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The standard molar enthalpies of formation of RE6UO12 (RE = La, Nd) by acid solution calorimetry

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Abstract

The standard molar enthalpies of formation (Δf H 0298 ) of RE6UO12 (RE = La, Nd) have been determined by using an indigenously developed isoperibol acid solution calorimeter. The water equivalent of this calorimeter was determined by electrical calibration. The accuracy of the enthalpy of dissolution determined by using this calorimeter has been tested by measuring the enthalpies of the dissolution of both KCl and tris (hydroxyl methyl) amino-methane (TRIS). The accuracy of the measurements was found to be about 2 %. The enthalpies of solution at 298 K of RE2O3 (RE = La, Nd), UO3 and RE6UO12 (RE = La, Nd) were measured by using this calorimeter. From these experimental results, the enthalpies of formation of RE6UO12 (RE = La, Nd) at 298 were computed by using Hess’s law of summation. These were found to be −6106 and −6020 kJ mol−1 for La6UO12 and Nd6UO12, respectively. These values are being reported for the first time.

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  1. Advanced Fuels Studies Section, Fuel Chemistry Division, Chemistry Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, Tamil Nadu, India

    R. Venkata Krishnan, G. Jogeswararao & K. Ananthasivan

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  1. R. Venkata Krishnan
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  2. G. Jogeswararao
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  3. K. Ananthasivan
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Correspondence to K. Ananthasivan.

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Venkata Krishnan, R., Jogeswararao, G. & Ananthasivan, K. The standard molar enthalpies of formation of RE6UO12 (RE = La, Nd) by acid solution calorimetry. J Therm Anal Calorim 121, 1375–1382 (2015). https://doi.org/10.1007/s10973-015-4640-y

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