Page 1. Anal. Chem. 1993, 85, 2899-2902 2899 Preparation and Certification of a Rhodium Standard ... more Page 1. Anal. Chem. 1993, 85, 2899-2902 2899 Preparation and Certification of a Rhodium Standard Reference Material Solution Charles M. Beck 11,' Marc L. Salit, Robert L. Watters, Jr., Therese A. Butler, and Laura J. Wood ...
Flourine bomb calorimetric measurements of the massic energy of the reaction: Si3N4(cr, α- or β-)... more Flourine bomb calorimetric measurements of the massic energy of the reaction: Si3N4(cr, α- or β-) + 6F2(g) = 3SiF4(g) + 2N2(g) have shown that, within the combined uncertainties of the experiments, there is a negligible enthalpy difference between the α- and β-forms of Si3N4at the temperature 298.15 K. The standard molar enthalpies of formation atT=298.15 K have been determined: ΔfHmo(α-
Two fully characterized specimens of pentatungsten trisilicide, nominally W5Si3, one believed to ... more Two fully characterized specimens of pentatungsten trisilicide, nominally W5Si3, one believed to have been prepared by direct reaction of the elements in a sealed tube, and the other by are melting, have been studied by fluorine-combustion calorimetry. Chemical analyses of the samples played a pivotal role in this work, and their effects on the results are discussed in detail. The
The massic (formerly called specific) energies of combustion in fluorine of two different specime... more The massic (formerly called specific) energies of combustion in fluorine of two different specimens of trimolybdenum monosilicide have been measured in a bomb calorimeter and the standard molar enthalpy of formation ΔfHmo(Mo3Si, cr, 298.15 K) determined to be −(125.2 ± 5.8) kJ ·mol−1. A critical evaluation of the thermodynamic properties of Mo3Si is also presented, and recommended values for the
The standard molar enthalpy of formation ΔfHmoof pentamolybdenum trisilicide Mo5Si3has been deter... more The standard molar enthalpy of formation ΔfHmoof pentamolybdenum trisilicide Mo5Si3has been determined by fluorine combustion calorimetry to be −(314.3 ± 8.3) kJ·mol−1atT= 298.15 K andpo= 101.325 kPa. Conventional thermodynamic properties of Mo5Si3are tabulated toT= 2100 K. Thermodynamic quantities to the same temperature maximum are also given for the high-temperature oxidation reactions: 2MoSi2(s) + 702(g) = 2MoO3(s) + 4SiO2(s), and 5MoSi2(s)
A solution-based inductively coupled plasma optical emission spectrometric (ICP-OES) method is de... more A solution-based inductively coupled plasma optical emission spectrometric (ICP-OES) method is described for elemental analysis with relative expanded uncertainties on the order of 0.1% relative. The single-element determinations of 64 different elements are presented, with aggregate performance results for the method and parameters for the determination of each element. The performance observed is superior to that previously reported for ICP-OES, resulting from a suite of technical strategies that exploit the strengths of contemporary spectrometers, address measurement and sample handling noise sources, and permit rugged operation with small uncertainty. Taken together, these strategies constitute high-performance ICP-OES.
Page 1. Anal. Chem. 1993, 85, 2899-2902 2899 Preparation and Certification of a Rhodium Standard ... more Page 1. Anal. Chem. 1993, 85, 2899-2902 2899 Preparation and Certification of a Rhodium Standard Reference Material Solution Charles M. Beck 11,' Marc L. Salit, Robert L. Watters, Jr., Therese A. Butler, and Laura J. Wood ...
Flourine bomb calorimetric measurements of the massic energy of the reaction: Si3N4(cr, α- or β-)... more Flourine bomb calorimetric measurements of the massic energy of the reaction: Si3N4(cr, α- or β-) + 6F2(g) = 3SiF4(g) + 2N2(g) have shown that, within the combined uncertainties of the experiments, there is a negligible enthalpy difference between the α- and β-forms of Si3N4at the temperature 298.15 K. The standard molar enthalpies of formation atT=298.15 K have been determined: ΔfHmo(α-
Two fully characterized specimens of pentatungsten trisilicide, nominally W5Si3, one believed to ... more Two fully characterized specimens of pentatungsten trisilicide, nominally W5Si3, one believed to have been prepared by direct reaction of the elements in a sealed tube, and the other by are melting, have been studied by fluorine-combustion calorimetry. Chemical analyses of the samples played a pivotal role in this work, and their effects on the results are discussed in detail. The
The massic (formerly called specific) energies of combustion in fluorine of two different specime... more The massic (formerly called specific) energies of combustion in fluorine of two different specimens of trimolybdenum monosilicide have been measured in a bomb calorimeter and the standard molar enthalpy of formation ΔfHmo(Mo3Si, cr, 298.15 K) determined to be −(125.2 ± 5.8) kJ ·mol−1. A critical evaluation of the thermodynamic properties of Mo3Si is also presented, and recommended values for the
The standard molar enthalpy of formation ΔfHmoof pentamolybdenum trisilicide Mo5Si3has been deter... more The standard molar enthalpy of formation ΔfHmoof pentamolybdenum trisilicide Mo5Si3has been determined by fluorine combustion calorimetry to be −(314.3 ± 8.3) kJ·mol−1atT= 298.15 K andpo= 101.325 kPa. Conventional thermodynamic properties of Mo5Si3are tabulated toT= 2100 K. Thermodynamic quantities to the same temperature maximum are also given for the high-temperature oxidation reactions: 2MoSi2(s) + 702(g) = 2MoO3(s) + 4SiO2(s), and 5MoSi2(s)
A solution-based inductively coupled plasma optical emission spectrometric (ICP-OES) method is de... more A solution-based inductively coupled plasma optical emission spectrometric (ICP-OES) method is described for elemental analysis with relative expanded uncertainties on the order of 0.1% relative. The single-element determinations of 64 different elements are presented, with aggregate performance results for the method and parameters for the determination of each element. The performance observed is superior to that previously reported for ICP-OES, resulting from a suite of technical strategies that exploit the strengths of contemporary spectrometers, address measurement and sample handling noise sources, and permit rugged operation with small uncertainty. Taken together, these strategies constitute high-performance ICP-OES.
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