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- Osadchii, E, et al.
(author)
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Thermodynamic properties of dyscrasite (Ag3Sb) at isostatic pressures 4000-8000 bar
- 1998
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In: Physics and chemistry of minerals. - 0342-1791 .- 1432-2021. ; 25:4, s. 288-291
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Journal article (peer-reviewed)abstract
- The objective of the present study was to demonstrate the possibility of application of high-pressure equipment in combination with the solid state EMF technique. The equilibrium reaction 3 Ag+Sb double left right arrow Ag3Sb was chosen for the studies. The experiments were carried out under argon gas pressure and the majority of data points were measured in the pressure range 4000-8000 bar at temperatures 550-725 K. The solid electrolyte consisted of AgI. Reproducible results were obtained along seven isotherms and one isobar at 7100 bar. The molar volume change for the reaction studied was calculated and compared with corresponding literature data at one bar.
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| 2. |
- Huang, J H, et al.
(author)
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Phase relations and activities of (Mn,Ni)-olivine solid solution in the ternary system MnO-NiO-SiO2
- 1996
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In: Acta Chemica Scandinavica. - 0904-213X .- 1902-3103. ; 50:12, s. 1102-1107
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Journal article (peer-reviewed)abstract
- Phase relations involving tie-lines between (Mn, Ni)O and (Mn, Ni)(2)SiO4 solid solutions in the ternary system MnO-NiO-SiO2 have been studied experimentally at 1310 K. A great number of mixtures, with various constitutions, were equilibrated and the compositions of coexisting solid-solution phases were determined by inductively coupled plasma (ICP) analysis as well as X-ray d-spacing measurements. The olivine phase (Mn-1-y,Ni-y)(2)SiO4 and SiO2 occur together at compositions 0.27 less than or equal to y less than or equal to 1, and the pyroxene phase (Mn-1-z, Ni-z)SiO3 exists only in the composition range 0 less than or equal to z less than or equal to 0.08. The activities in the (Mn, Ni)-olivine solid solution were derived from the tie-line data obtained at 1310 K. By using the solid-state EMF method, the activities of Ni-olivine solid solution were also determined at several compositions, 0.27 less than or equal to y less than or equal to 1, in the temperature range 1140-1395 K. The activities obtained from both methods show significant positive deviations from ideality.
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