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The thermochemical properties of Y2Si2O7and Dy2Si2O7

✍ Scribed by E.H.P. Cordfunke; A.S. Booij; R.R. van der Laan

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
143 KB
Volume
30
Category
Article
ISSN
0021-9614

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✦ Synopsis

The enthalpy increments of Y Si O and Dy Si O have been measured by drop-calorimetry 2 2 7 2 2 7 Ž . Ž . from T s 516.7 to 928.4 K, and T s 516.7 to 918.2 K, respectively. The standard molar enthalpy of formation of monoclinic Y Si O has been deduced from its enthalpy of solution 2 2 7 . y3 . y3 T Ž . Ž . Ž . in 6.20 mol dm HCl q 0.147 mol dm HF aq , and the value ⌬ H 298.15 K s f m . y1 Ž . y 3854.8 " 6.8 kJ mol has been obtained. For Dy Si O the standard molar enthalpy of 2 2 7 . y1 Ž . formation y 3776.1 " 4.6 kJ mol has been estimated.

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