Experimental investigation and thermodynamic modeling of the Gd–Si system

Oxygen-Deficient Oxide Growth by Subliming the Oxide Source Material: The Cause of Silicide Formation in Rare Earth Oxides on Silicon

“…Various crystal structures for rare-earth silicides are reported in the literature. For the Gd 2 O 3 film grown without oxygen, the high-resolution cross-sectional transmission electron microscopy (HRTEM) images (Figure b) and XRD measurements (further lattice planes not shown) are consistent with the reported data for the silicide GdSi 2– x with space group 191 ( P 6/ mmm ) and lattice parameters a = 0.387 nm and c = 0.418 nm . This assignment was further corroborated in a sample with Gd (metal) deposited on Si(111) at the same substrate temperature of 700 °C where identical XRD peaks appeared.…”

“…For the Gd 2 O 3 film grown without oxygen, the high-resolution cross-sectional transmission electron microscopy (HRTEM) images (Figure 3b) and XRD measurements (further lattice planes not shown) are consistent with the reported data for the silicide GdSi 2−x with space group 191 (P6/mmm) and lattice parameters a = 0.387 nm and c = 0.418 nm. 20 This assignment was further corroborated in a sample with Gd (metal) deposited on Si(111) at the same substrate temperature of 700 °C where identical XRD peaks appeared. LuSi 2−x with the same crystal structure (space group 191 (P6/mmm), lattice parameters a = 0.375 nm, c = 0.405 nm 21 ) and orientation as the GdSi 2−x was formed in the Lu 2 O 3 film grown without oxygen as evidenced by the almost identical XRD peaks and transmission diffraction spots in the RHEED pattern.…”

Effects of Si addition on microstructure and mechanical properties of Mg–8Gd–4Y–Nd–Zr alloy

“…The standard Gibbs free energy change DG T for Eqs. (1-3) was theoretically calculated according to the thermodynamics date (as shown in Table 2) [19][20][21][22] and plotted in Fig. 5 It can be clearly seen that the changes in standard state Gibbs free energies of the three reactions are all negative, which indicates that the above reactions are all favorable in Mg-Gd-Y-Nd-Zr-Si system.…”

Mechanical Properties and Thermal Conductivity of Y-Si and Gd-Si Silicides: First-Principles Calculations

“…Therefore, in this study, the mechanical properties of high-melting-point rare earth silicides YSi, Y 5 Si 4 , Y 5 Si 3 , GdSi and Gd 5 Si 4 were assessed using first-principles calculations. These materials were selected based on the phase diagrams of Y-Si and Gd-Si binary system [19,20]. The ductility of selected silicides was evaluated according to the ratio of shear modulus to bulk modulus.…”