Novel binary and ternary phases in the Si-C-N system

Abstract

The present article reviews recent advances in synthesis of novel phases in the ternary Si-C-N system. A dense carbon nitride phase, C2N2(NH), was synthesized for the first time at high pressures and high temperatures in a laser heated diamond anvil cell (LH-DAC). Based on results of electron diffraction, EELS-and SIMS-measurements combined with theoretical calculations the structure of this new C-N-H compound was analysed to be a defect wurtzite structure of the sinoite (Si2N2O)-type. Farther, a variety of amorphous SiCN phases and the first ternary crystalline phases, namely Si(NCN)2 and Si2N2(NCN), were synthesized at ambient pressure. In general, the high-pressure polymorphs of Si-C-N materials are predicted to exhibit a unique combination of high hardness, thermal stability and oxidation resistance with interesting optoelectronic properties.

Atomic transport in metastable compounds: Case study of self-diffusion inSi−C−Nfilms using neutron reflectometry

“…17 They can be produced by a variety of methods such as polymer pyrolysis, 8,9 laser deposition, 18 ion implantation, 19 and magnetron sputtering 20,21 in the form of bulk materials and thin films. After synthesis Si-C-N materials are generally in a complex amorphous state, showing interesting features such as nanometer-scale phase separation 22 or transitions to new ternary crystalline compounds 9,10,23 and also metastable phases.…”

Effects of Si/C Ratio on the Phase Composition of Si-C-N Powders Synthesized by Carbonitriding

“…Conventionally, ternary SiCN materials are prepared by the pyrolysis of preceramic polymers [11], the magnetron sputtering [12] and the vapor deposition [13]. In the polymer-derived ceramic (PDC) route, amorphous Si-C-N compounds were made of the polymer precursors by the thermally induced ceramisation [14]. Other elements such as Al [15][16][17], Ti [18,19] and B [20,21] can be introduced through a precursor for synthesis [22][23][24][25], which can alter properties of SiCN based materials [26].…”

Nitrogen self-diffusion in magnetron sputtered Si-C-N films

“…Silicon carbonitrides (Si-C-N) are advanced multifunctional materials [1][2][3][4][5] with a wide range of applications. They can be used as structure ceramics, 6 as wear-protection and corrosion-resistant hard coatings, 7 for oxidation protection, 8 as micro-electromechnical parts (MEMS), 9 as wide bandgap blue-ultraviolet opto-electronic devices, 10 as tunable electrical conductors, 11 as sensors, 10 as novel magnetic materials, 12 as biomedical implants, 13 for fuel reforming, 14 and as negative electrodes in Li ion batteries.…”

“…They can be used as structure ceramics, 6 as wear-protection and corrosion-resistant hard coatings, 7 for oxidation protection, 8 as micro-electromechnical parts (MEMS), 9 as wide bandgap blue-ultraviolet opto-electronic devices, 10 as tunable electrical conductors, 11 as sensors, 10 as novel magnetic materials, 12 as biomedical implants, 13 for fuel reforming, 14 and as negative electrodes in Li ion batteries. 15 Si-C-N materials can be produced by a variety of methods like polymer pyrolysis, 1,2 laser deposition, 16 ion-implantation, 17 and magnetron sputtering 18,19 in form of bulk materials and thin films. After synthesis Si-C-N materials are generally in a complex amorphous state, showing interesting features like nanometer scale phase separation, 20 transitions to new ternary crystalline compounds 2,21,46 or also metastable structures.…”