Continuous tailoring thermal expansion from giant negative to positive in Ni2P2O7-based materials

Control of thermal expansion is of great fundamental and technological significance for functional materials. Here, we have achieved the thermal expansion controllable from giant negative, zero to positive in Ni2P2O7-based materials through doping Mn. A joint study of XRD and Raman was conducted to reveal negative thermal expansion originates in the change of phase proportional. This work also provided new insight into to improve negative thermal expansion in phase transition type materials.

Automated summary

Control of thermal expansion is crucial for functional materials. In this study, the thermal expansion of Ni2P2O7-based materials was controllable from negative to zero to positive by doping Mn. XRD and Raman analysis revealed that the negative thermal expansion originated from a change in phase proportion. This work provides new insight into improving the negative thermal expansion in phase transition materials.