A MöSsbauer Evaluation of the ⁵⁷Fe Debye Temperatures In The Zr(Al_XFe_1-X)₂ System

The Mössbauer recoiless absorption of ⁵⁷Fe was utilized to monitor the iron cohesion properties in the zr(al_xfe_1-x)₂ system for a wide range of compositions, 0 ≤ x ≤ 0.825. Mössbauer spectral area ratios were accurately measured for those samples at three temperatures sets, 423 and 298 K, 433and 303 K, 612 and 303 K. These ratios depend on the recoil free fractions, f(T), of the absorber at the corresponding temperatures. An experimental area ratio may provide a singleparameter, i.e. the Debye temperature, θ_D, after assuming the Debye approximation. The results indicate a gradual decrease of the iron bonding strength from x = 0 to x = 0.2, demonstrated by a corresponding θ_D reduction from about 440 to 310 K.The Debye temperatureincreases again to approximately 400 for the Al-rich compounds. This behavior conforms with a previously proposed rule of reverse hydrogen absorption capacityin the above system.