Solution-Based Synthesis of Hafnium Carbide (HfC) Powders

A different chemical route to prepare hafnium diboride‐based nanofibers: Effect of chemical composition

“…10,25 The absorption peak at 427 cm −1 in acidic conditions can be devoted to stretching vibration of Hf-O bonds along with a decrease in peak intensity and a small shift to the lower wavenumber in neutral sample (413 cm −1 ), indicating the interaction between C = O group and Hf atom having higher bond lengths and less intramolecular hydrogen bonding in neutral conditions (Figure 9). 26,56 From the FTIR spectrum of the polymeric precursor derived from acidic conditions, the characteristic absorption peaks of 845, 1023, and 1170 cm −1 are, respectively, assigned to vibration of Hf-O-Hf, 57 Hf-O-C, and Hf-O-C-B bonds. 25,26 It can be observed that the peak broadening and shift to lower wavenumbers have occurred in the neutral sample (eg, in the ranges ~400-800 cm −1 and ~1200-1800 cm −1 ), which likely reflects the formation of more hydrogen bonding.…”

Synthesis and characterization of nano-crystalized HfC based on an aqueous solution-derived precursor

“…[6][7][8][9][10] Solution-based processing possesses the advantages of forming a homogenous distribution of all elements on a molecular level, which can reduce the kinetic barriers and lower the reaction temperatures, thus leading to ne size of the synthesized particles. [11][12][13] Moreover, it has great potential to be used as facile precursor for the fabrication of continuous bers reinforced HfC ceramic matrix composites. [14][15][16][17][18][19][20] Consequently, synthesis of HfC powders by solution-based processing has drawn much attention.…”

Synthesis and Characterization of Hafnium Carbide Based Ceramics

“…There are many available synthesis routes for synthesis of HfC powders such as direct combination of the elements at elevated temperature,mechanical activation of solid-state precursors, carbothermal reduction of metal oxide compounds, vapor phase synthesis, sol-gel, electrochemical synthesis in molten chloride bath, laser induced reactions, plasma-chemical synthesis, pyrolysis of metal organic compounds [10][11][12][13][14][15][16][17]. In spite of unique properties of HfC, it has been hardly fabricated on an industrial scale because of expensive raw materials and high cost of processing.…”