Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6660529 | The Journal of Chemical Thermodynamics | 2015 | 9 Pages |
Abstract
The heat capacity of olivine-type lithium iron phosphate (LiFePO4 - LFP) has been measured covering a temperature range from (2 to 773)Â K. Three different calorimeters were used. The Physical Property Measurement System (PPMS) from Quantum Design was applied in the range between TÂ =Â (2 and 300)Â K, a Micro-DSC II from Setaram within the range between TÂ =Â (283 and 353)Â K and data between TÂ =Â (278 and 773)Â K were measured by means of a Sensys DSC (Setaram) using the Cp-by-step method. Experimental data are given with an error of (1 to 2)% above TÂ =Â 20Â K and up to 8% below 20Â K. The data were subdivided into appropriate temperature intervals and fitted using common heat capacity functions. The low temperature results permit the calculation of standard entropies and temperature coefficients of electronic, lattice, as well as magnetic (antiferromagnetic transition at TÂ =Â 49.2Â K) contributions to the heat capacity. The obtained experimental values were compared to results of a recently published first principles phonon study (DFT) and to few available experimental data from the literature.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Stefan Loos, Daniel Gruner, Mahmoud Abdel-Hafiez, Jürgen Seidel, Regina Hüttl, Anja U.B. Wolter, Klaus Bohmhammel, Florian Mertens,