Phosphorus vapor pressures were measured over tin-phosphorus samples using two independent experimental techniques. Using an isopiestic method, data points were obtained between approximately 0 and 71 at.% P in the temperature interval from 618 to 998 K. Vapor pressures were also measured at lower temperatures over two two-phase fields, i. e. in (L + Sn4P3) between 559 and 677 K and in (Sn4P3 + Sn3P4) between 552 and 621 K, by a Knud-sen cell based mass loss technique. Based on these measurements partial thermodynamic properties and integral Gibbs energies were derived. The composition dependence of the phosphorus activity was also derived for three selected temperatures, 650, 700, and 750 K. Standard molar Gibbs energies of formation of Sn4P3,Sn3P 4 and SnP3 were determined and are given by: (equation Presented). © Carl Hanser Verlag GmbH & Co. KG.
Thermochemical investigations in the tin-phosphorus system / Rajesh, Ganesan; Ciccioli, Andrea; Gigli, Guido; Ipser, Herbert. - In: INTERNATIONAL JOURNAL OF MATERIALS RESEARCH. - ISSN 1862-5282. - STAMPA. - 102:1(2011), pp. 93-103. [10.3139/146.110451]
Thermochemical investigations in the tin-phosphorus system
CICCIOLI, Andrea;GIGLI, Guido;
2011
Abstract
Phosphorus vapor pressures were measured over tin-phosphorus samples using two independent experimental techniques. Using an isopiestic method, data points were obtained between approximately 0 and 71 at.% P in the temperature interval from 618 to 998 K. Vapor pressures were also measured at lower temperatures over two two-phase fields, i. e. in (L + Sn4P3) between 559 and 677 K and in (Sn4P3 + Sn3P4) between 552 and 621 K, by a Knud-sen cell based mass loss technique. Based on these measurements partial thermodynamic properties and integral Gibbs energies were derived. The composition dependence of the phosphorus activity was also derived for three selected temperatures, 650, 700, and 750 K. Standard molar Gibbs energies of formation of Sn4P3,Sn3P 4 and SnP3 were determined and are given by: (equation Presented). © Carl Hanser Verlag GmbH & Co. KG.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
