The Heat of Formation of Aluminum Borohydride<sup>1,2</sup>

Rulon, Richard M.; Mason, L. S.

doi:10.1021/ja01155a558

Cited by 11 publications

(8 citation statements)

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“…They have been shown to form with alkali and alkaline-earth elements, various transition metals, and with aluminum. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] In general, the number of BH 4 groups per metal atom reflects the valency of the cation. Recently, the tetrahydroborates have been studied intensively because of their high gravimetric hydrogen content, which makes them potential hydrogen storage materials.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, the tetrahydroborates have been studied intensively because of their high gravimetric hydrogen content, which makes them potential hydrogen storage materials. 15 In the simplest picture, the tetrahydroborates can be thought of as ionic solids with metal cations and BH 4 − anions that are semicovalently bound molecular units. The valence electrons from the metal are transferred to the BH 4 groups which then have a sufficient number of electrons to fill an eight-electron closed-shell configuration.…”

Section: Introductionmentioning

confidence: 99%

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Binding in alkali and alkaline-earth tetrahydroborates: Special position of magnesium tetrahydroborate

Łodziana

Setten

2010

Phys. Rev. B

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Compounds of light elements and hydrogen are currently extensively studied due to their potential application in the field of hydrogen or energy storage. A number of new interesting tetrahydroborates that are especially promising due to their very high gravimetric hydrogen content were recently reported. However, the determination and understanding of their complex crystalline structures has created considerable debate. Metal tetrahydroborates, in general, form a large variety of structures ranging from simple for NaBH 4 to very complex for Mg͑BH 4 ͒ 2 . Despite the extensive discussion in the literature no clear explanation has been offered for this variety so far. In this paper we analyze the structural and electronic properties of a broad range of metal tetrahydroborates and reveal the factors that determine their structure: ionic bonding, the orientation of the BH 4 groups, and the coordination number of the metal cation. We show, in a simple way, that the charge transfer in the metal tetrahydroborates rationally explains the structural diversity of these compounds. Being ionic systems, the metal tetrahydroborates fall into the classification of Linus Pauling. By using the ionic radius for the BH 4 group as determined in this paper, this allows for structural predictions for new and mixed compounds.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Binding in alkali and alkaline-earth tetrahydroborates: Special position of magnesium tetrahydroborate

Łodziana

Setten

2010

Phys. Rev. B

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“…The sample Investigated by Anderson [ 2 ] was natural quartz of particle sizes between 28 [20], using data obtained by Anderson [ 2 ], Nernst [3l], and Wietzel [53], calculated S^ng = 10.00 10.10 eu. Westrum [ 5 ] lists as unpublished measurements on uhe heat capacity of a-quartz in the range 6°t o 300°K.…”

Section: !Yomentioning

confidence: 99%

“…Measurements of the heat capacity of potassium metal have been reported by Schiiz [39] (-79°to 0°C) ; Koref [23] (-191°to 0°C) ; Dewar [9] (20°to 80°K) ; Eastman and Rode bush [lO] (68°to 287°K) ; Simon and Zeidler [43] (l5°to 277°K) j Carpenter and Steward [6] ( 203°to 610°K) j Dauphinee, Martin, and Preston-Thomas [8] (30°to 330°K) ; Krier, Craig and Wallace [ 24 ] (H°to 323°K) j Roberts [ 36 ] (l.5°to 20°K) j and Lien and Phillips [28] (0.17°to 1.1°K). The results of Dauphinee et aj.. [8], Krier et aJ.. [24] > and Roberts [ 36 ] are in close agreement.…”

Section: !Yomentioning

confidence: 99%

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Preliminary report on the thermodynamic properties of selected light-element and some related compounds:

1962

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This is the seventh semi-annual report on the current experimental, theoretical, and evaluative program, at the National Bureau of Standards, on the thermodynamic properties of selected light-element compounds of primary interest in high-temperature research. In this connection the chemical elements principally involved are H, Li, Be, B, C, N, 0, F, At, Cl, and Zr, with more secondary interest in the compounds of Mg, Si, K, Ti, Br, I, W, Hg, and Pb. The emphasis in the NBS work has been on the simpler compounds of these elements.This report includes some recent NBS measurements under the program: The heat of formation of nitronium perchlorate, and the high-temperature heat capacity of aluminum carbide. As discussed in the report, precise measurements are essentially completed on the heat of combustion of aluminum in fluorine and on the low-temperature heat capacities and absolute entropies of LiH, and LiAlH^; however, these data are not yet presented, pending the resolution of small discrepancies needed to put the results on a final basis. Tables of thermodynamic functions are given for four gases omitted from earlier reports (H 2 > 02> H , and electron gas), and, on the basis of improved data, for the condensed phases of two substances (BeF 2 and At^C^) . A contribution from those areas in which elaborate apparatus development is still progressing is a description in the report of a new fast-opening large-aperture shutter for high-speed photography. This development will be important in the study of combustions at very high temperatures and pressures.Also included are several up-to-date literature surveys in the field.One describes recent additions to the literature on the chemistry of numerous light-element compounds. A second describes alloys and intermetallic compounds of aluminum and beryllium with titajaium and zirconium; while a third survey covers low-temperature heat capacities aud entropies of various substances, particularly the oxides of eight light elements. The fourth report is a comprehensive and critical assembly of the available values for the heats of formation of a large number of compounds. IntroductionNitronium perchlorate is a v;hite, crystalline material, stable at temperatures up to 120°C. It is extremely hygroscopic, reacting rapidly with water to form nitric and perchloric acids. Aqueous solutions of potassium hydroxide were used in this investigation, as the potassium salts of the acids provided more suitable reference substances. The heats of solution of KN0_(c) and KClO/c) in KOH(aq) were also determined. Constants and Conversion FactorsThe results of this investigation are given in joules and calories, with 1 cal = 4*1840 joules. All weights are corrected to vacuum. The molecular weights are calculated from the 1957 International Table of Atomic Weights [l]. For N02C10/(c) an estimated heat capacity of 36 cal/deg mole was used; other auxiliary data were taken where possible from [2].3. MaterialsThe KNO^(c) and KC10/(c) were reagent-grade materials, dried at 120°...

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Metal Tetrahydroborates

James

Wallbridge

1970

Progress in Inorganic Chemistry

122

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The Heat of Formation of Aluminum Borohydride^1,2

Cited by 11 publications

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Binding in alkali and alkaline-earth tetrahydroborates: Special position of magnesium tetrahydroborate

Binding in alkali and alkaline-earth tetrahydroborates: Special position of magnesium tetrahydroborate

Preliminary report on the thermodynamic properties of selected light-element and some related compounds:

Metal Tetrahydroborates

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The Heat of Formation of Aluminum Borohydride1,2

Cited by 11 publications

References 0 publications

Binding in alkali and alkaline-earth tetrahydroborates: Special position of magnesium tetrahydroborate

Binding in alkali and alkaline-earth tetrahydroborates: Special position of magnesium tetrahydroborate

Preliminary report on the thermodynamic properties of selected light-element and some related compounds:

Metal Tetrahydroborates

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Product

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The Heat of Formation of Aluminum Borohydride^1,2