Add time:08/21/2019         Source:sciencedirect.com

Thermal diffusivity measurements for hafnium hydrides (HfHx) with different hydrogen concentrations (α + δ’-HfH0.20, α + δ’-HfH0.92, α + δ’-HfH1.15, δ’-HfH1.48, δ’-HfH1.57, δ-HfH1.70, δ + ɛ-HfH1.76, ɛ-HfH1.88 and ɛ-HfH2.02) were carried out within the temperature range of 290–570 K by means of a laser-flash method. The temperature dependence of the thermal diffusivity for α + δ’-HfH0.20 was the result of a mixture of a hexagonal α-phase and a slightly deformed face-centered cubic (fcc) δ’-phase structure that was similar to that observed in α-Hf. The thermal diffusivities for HfH0.92–2.02 at temperatures below 373 K drastically changed due to the phase transformation, while those at temperatures above 373 K remained almost the same, 0.06–0.08 cm2/s, which is approximately half that of α-Hf. In particular, the thermal diffusivities for δ’-HfH1.48 and δ’-HfH1.57 changed between 360 and 390 K with the conversion to an ideal fcc structure in the δ-phase. The temperature dependence of the thermal conductivities for α + δ’-HfH0.20, α + δ’-HfH0.92, δ’-HfH1.48, δ-HfH1.70 and ɛ-HfH2.02 were evaluated by way of calculations from the experimental thermal diffusivity data and reference data for the specific heat and density.

We also recommend Trading Suppliers and Manufacturers of Hafnium hydride (cas 12656-74-5). Pls Click Website Link as below: cas 12656-74-5 suppliers