Acoustic Velocity Measurements in the Metal Hydrides, ScH1.99, YH1.93, and ErH1.81

Abstract

Longitudinal and shear velocities have been measured as a function of temperature in polycrystalline samples of ScH1.99, YH1.93, and ErH1.81. From these measurements values of the limiting Debye temperature, θ0, the bulk modulus, Young's modulus, the shear modulus, and Poisson's ratio are calculated.

Effect of electronegativity on the mechanical properties of metal hydrides with a fluorite structure

“…5. The present elastic moduli are good accordance with the values by Beattie [11]. The Young's modulus reported in the literature [10] is smaller than our results.…”

“…However, these data were limited below 44 at.% H; titanium hydride exists as just precipitate in the metal matrix in this hydrogen content region. Tensile tests [10] and elastic properties measurement [11] for single-phase yttrium hydride were performed only for a few compositions. The several tensile tests of hydrided zirconium were also performed [10].…”

Mechanical properties of yttrium hydride

“…5, together with the values reported by Beattie [11]. Beattie calculated the Debye temperature of YH 1.93 as 537 K, determining that the N in the Eq.…”

Inorganic Compounds

“…Poisson's ratio is just slightly smaller than that for metallic scandium. Beattie (1972) also gives a Debye temperature of 759°K, which is about 1-8 times larger than that of scandium metal (see Table 5.1).…”

“…The elastic properties of poly crystalline ScH 1 . 99 at room temperature have recently been determined by Beattie (1972) from acoustic velocity measurements. The compressibility is 9-17 x 10" 12 m 2 /N; the bulk, Young's and shear moduli are: 10-90 x 10 10 , 15-6 x 10 10 and 6-20 x 10 10 (all in N/m 2 ), respectively, and Poisson's ratio is 0-261.…”