The Crystal Structure of Calcium Metaborate, CaB<sub>2</sub>O<sub>4</sub>

Zachariasen, W. H.; Ziegler, G. E.

doi:10.1524/zkri.1932.83.1.354

Cited by 23 publications

(19 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The first anhydrous alkali or alkaline earth borate crystalline structure, calcium metaborate (CaO·B 2 O 3 ), was determined by Zachariasen & Ziegler in 1932, the same year as Zachariasen's classic paper on The Atomic Arrangement in Glass , and comprises Ca 2+ cations together with infinite chains of

BO {normalØ}_{2}^{-}

(B (2) ) borate structural units (Fig. C), as shown in Fig.…”

Section: Structural Historymentioning

confidence: 99%

My Borate Life: An Enigmatic Journey

Wright

2015

Int J of Appl Glass Sci

View full text Add to dashboard Cite

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.

show abstract

BO {normalØ}_{2}^{-}

(B (2) ) borate structural units (Fig. C), as shown in Fig.…”

Section: Structural Historymentioning

confidence: 99%

My Borate Life: An Enigmatic Journey

Wright

2015

Int J of Appl Glass Sci

View full text Add to dashboard Cite

show abstract

“…With an x-value of 50, they ought to have all the boron atoms four-fold coordinated, whereas it is instead found experimentally that all the boron atoms are three-fold coordinated (Zachariasen, 1937;Zachariasen & Ziegler, 1932). Lithium metaborate (LIB02), however, does have a cristobalite type of modification (Lehman & Tiess, 1959), which consequently obeys equation (1).…”

Section: The Coordination Numbers Of Boronmentioning

confidence: 99%

“…Since a chain structure is known to occur in calcium metaborate, CaO.B~Oa (Zachariasen & Ziegler, 1932), it has been proposed by several workers that a corresponding double chain occurs in diborates such as dehydrated borax. (See for instance Azaroff, 1960, p. 425).…”

Section: Introductionmentioning

confidence: 99%

The crystal structure of lithium diborate, Li2O.2B2O3

Krogh-Moe¹

1962

Acta Cryst

212

View full text Add to dashboard Cite

Single crystals of lithium diborate, Li20.2B~Oa, have been synthesized and the crystal structure determined. The crystals belong to the space group I41cd, with unit-cell dimensions:a=9.47 A, c=10.26 A.An approximate set of atomic parameters was determined by trial-and-error methods, and the parameters were refined by calculating electron-density projections. The result shows that the borate anion consists of two three-dimensional interlocking networks, extending throughout the crystal. The basic unit of the networks is a group consisting of two boron atoms tetrahedrally coordinated by oxygen and two boron atoms triangularly coordinated by oxygen. The atoms in the group are arranged as a twisted double ring. This group is similar to one found as an isolated ion in borax, Na20.2B~O a. 10H20. Half of the boron atoms in lithium diborate are four-fold coordinated. This is shown to be consistent with a relationship valid for most borate structures. Two exceptions to this relationship are discussed.

show abstract

“…Since the 1930s when the first borate crystal structures were determined at room conditions ( [7][8][9] etc.) up to now, about a thousand crystal structures of borates have been resolved.…”

Section: Introductionmentioning

confidence: 99%

Strong anisotropic thermal expansion in borates

Бубнова¹,

Филатов

2008

Physica Status Solidi (b)

View full text Add to dashboard Cite

The paper summarizes results of high‐temperature single crystal X‐ray diffraction studies for six borate structures and high‐temperature powder X‐ray diffraction data for about 50 borates. The characteristics on thermal expansion of 50 borates of univalent, bivalent and trivalent metals of different dimensionality and anion structure are listed. The basic principles of high‐temperature borate crystal chemistry emerge from these studies and the regularities of borate thermal behavior are revealed. On heating the BO3 and BO4 polyhedra and rigid groups consisting of these polyhedra practically do not change their configuration and size but sometimes rotate like hinges exhibiting greatly anisotropic thermal expansion including linear negative expansion. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

show abstract

The Crystal Structure of Calcium Metaborate, CaB₂O₄

Cited by 23 publications

References 0 publications

My Borate Life: An Enigmatic Journey

My Borate Life: An Enigmatic Journey

The crystal structure of lithium diborate, Li2O.2B2O3

Strong anisotropic thermal expansion in borates

Contact Info

Product

Resources

About

The Crystal Structure of Calcium Metaborate, CaB2O4

Cited by 23 publications

References 0 publications

My Borate Life: An Enigmatic Journey

My Borate Life: An Enigmatic Journey

The crystal structure of lithium diborate, Li2O.2B2O3

Strong anisotropic thermal expansion in borates

Contact Info

Product

Resources

About

The Crystal Structure of Calcium Metaborate, CaB₂O₄