The Analysis of Refractory Borides, Carbides, Nitrides, and Silicides

Kriege, Owen H.

doi:10.2172/4214604

Cited by 8 publications

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“…Boron was determined by the differential titration method of Frank (9) modified by the use of BaCG3 instead of CaC03 in the separation procedure. Total zirconium and hafnium contents were determined gravimetrically by the method of Kriege (20). The appropriate gravimetric factor was determined experimentally by the use of high-purity (99.95%) zirconium metal as a standard.…”

Section: Methodsmentioning

confidence: 99%

“…X-ray powder diffraction analysis showed hexagonal zirconium diboride as well as faint lines which could be ascribed to cubic ZrC. Uncombined carbon was sought by the dissolution method of Kriege (20), but none was found. These observations, together with the nature of the reported high-temperature phase diagrams (29), le$i us to assume that all the carbon (plus the minor amounts of oxygen and nitrogen) in the specimens was present in the cubic phase as (Zr,Hf) (0,C,N).…”

Section: Methodsmentioning

confidence: 99%

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Fluorine bomb calorimetry. Enthalpies of formation of the diborides of ziconium and hafnium

Johnson¹,

Greenberg²,

Margrave³

et al. 1967

J. Chem. Eng. Data

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per mole-has been combined (4) with this AH? and that for S04"2(aq.) from NBS Circ. 500 (10) to yield AH? = -13.9 kcal. per mole for Co*2(aq.). Subsequent publication of part of the successor to NBS Circ. 500 by Wagman et al. ( 11) suggests that these calculations should be revised to conform with new data for sulfuric acid and sulfate ion. These calculations yield AH? = -212.55 kcal. per mole for CoS04(c.), which is then combined with the AH0 of solution of CoS04(c.) and the new AH? for S04'2(aq.) to yield AH? = -14.0 kcal. per mole for Co+2(aq.). Combination of this AH? with the previously reported Si gives AG? = -13.4 kcal. per mole for Co+2(aq.).Combination of our aH°with the AH? cited above for

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Fluorine bomb calorimetry. Enthalpies of formation of the diborides of ziconium and hafnium

Johnson¹,

Greenberg²,

Margrave³

et al. 1967

J. Chem. Eng. Data

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show abstract

“…Boron was determined by the differential titration method of Frank (9) modified by the use of BaCOa instead of CaC03 in the separation procedure. The major components, niobium and tantalum, were assayed by the gravimetric method of Kriege (21) with the following results: Nb, 82.2%; Ta, 89.3%. However, because of large uncertainties (~0.6%) in these analyses, it was thought preferable to calculate the amount of the major component by difference.…”

Section: Methodsmentioning

confidence: 99%