▎ 摘　　要

NOVELTY - Conductive magnesium phosphorus (Mg-P) co-doped copper vanadate (Cu2V2O7)-graphene negative thermal expansion material comprises 20-30 pts. wt. graphene oxide, 22-26.5 pts. wt. CuO, 2.5-6 pts. wt. MgO, 36-37 pts. wt. V2O5, and 7-13 pts. wt. ammonium dihydrogen phosphate (NH4H2PO4). USE - Conductive Mg-P co-doped Cu2V2O7-graphene negative thermal expansion material. ADVANTAGE - The lattice distortion and scattering probability of electrons and high frequency dielectric constant are reduced, enhancing the conductivity of Cu2V2O7. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the negative thermal expansion material comprising sequentially adding CuO, MgO and V2O5 into planetary ball mill, ball milling at revolution speed of 40-60 revolutions/minute (rpm) and rotation speed of 600-640 rpm for 10-18 hours until all ball-milled material passes through 500-600-mesh sieve, heating the material at 70-80 degrees C, evaporating absolute ethyl alcohol, drying the solid mixture, sequentially adding graphene oxide and solid mixture in distilled water, heating the solution at 70-80 degrees C, performing ultrasonic treatment for 2-3 hours at ultrasonic frequency of 20-22 KHz, removing the solvent, drying the solid product, putting in a resistor furnace, increasing the temperature at 3-5 degrees C/minute to 480-510 degrees C, keeping the temperature for 5-8 hours, obtaining calcined product i.e. Mg-doped Cu2V2O7-loaded graphene oxide, sequentially adding NH4H2PO4, Cu1.3-1.7Mg0.3-0.7V2O7-graphene, and Mg-doped Cu2V2O7-loaded graphene oxide into planetary ball mill, ball milling at revolution rate of 30-60 rpm and rotation speed of 580-640 rpm for 10-18 hours until all the ball milled material passes through 400-500-mesh sieve, heating the material at 70-80 degrees C, evaporating the absolute ethyl alcohol, drying the mixed solid product, placing in a resistor furnace, increasing the temperature at 3-5 degrees C/minute to 520-540 degrees C, keeping the temperature for 12-15 hours, and obtaining the product.