Related Experiment Video
Updated: May 24, 2025
Gold Nanostar Synthesis with a Silver Seed Mediated Growth Method
Published on: January 15, 2012
Crystal Structure and Physical Properties of Au4Al-Type Suboxides in the Ti-Rh-Si-O and Ti-Ir-Si-O Systems
Zhijun Li1,2, Xun Kang1,2, Xuan Liang1,2
1Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.
Abstract:
This study reports the successful synthesis and comprehensive characterization of Ti3RhSiO and Ti3IrSiO, the earliest identified members of Ti-based Au4Al-type materials. These compounds crystallize in the cubic space group P213 (No. 198), with refined lattice parameters of 6.75362(2) Å and 6.75524(1) Å, respectively. Oxygen plays a crucial role in stabilizing the cubic phase, as confirmed by synchrotron X-ray diffraction and the absence of this phase in oxygen-free samples. First-principles calculations and resistivity measurements reveal a robust multiband metallic character, with Ti-3d and Rh-4d (or Ir-5d) orbitals contributing significantly at the Fermi level. Specific heat analysis highlights weak anharmonic lattice vibrations, while magnetoresistance measurements demonstrate negligible field sensitivity. These unique structural and electronic properties provide valuable insights into the development of Ti-based Au4Al-type compounds, opening new avenues for fundamental materials research.
Related Concept Videos
02:37Metallic Solids
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
02:22Structures of Solids
02:18X-ray Crystallography
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
02:42Ionic Crystal Structures
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
02:54Molecular and Ionic Solids
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
02:58Crystal Field Theory - Octahedral Complexes
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...