extra visible absorption bands.

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Section: Ftir Absorption Spectra Of Prepared Glassessupporting

confidence: 81%

Combined DFT, Deconvolution Analysis for Structural Investigation of Copper –doped Lead Borate Glasses

Abdelghany¹

2012

TOSPECJ

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“…). However, there is considerable evidence from crystallography that, at high x M , the Pb 2+ cation changes its role from network‐modifying to network‐forming, as may be seen from the crystal structure of 6Pb · 5B ( x M = 0.545), which has a large isolated borate “anion” consisting of two diborate groups connected together by a chain of two B (2) units. In the ionic approximation, each diborate group includes a nonbridging oxygen atom on a tetrahedrally coordinated boron atom (i.e., a

BO {normalØ}_{3}^{2 -}

tetrahedron), but examination of the Pb−O bonding reveals the presence of considerable covalent character, in that the Pb atoms are present as PbO 3 and PbO 4 pyramids with the oxygen atoms forming the base and the Pb atom the apex.…”

Section: Higher Modifier Fractionsmentioning

confidence: 99%

My Borate Life: An Enigmatic Journey

Wright

2015

Int J of Appl Glass Sci

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Borates are enigmatic materials, in both the vitreous and crystalline states, in that their structures and properties do not reflect those of the corresponding silicates. Examples are given of this unusual behavior, and it is shown that it arises from two special features that are unique to borate systems, viz. a change in the coordination number of some of the boron atoms from 3 to 4 on the introduction of a network modifier such as Na 2 O, and the presence at low modifier fractions, x M , of superstructural units, which comprise rigid combinations of the basic borate structural units. These two factors are invoked to explain the anomalous variation of the properties of borate glasses with x M , including the so-called borate anomaly, and the lecture concludes with four important questions in borate science that still remain unanswered.

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“…According to the previous research work, more compounds exist in the lead borate system, such as PbB 4 O 7 [14], Pb 6 B 11 O 18 (OH) 9 [13], Pb 6 B 10 O 21 [15], Pb 4 Bi 3 B 7 O 19 [16], Pb 2 B 5 O 9 X (X = Cl, Br, I) [17], and so on. However, there are few lead fluoride borates reported, so, we chose to grow the lead fluoride borate crystals from the PbOPbF 2 -B 2 O 3 system.…”

mentioning

confidence: 99%

Synthesis, crystal structure and optical properties of a new lead fluoride borate with isolated [B9O21]15− unit

Zhao

Pan

Han

et al. 2011

Inorganic Chemistry Communications

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The crystal structure of hexalead pentaborate, 6PbO.5B₂O₃

Cited by 47 publications

References 2 publications

Combined DFT, Deconvolution Analysis for Structural Investigation of Copper –doped Lead Borate Glasses

Combined DFT, Deconvolution Analysis for Structural Investigation of Copper –doped Lead Borate Glasses

My Borate Life: An Enigmatic Journey

Synthesis, crystal structure and optical properties of a new lead fluoride borate with isolated [B9O21]15− unit

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The crystal structure of hexalead pentaborate, 6PbO.5B2O3

Cited by 47 publications

References 2 publications

Combined DFT, Deconvolution Analysis for Structural Investigation of Copper –doped Lead Borate Glasses

Combined DFT, Deconvolution Analysis for Structural Investigation of Copper –doped Lead Borate Glasses

My Borate Life: An Enigmatic Journey

Synthesis, crystal structure and optical properties of a new lead fluoride borate with isolated [B9O21]15− unit

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Product

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The crystal structure of hexalead pentaborate, 6PbO.5B₂O₃