THERMAL-PROPERTIES OF NA2MOO4(S) AND NA2MO2O7(S) BY HIGH-TEMPERATURE CALVET CALORIMETRY IN THE TEMPERATURE-RANGE 335-K TO 760-K

被引：25

作者：

IYER, VS ^{[1
]}

AGARWAL, R ^{[1
]}

ROY, KN ^{[1
]}

VENKATESWARAN, S ^{[1
]}

VENUGOPAL, V ^{[1
]}

SOOD, DD ^{[1
]}

机构：

[1] BHABHA ATOM RES CTR,DIV RADIOCHEM,BOMBAY 400085,INDIA

来源：

JOURNAL OF CHEMICAL THERMODYNAMICS | 1990年 / 22卷 / 05期

关键词：

D O I：

10.1016/0021-9614(90)90134-C

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Enthalpy increment Δ298.15 KTHmo measurements were made on Na2MoO4(s) and Na2Mo2O7(s) in the temperature range 335 K to 760 K by the drop method using a high-temperature Calvet calorimeter. The calorimeter was calibrated using an electrical method and synthetic sapphire SRM-720 (Al2O3). An on-line computer was used for acquiring and processing results from the calorimeter. The enthalpy increments for Na2MoO4(s) and Na2Mo2O7(s) were least-squares fitted to a polynomial with temperature and are given by: Na2MoO4(s): ΔT298.15 K/(J·mol-1)±109=-38795+113.7(T/K) +0.0546(T/K)2, (335 to 520 K)ΔT298.15 K/(J·mol-1)±111=-38598+142.8(T/K) +0.00458(T/K)2, (520 to 720 K)ΔT298.15 K/(J·mol-1)±538=-105740+270.7(T/K ) (720 to 760K)Na2Mo2O7(S): ΔT298.15 K/(J·mol-1)±318=-62413105740+190. 6(T/K)+0.0589(T/K)2, (335 to 760 K) The thermal properties of Na2MoO4 and Na2Mo2O7 were obtained using the above experimental values. These are the first experimental results on the thermal properties of these compounds. © 1990.

引用

页码：439 / 448

页数：10