sentences:  Tantalum hafnium carbide
  
  Tantalum hafnium carbide is a refractory chemical compound with a general formula TaxHfy-xCy, which can be considered as a solid solution of tantalum carbide and hafnium carbide.Individually, these two carbides have the highest melting points among the binary compounds, and , respectively, and their "alloy" with a composition Ta4HfC5 is believed to have a melting point of .