Evaluation of Knudsen Measurements of the Sublimation of Manganese(II) Selenide

Wiedemeier, H.; Goyette, William J.

doi:10.1063/1.1669556

Cited by 12 publications

(3 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…where a is the degree of dissociation of Se~(g). Wiedemeier and Goyette (13) have developed a calculational technique to compute a for this type of reaction from Knudsen data and the dissociation energy of the chalcogen species. With a dissociation energy for Se2 (g) of 75.7 kcal/mole (14) and with experimental data of the CdSe sublimation to be presented later, a was found to be less than 0.1% over the entire temperature range of this investigation.…”

Section: Solid-gas Phase Equilibriamentioning

confidence: 99%

Solid-Gas Phase Equilibria and Thermodynamic Properties of Cadmium Selenide

Sigai

Wiedemeier²

1972

J. Electrochem. Soc.

Self Cite

View full text Add to dashboard Cite

The investigation of the solid-gas phase equilibrium of CdSe revealed that at about 400~ CdSe sublimes initially by losing selenium to form nonstoichiometric CdSet-z, where x ~ 0.002; the resulting compound CdSel-x sublimes congruently. Since existing thermodynamic data for CdSe are either incomplete or show significant differences, the high-temperature thermodynamic properties of CdSe were reinvestigated using the Knudsen effusion technique.With the heat capacity function for CdSe (s) (C~ : 12.36 + 1.45 • 10 -3 T eu [320~176 measured for the first time in this work and with tabulated thermochemical data, the vapor pressure measurements were evaluated in terms of the standard heat of formation [~H~ = --35.7 -~ 1.0 kcal/mole (third-law evaluation)] and the absolute entropy [S~ = 19.6 _ 1.2 eu (second-law evaluation)] of CdSe(s). Previous investigations are reviewed and compared with present results.Several investigations of the mode of vaporization (1-3) and high-temperature thermodynamic properties (1, 4-8) of CdSe have been performed because of its potential use in solid-state devices and their importance for the growth of single crystals from the vapor phase. However, the precise mode of vaporization of CdSe is still uncertain and existing thermodynamic data are incomplete or show significant discrepancies. An experimentally determined heat capacity function of CdSe has not been reported prior to this work.A knowledge of the equilibrium vapor pressure of CdSe is important since earlier investigations of CdSe (9-11) and other II-VI compounds (12) have demonstrated that these types of materials generate native point defects which are electrically active and play a substantial role in determining the electrical and optical properties of these compounds. Therefore, it is essential to define the conditions of preparation and any subsequent treatment of the specimen with respect to the equilibrium partial pressures of the components for a reliable interpretation of electrical and optical measurements. Solid-Gas Phase EquilibriaGeneral form of vaporization reaction.--Mass spectrometric data (1) and vaporization studies on CdSe in the presence of excess elemental Cd or Se in the gas phase (7) indicate that CdSe(g) and higher molecular weight species than Se2(g) are negligible under present experimental conditions. Therefore, the congruent sublimation of CdSe can be described by the reactionwhere a is the degree of dissociation of Se~(g). Wiedemeier and Goyette (13) have developed a calculational technique to compute a for this type of reaction from Knudsen data and the dissociation energy of the chalcogen species. With a dissociation energy for Se2 (g) of 75.7 kcal/mole (14) and with experimental data of the CdSe sublimation to be presented later, a was found to be less than 0.1% over the entire temperature range of this investigation. Therefore, monatomic cadmium and diatomic selenium are the only predominant species in the gas phase. This is in agreement with earlier mass spectrometric work (1). Congruency o] cadmiu...

show abstract

Section: Solid-gas Phase Equilibriamentioning

confidence: 99%

Solid-Gas Phase Equilibria and Thermodynamic Properties of Cadmium Selenide

Sigai

Wiedemeier²

1972

J. Electrochem. Soc.

Self Cite

View full text Add to dashboard Cite

show abstract

“…It is very simple and easy for one to determine the BDE of the molecule, the bond energy of the cation, or the IE of the molecule by using equation (2) if IE(M) and D 0 (M + −X). There are several methods known for the calculation of BDEs such as threshold‐based value (TBV), predissociation‐based value (PBV), velocity map imaging‐based value (VMIBV), Knudsen effusion‐mass spectroscopy (KEMS), potential curve extrapolation‐based value (PCEBV), mass spectroscopy‐based value (MSBV), inductively‐coupled plasma/selected‐ion flow tube (ICP/SIFT), multireference configuration interaction (MRCI) approach/ complete‐active‐space self‐consistent‐field (CASSCF) wave functions and extensive basis sets, computational theories like ab‐initio Hartree‐Fock (HF) and configuration interaction (CI) and density functional theory (DFT) method, Complete‐active space self‐consistent‐field (CASSCF)// complete‐active space second‐order perturbation theory (CASPT2) and quasi‐relativistic Douglas‐Kroll (No‐pair) spin averaged approximation (QDKS) as shown in Table S1 [35–85] …”

Section: Principles Of the Synthesis Of Icncs Via Cers/aersmentioning

confidence: 99%

Recent Progress in Synthesis of Nanostructures through Ion Exchange Route and their Applications

Singh

2023

ChemistrySelect

View full text Add to dashboard Cite

The inorganic colloidal nanocrystals (ICNCs) have received a great deal of interest because of their tunable electronic and optical properties with coarse and finely controlled compositions, morphologies and thus, hybrid nanostructures have a wide range of applications in supercapacitor, luminescent solar concentrators (LSCs) and photothermal therapy (PPT). The ion exchange (IEx) process includes great diffusion rates of parent nanoparticles (NPs) ions from their crystal structure and their complete dissociation in specific solvents. The bond dissociation energies (BDEs) of different transition metal atoms with specific p‐block elements have been reviewed to analyze their effect on the IEx process. The alloy and doped and inorganic perovskite ICNCs have been synthesized via different IEx methodologies, showing varied photoluminescence quantum yields (PLQYs), nano‐dimensional morphology, composition, reaction time and temperature, and their performance for a specific application have been tabulated. The perovskite nanocrystals (NCs) are responsible for fast IEx dynamics that drop to homogenization in their composition, leading to NCs emitting in a narrow spectral region acting as an intermediate between those of the model NPs. The nanoscale metal‐organic particles (NMOPs) have opened plausible opportunities for their application in nanomedicine having highly enriched functionalities, well‐designed shapes/sizes, adjustable compositions, and intrinsic biodegradability. The potential to develop well‐designed heterostructures and for the growth of large‐area monocrystalline CsPbBr3 thin films provide a strong base for fundamental investigations of the intrinsic properties of perovskite‐based devices. The Cs3Sb2I9 is an active emitter layer that directs us toward low‐dimensional lead‐free A3B2X9 perovskite optoelectronic materials.

show abstract

“…Анализ литературных данных показывает, что первые исследования термодинамических свойств теллуридов марганца, начатые в конце 19 века, и данные, полученные как экспериментальными (калориметрия, измерение давления пара, метод ЭДС), так и расчетными методами, собраны в современных справочниках и электронных базах данных [21][22][23][24][25][26][27][28][29][30][31]. Следует отметить, что все предыдущие исследования, в том числе проведенные методом ЭДС выполнялись в высокотемпературных диапазонах.…”

Section: Introductionunclassified

Thermodynamic study of manganese tellurides by the electromotive force method

Orujlu

Aliev

Jafarov

et al. 2021

kcmf

View full text Add to dashboard Cite

The thermodynamic properties of manganese tellurides were determined using an electromotive force (EMF) method with a liquid electrolyte in a temperature range from 300 to 450 K. EMF measurements were performed using equilibrium samples taken from the two-phase regions, namely MnTe2 + Te and MnTe + MnTe2, of the Mn–Te system. The phase compositions of all samples were controlled with the X-ray diffraction (XRD) method. The partial molar functions of manganese in alloys, as well as the standard thermodynamic functions of the formation and standard entropies of MnTe and MnTe2, were calculated. A comparative analysis of obtained results with literature data is performed

show abstract

Evaluation of Knudsen Measurements of the Sublimation of Manganese(II) Selenide

Cited by 12 publications

References 17 publications

Solid-Gas Phase Equilibria and Thermodynamic Properties of Cadmium Selenide

Solid-Gas Phase Equilibria and Thermodynamic Properties of Cadmium Selenide

Recent Progress in Synthesis of Nanostructures through Ion Exchange Route and their Applications

Thermodynamic study of manganese tellurides by the electromotive force method

Contact Info

Product

Resources

About