Готові списки джерел за темами / Electromotive composition

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Добірка наукової літератури з теми "Electromotive composition"

Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 31 травня 2022

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Статті в журналах з теми "Electromotive composition"

HIRATA, Yoshihiro, and Manabu MATSUDA. "Composition Dependence of Electromotive Force of Silica-Alumina Ceramics as Oxygen Solid Electrolyte." Journal of the Ceramic Society of Japan 102, no. 1183 (1994): 241–46. http://dx.doi.org/10.2109/jcersj.102.241.

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Kopyto, M., G. Garzel, and L. A. Zabdyr. "Thermodynamic properties of the liquid Bi-Cu-Sn lead-free solder alloys." Journal of Mining and Metallurgy, Section B: Metallurgy 45, no. 1 (2009): 95–100. http://dx.doi.org/10.2298/jmmb0901095k.

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The electromotive force measurement method was employed to determine the thermodynamic properties of liquid Bi-Cu-Sn alloys using solid electrolyte galvanic cells as shown below: Kanthal+Re, Bi-Cu-Sn, SnO2 | Yttria Stabilized Zirconia | air, Pt, Po2=0.2:1 atm Measurements were carried out for three cross-sections with constant Bi/Cu ratio equal to: 1/3, 1 and 3 and for various tin content varying every 10%, resulting in a total of 26 different alloy compositions. The temperature of the measurements varied within the range from 973 to 1325 K. A linear dependence of the e.m.f. on temperature was observed for all alloy compositions and the appropriate line equations were derived. Tin activities were calculated as function of composition and temperature. Results were presented in tables and figures.

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Ahmed, Soleen S., and Lazgin A. Jamil. "Determination of Dissociation Constants of Malonic Acid in (Ethylene Glycol-Water)X% Mixed Solvent at Different Temperatures Using Electromotive Force Measurements." Science Journal of University of Zakho 7, no. 1 (March 30, 2019): 18–26. http://dx.doi.org/10.25271/sjuoz.2019.7.1.573.

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The first and second dissociation constants of malonic acid in different composition of (ethylene glycol-water)%, (10, 20 and 30)% mixed solvent determined using the electromotive force measurements of galvanic cells without liquid junction at nine different temperatures, at interval, including the body temperature. The value of the first and second thermodynamic dissociation constants have been used to determine the thermodynamic quantities of two dissociation processes. These quantities involved the standard free energy, standard enthalpy change, standard entropy change, and standard heat capacity change.

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Mukhopadhyay, Sukanya, and K. T. Jacob. "Theoretical Analysis of the Electromotive Force of a Cell Incorporating a Composition Gradient Solid Electrolyte." Journal of The Electrochemical Society 142, no. 1 (January 1, 1995): 161–65. http://dx.doi.org/10.1149/1.2043857.

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Levkov, Leonid, Denis Pankratov, and Dmitry Shurygin. "Iron Oxidation State Analysis in ESR Slag." Materials Science Forum 946 (February 2019): 437–43. http://dx.doi.org/10.4028/www.scientific.net/msf.946.437.

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It is shown that the value of the equilibrium oxygen partial pressure,Po2as a value available for measurements is possible to be taken as a measure of slag redox potential of, taking into account its electronic system performance. Application of the electromotive force method (EMF) allowed establishing the character of a change in the average oxidation state of iron νFedepending onPo2, the temperature and slag composition. The study of Mössbauer absorption spectra of quenched slag samples confirmed the possibility of simultaneous presence of iron in the flux in oxidation states from 0 to +3.

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Katayama, Iwao, Keiko Shimazawa, Dragana Živković, Dragan Manasijević, Živan Živković, and Takamichi Iida. "Activity measurements of Ga in liquid Ga–Tl alloys by EMF method with zirconia solid electrolyte." International Journal of Materials Research 94, no. 12 (December 1, 2003): 1296–99. http://dx.doi.org/10.1515/ijmr-2003-0234.

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Abstract Electromotive force measurements (EMF) of an electrochemical cell with zirconia as solid electrolyte were performed to determine the Ga activity from 973 to 1273 K in the entire composition range of liquid Ga–Tl alloys. In the whole concentration range, the activity of Ga shows large positive deviations from ideality, and the activity of Tl which is derived by the Gibbs–Duhem equation shows also positive deviation from ideality. The parameters of the Redlich – Kister equation for excess Gibbs energies of mixing are determined from the results obtained in this study which were compared with Chou’s model calculation.

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Kurapova, O. Yu, M. M. Pivovarov, K. V. Nikiforova, and V. G. Konakov. "Sensor Properties of Stabilized Zirconia Ceramics, Manufactured from Nanopowders." REVIEWS ON ADVANCED MATERIALS SCIENCE 57, no. 2 (July 1, 2018): 257–61. http://dx.doi.org/10.1515/rams-2018-0071.

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Abstract The paper reports the data on the sensing properties of xCaO-(100-x)ZrO2 (CSZ, x=9, 12 and 15 mol.%) and 8Y2O3-92ZrO2 (YSZ) solid electrolytes, manufactured from nanosized lowagglomerated powder. Stabilized zirconia solid electrolytes (SE) were synthesized via the original co-precipitation technique and annealing at 1823K in air for 3 hours. Phase composition and conductivity of obtained ceramics was investigated via XRD and impedance spectroscopy techniques. Electromotive force (EMF) response on O2 partial pressure was obtained at 966K for sensors with stabilized zirconia membranes. The data obtained was compared with Nernst equation. The impact of the precursor powder synthesis technique on electrical and sensing properties was discussed.

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Garzel, G., M. Kopyto, and L. A. Zabdyr. "Thermodynamic properties of the liquid Ag-Bi-Cu-Sn lead-free solder alloys." Journal of Mining and Metallurgy, Section B: Metallurgy 50, no. 2 (2014): 145–48. http://dx.doi.org/10.2298/jmmb130727015g.

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The electromotive force measurement method was employed to determine the thermodynamic properties of liquid Ag-Bi-Cu-Sn alloys using solid electrolyte galvanic cells as shown below: Kanthal+Re, Ag-Bi-Cu-Sn, SnO2 | Yttria Stabilized Zirconia | air, Pt, Experiments were made within temperature interval: 950 - 1300K along four composition paths of constant ratios: XAg : XBi : XCu = 1, XAg : (XBi + XCu) = 3:2 for XBi = XCu, XBi : (XAg + XCu) = 3:2 for XAg = XCu and XCu : (XAg + XBi) = 3:2 for XAg = XBi and tin concentration changing from 0.1 to 0.9 mole fractions, every 0.1. Almost all the results were approximated by straight line equations: EMF vs T, and tin activities were then calculated in arbitrary temperature; measurement results were presented by graphs. Unusual activity plot for XBi : (XAg + XCu) = 3:2 composition path was most probably caused by miscibility gap detected earlier in Bi-Cu-Sn ternary liquid alloys.

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Jacob, K. Thomas, Niladri Dasgupta, Helfried Näfe, and Fritz Aldinger. "Measurement of Gibbs energy of formation of LaGaO3 using a composition-graded solid electrolyte." Journal of Materials Research 15, no. 12 (December 2000): 2836–43. http://dx.doi.org/10.1557/jmr.2000.0405.

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A composition-graded solid electrolyte (LaF3)y · (CaF2)1-y was used for the measurement of the standard Gibbs energy of formation of LaGaO3 from its component oxides. An equimolar mixture of CaO and CaF2 was employed as the reference electrode. The composition of the working electrode depended on temperature. A three-phase mixture of LaGaO3 + Ga2O3 + LaF3 was used in the temperature range from 910 to 1010 K, while a mixture of LaGaO3 + Ga2O3 + LaO1-xF1+2x was employed from 1010 to 1170 K. Both the reference and working electrodes were placed under pure oxygen gas. Because of the high activity of LaF3 at the working electrode, there was significant diffusion of LaF3 into CaF2. The composition-graded electrolyte was designed to minimize the electrode–electrolyte interaction. The concentration of LaF3 varied across the solid electrolyte; from y = 0 near the reference electrode to a maximum value y = 0.32 at the working electrode. For the correct interpretation of the electromotive force at T > 1010 K, it was necessary to use thermodynamic properties of the lanthanum oxyfluoride solid solution. The standard Gibbs energy of formation of LaGaO3 from its component oxides according to the reaction, ½La2O3 (A-rare earth) + ½Ga2O3 (b) → LaGaO3 (rhombohedral) can be represented by the equation: δGo f,(ox) /J mol -1 = –46 230 + 7.75 T/K (±1500).

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Moroz, Mykola, Fiseha Tesfaye, Pavlo Demchenko, Myroslava Prokhorenko, Nataliya Yarema, Daniel Lindberg, Oleksandr Reshetnyak, and Leena Hupa. "The Equilibrium Phase Formation and Thermodynamic Properties of Functional Tellurides in the Ag–Fe–Ge–Te System." Energies 14, no. 5 (February 28, 2021): 1314. http://dx.doi.org/10.3390/en14051314.

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Equilibrium phase formations below 600 K in the parts Ag2Te–FeTe2–F1.12Te–Ag2Te and Ag8GeTe6–GeTe–FeTe2–AgFeTe2–Ag8GeTe6 of the Fe–Ag–Ge–Te system were established by the electromotive force (EMF) method. The positions of 3- and 4-phase regions relative to the composition of silver were applied to express the potential reactions involving the AgFeTe2, Ag2FeTe2, and Ag2FeGeTe4 compounds. The equilibrium synthesis of the set of phases was performed inside positive electrodes (PE) of the electrochemical cells: (−)Graphite ‖LE‖ Fast Ag+ conducting solid-electrolyte ‖R[Ag+]‖PE‖ Graphite(+), where LE is the left (negative) electrode, and R[Ag+] is the buffer region for the diffusion of Ag+ ions into the PE. From the observed results, thermodynamic quantities of AgFeTe2, Ag2FeTe2, and Ag2FeGeTe4 were experimentally determined for the first time. The reliability of the division of the Ag2Te–FeTe2–F1.12Te–Ag2Te and Ag8GeTe6–GeTe–FeTe2–AgFeTe2–Ag8GeTe6 phase regions was confirmed by the calculated thermodynamic quantities of AgFeTe2, Ag2FeTe2, and Ag2FeGeTe4 in equilibrium with phases in the adjacent phase regions. Particularly, the calculated Gibbs energies of Ag2FeGeTe4 in two different adjacent 4-phase regions are consistent, which also indicates that it has stoichiometric composition.

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Дисертації з теми "Electromotive composition"

Рябов, Євген Сергійович. "Безредукторний тяговий привод на основі реактивного індукторного двигуна з аксіальним магнітним потоком для швидкісного електрорухомого складу". Thesis, СПДФО Миронов М. В, 2011. http://repository.kpi.kharkov.ua/handle/KhPI-Press/5307.

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Дисертацію присвячено розробці наукових проектування безредукторного тягового приводу на основі реактивного індукторного двигуна з аксіальним магнітним потоком для швидкісного електрорухомого складу. Запропоновано створення безредукторного тягового приводу на основі реактивного індукторного двигуна з аксіальним магнітним потоком. Розроблено математичну модель для визначення електромагнітного моменту реактивного індукторного двигуна з аксіальним магнітним потоком. Розроблено узагальнену імітаційну модель тягового приводу, що досліджується, яка поєднує модель напівпровідникового перетворювача у сукупності з системою керування приводом та модель реактивного індукторного двигуна з аксіальним магнітним потоком. Розроблено модель крутильних коливань в механічній частині приводу. Запропонована методика оцінки енергетичних показників досліджуваного тягового приводу. У сукупності запропоновані моделі покладені в основу програмно-алгоритмічного комплексу проектування тягового безредукторного приводу на основі реактивного індукторного двигуна з аксіальним магнітним потоком. Розроблений концептуальний проект швидкісного електропоїзду, тяговий привод якого синтезований за допомогою вищезазначеного програмно-алгоритмічного комплексу та визначені його робочі властивості та показники
The thesis is dedicated to the working out of scientific bases of creation gearless traction drive based on transverse switched reluctance motor for speed electrical rolling stock in terms of linking its properties and working parameters. By analyzing of the force and power parameters of traction electric motors, used in the gearless traction drive, and comparing the performances of structural mechanisms to transfer torque suggested the creation of gearless traction drive based on the jet engine based on the inductor axial magnetic flux. The mathematical model for the electromagnetic torque inductor jet engine axial magnetic flux is worked out. The generalized traction drive simulation model that is studied, combines semiconductor transducer model, is coupled with the drive system and inductor model of transverse switched reluctance motor, which is based on mathematical model. The model of torsion oscillations of the mechanical drive is worked out. Method for energy parameters investigated traction drive is proposed. Together, the proposed model algorithmic complex design of the direct drive traction based on transverse switched reluctance motor. The conceptual design of high-speed electric trains is worked out. Traction drive is synthesized using the above algorithmic complex and determined its performance and indicators

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Частини книг з теми "Electromotive composition"

Kosuge, Koji. "Examples of the Practical Use of Non-Stoichiometric Compounds." In Chemistry of Non-stoichiometric Compounds. Oxford University Press, 1994. http://dx.doi.org/10.1093/oso/9780198555551.003.0006.

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In this chapter, we describe four kinds of non-stoichiometric compound, which are or will be in practical use, from the viewpoint of preparation methods or utility. As a first example, the solid electrolyte (ZrO2)0.85(CaO)0.15 is described, which are discussed in Sections 1.4.6–1.4.8 from the viewpoint of basic characteristics. The second example is the magnetic material Mn–Zn ferrite, for which the control of non-stoichiometry and the manufacturing process will be described. Then the metal hydrides or hydrogen absorbing alloys, which are one of the most promising materials for storing and transporting hydrogen in the solid state, are described, mainly focusing on the phase relation. Finally, we describe the relation between the control of composition and the growth of a single crystal of the semiconductive compound GaAs, which is expected to give electronic materials for 1C and LSI etc. Solid electrolytes, which show ionic conductivity in the solid state, are considered to be potential materials for practical use, some are already used as mentioned below. Solid electrolytes have characteristic functions, such as electromotive force, ion selective transmission, and ion omnipresence. Here we describe the practical use of calcia stabilized zirconia (CSZ), (ZrO2)0.85(CaO)0.15, the structure and basic properties of which are discussed in detail in Sections 1.4.5–1.4.8. The most simple practical application of CSZ is for the gauge of oxygen partial pressure, as mentioned in Sections 1.4.7 and 1.4.8. The oxygen partial pressure P2o2 in the closed system as shown in Fig. 3.1 can be measured, taking the air as the standard oxygen pressure P1o2. The electromotive force (EMF) of this concentration cell is expressed as . . . E = (RT/4F)ln(P1o2/ P2o2) . . . This principle is applied in the measurement of oxygen partial pressure in laboratory experiments and of the oxygen activity of slag in refineries. Based on the principle of coulometric titration (see Section 1.4.8), the oxygen partial pressure of a closed system can be kept constant by feedback of the EMF, in the oxygen pressure range 1 to 10−7 atm. By use of this closed system, investigations on redox reactions of metals and also enzyme reactions have been carried out.

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Maxim, Florentina, Alina Botea-Petcu, Florina Teodorescu, Ludwig J. Gauckler, and Speranta Tanasescu. "Thermodynamic Stability and Microscopic Behavior of BaxSr1-xCo1-yFeyO3-δ Perovskites." In Structure Processing Properties Relationships in Stoichiometric and Nonstoichiometric Oxides. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.94028.

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The mixed conducting perovskite-type oxides BaxSr1-xCo1-yFeyO3-δ (BSCF) are intensively studied as potential high-performance solid oxide fuel cell cathode materials. The effect of different compositional variables and oxygen stoichiometry on the structure and thermodynamic stability of the BaxSr1-xCo1-yFeyO3-δ (x = 0.2, 0.4, 0.5, 0.6, 0.8; y = 0.2, 0.4, 0.6, 0.8, 1) perovskite-type compositions were investigated by solid electrolyte electrochemical cells method and scanning electron microscopy (SEM). The thermodynamic quantities represented by the partial molar free energies, enthalpies and entropies of oxygen dissolution in the perovskite phase, as well as the equilibrium partial pressures of oxygen were obtained in the temperature range of 823–1273 K. The in situ change of oxygen stoichiometry and the determination of thermodynamic parameters of the new oxygen-deficient BSCF compositions were studied via coulometric titration technique coupled with electromotive force (EMF) measurements. The effect of A- and B-site dopants concentration correlated to the variation of oxygen stoichiometry on the thermodynamic stability and morphology of the BSCF samples was evidenced.

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