Gruneisen parameters, bulk modulus, and thermal expansion coefficient of Na3MCO3PO4 (M = Mn, Fe, Co, and Ni) carbonophosphates

Technological advances in recent decades have made the growing demand for energy one of the main bottlenecks for the development of more complex equipment and processes, requiring a constant search to more efficient materials and techniques that increase the efficiency of energy storage devices. Making use of Raman, X-ray diffraction (XRD), and first-principles calculation techniques, applied in Na3MCO3PO4 (M = Mn, Fe, Co, Ni) carbonophosphates in a wide range of pressure and temperature, several thermoelastic and structural parameters were determined. Gruneisen parameters, bulk modulus, and thermal expansion coefficient, as well as the anisotropy under pressure and temperature change, were satisfactorily quantified, characterizing the distinct molecular ambient from the carbonate and phosphate groups of these materials. The results indicate an increasing stiffness and a greater anharmonic contribution as we move towards a more compact structure, indicating an increase in its phonon-phonon interaction.

Automated summary

Technological advances have led to a growing demand for energy, which has become a bottleneck for the development of complex equipment and processes. Therefore, there is a constant need for more efficient materials and techniques to improve the efficiency of energy storage devices.