Studies On Shock Compression Behavior Of Ferromagnetism Material Nd₂Fe₁₄B

From views of the experiment and theory, the equation of state of Nd₂Fe₁₄B at high temperature and high pressure has been studied with techniques of a two stage light gas gun, the Mie-Gruneisen's model and the volume additive principle, and then, the potential applications for the material are also discussed in this paper.Based on the impedance matching theory, the technique of shock wave coaxial detector and the magnetic measurement of velocity, the properties of Nd₂Fe₁₄B are investigated within the pressure range of 19GPa-78GPa. The Hugoniots and D-u relation of Nd₂Fe₁₄B with initial density of 7.346g/cm³ are respectively measured. (the error is about±0.1ï¼…)Fitting the D-u relation of Nd₂Fe₁₄B close to the experimental results(the error is about 0.1ï¼…) as follow:D=3.686+1.059U_pNew formulae of cold energy and cold pressure for elemental Neodymium and Ferrum has been re-deducted by Born-Meyer's potential function and their basic data, and the Boron's contributions to system ignored. Thus, a new equation of state of Nd₂Fe₁₄B has been proposed as:P_H=ρ₀c₀²[1-η/1-(1-η)λ]²where c₀≌c₀′(1+1.52×10^-2),λ≌λ′(1-0.82×10^-2),η=1-V/V₀. Compare calculated Hugoniots with experimental data, the agreement is well, but disappointed at higher and lower pressure range, respectively.