Differential Thermal Analysis Studies on the Crystallization of Strontium Tungstate from Sodium Tungstate Melts Thermodynamic and Kinetic Parameters | Zendy

Roy B. N. | Zendy

Premium

Differential Thermal Analysis Studies on the Crystallization of Strontium Tungstate from Sodium Tungstate Melts Thermodynamic and Kinetic Parameters

Author(s) -

Roy B. N.

Publication year - 1981

Publication title -

kristall und technik

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.377

H-Index - 64

eISSN - 1521-4079

pISSN - 0023-4753

DOI - 10.1002/crat.2170160606

Subject(s) - sodium tungstate , thermodynamics , tungstate , enthalpy , crystallization , arrhenius equation , strontium , activation energy , diffusion , kinetic energy , chemistry , materials science , inorganic chemistry , tungsten , metallurgy , physics , organic chemistry , quantum mechanics

From the estimated diffusion rate‐constants ( k D1 ) of strontium tungstate crystal growth from sodium tungstate melts in platinum crucibles, energy (E), enthalpy (Δ H a ), entropy (Δ S a ) and free‐energy (Δ G a ) of activation and the pre‐exponential factor ( k 0 ) for the process were estimated using an ordinary Arrhenius equation k Dl = k 0 e − E/RT . These thermodynamic parameters were virtually unaffected by the changes in crystallization temperatures ( T 0 ) and cooling rates ( R ) T . The distance ( r 12 ), between a diffusing species and its host necesary for a successful diffusion, increased with T 0 and T T but there was no direct correlation.

This content is not available in your region!

Continue researching here.

Having issues? You can contact us here

Accelerating Research