Xue-Peng Wang

Erratum to “Metal–Insulator Transition of Ge–Sb–Te Superlattice: An Electron Counting Model Study”

Presents corrections to the paper, “Metal–insulator transition ofGe–Sb–Te superlattice: An electron counting model study,” (Chen, N.-K.), IEEE Trans. Nanotechnol., vol. 17, no. 1, pp. 140–146, Jan. 2018.

Sorption equilibrium moisture and isosteric heat of Chinese wheat flours

Data on equilibrium moisture content (EMC) for six Chinese wheat flour varieties were collected by a gravimetric method at 11-96% equilibrium relative humidity (ERH) and a temperature range of 10-35 °C. Six models were fitted to the sorption data, with the modified Guggenheim Anderson deBoer equation, modified Henderson equation (MHE), and a polynomial equation being the best fits. At a constant ERH, the EMC was negatively correlated with temperature, whereas there was a strong effect of temperature on the sorption isotherms of the wheat flours. Initially, the isosteric heats of adsorption for the wheat flours decreased rapidly with increasing sample moisture content (MC); however, when MC was higher than 15% of the wet basis, further increases in MC caused a slight decrease in heat adsorption values. The heat of vaporisation of the wheat flours approached the latent heat of pure water at a moisture content of ~17.5% wet basis, which was ~2,500 kJ/kg. The isosteric heat of sorption values of the wheat flo...

Origin of high data retention for Ge1Cu2Te3 phase-change memory

To meet the high-temperature applications of the phase change memory, Ge1Cu2Te3 (GCT) has been proposed to be a suitable candidate due to its good amorphous stability. Here, we investigate the basic atomic bonding mechanism by first-principles calculations to understand this. The amorphous GCT has significant chemical disorder with large amounts of homopolar bonds. Cage-like clusters (composed of 3-fold rings) are mainly related to Cu atoms. The bonding mechanism in crystalline GCT is proposed and demonstrated by the nonequivalent sp3 hybridization with Te lone-pair electrons. In contrast, amorphous GCT requires Cu d electrons to participate in bonding due to the isolation of Te lone-pair electrons. Thus, the vast difference in atomic and electronic structures between the amorphous and crystalline phase makes the good amorphous stability for high data retention.