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This paper expresses the ultrasonic velocities which dependents on temperature of plutonium monopnictides for longitudinal and shear waves along <100>, <110> and <111> directions in the temperature order 100-500K. By using Coulomb and Born-Mayer potential, the second and third order elastic constants have figured out for plutonium monopnictides. The magnitudes of elastic constants are highest for PuN at room temperature. So the mechanical characteristics of PuN are more suitable than other compounds. The value of B/G is less than 1.75 so these materials are brittle in nature. The ultrasonic velocity is highest for PuP. This indicates that PuP is good candidate for wave propagation. The Debye temperature and Debye velocity are highest for PuN. We have investigated the value of pressure derivative. We have also investigated in this paper thermal conductivity, specific heat per unit volume, crystal energy density, thermal relaxation time, acoustical coupling constant D, ultrasonic attenuation along <100>, <110> and <111> direction, Young's modulus, shear modulus, bulk modulus, poisson's ratio at 300K. Evaluated results are discussed and correlated with applicable data of similar type of materials.
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