In this work, we aim to determine the electric resistivities of liquid Sb₂Te₃and Ge₂Sb₂Te₅. Electric resistivities were measured using the four-terminal method. First, the electric resistivities of liquid Ga and Sn were measured to establish this method. Second, the electric resistivities of Sb₂Te₃and Ge_1.6Sb_2.0Te_5.0were measured over temperature ranges between the respective melting temperatures of samples and 1020 K. The electric resistivity of Sb₂Te₃has been determined to be 4.36±0.14 µΩ m at 992 K. The uncertainty was determined on the basis of the guide to the expression of uncertainty in measurement. The electric resistivity of Ge_1.6Sb_2.0Te_5.0is smaller than that of Sb₂Te₃. It is also found that both resistivities decrease with an increase in temperature; which indicates that both liquid materials behave as a semiconductor. Therefore, the pseudogap model was applied to derive the electrical activation energies.

GeTe alloy has drawn much attention as one of the promising candidates for phase change memory application. In this work, the electrical resistivities and thermal conductivities of GeTe alloy have been determined as functions of temperature by the four-terminal method and hot strip method, respectively. The electrical resistivity increases and the thermal conductivity decreases monotonically with increasing temperature, and thus it is likely that free electron dominates the thermal conduction. The electrical resistivity increases slowly with time during holding at 773 K, and the thermal conductivity decreases corresponding to the change of the electrical resistivity, which suggests that small amount of high temperature phase might exist in the samples.

The thermal conductivity of solid Sb₂Te₃ has been measured by the hot strip method from room temperature to 789 K. The thermal conductivity of solid Sb₂Te₃ decreases with an increase in temperature up to approximately 500 K and then increases. It is proposed that phonon thermal conduction dominates the heat transport around room temperature although other mechanisms such as electron and ambipolar diffusion are also in operation. Ambipolar diffusion is thought to be more dominant at higher temperature and contributes to the increase in the thermal conductivity.

The composition and structure properties of the CrO_xN_y films deposited by RF reactive magnetron sputtering were investigated and correlated with their optical properties. Two kinds of targets Cr₂O₃ and CrN compounds with variation of N₂ and O₂ gas flow were used to prepare two series of samples. The phase structure, chemical composition and optical properties of CrO_xN_y films were characterised by X-ray diffraction, X-ray photoelectron spectroscopy and ultraviolet–visible near-infrared spectrophotometer, respectively. The films mainly consist of Cr₂N and CrO₃ phases. The Cr/ON ratio derived by XPS varies with the variation of nitrogen with Cr₂O₃ target. But only lower nitrogen content is detected with variation of oxygen using CrN target. The CrO_xN_y films with higher nitrogen content possess high absorbance around at 35% in the visible light range no matter the target.

Sb-Te alloys have drawn much attention due to its application in phase change memory as well as the unique properties as chalcogenide. In this work, the thermal conductivities of Sb-x mol%Te alloys (x = 14, 25, 44, 60, 70, and 90) have been measured by the hot strip method from room temperature up to temperature just below the respective melting points. For the intermetallic compound Sb₂Te₃ (x = 60), the thermal conductivity decreases up to approximately 600 K and then increases. For other Sb-x mol%Te alloys where x > 60, the thermal conductivities of the alloys decrease with increasing temperature. In contrast, for x < 60, the thermal conductivities of the alloys keep roughly constant up to approximately 600 K and then increase with increasing temperature. It is proposed that free electron dominates the heat transport below 600 K, and ambipolar diffusion also contributes to the increase in the thermal conductivity at higher temperatures. The prediction equation from temperature and chemical composition has been proposed for thermal conductivities of Sb-Te alloys.