Abstract: The new ternary metal chalcogenides, KZrSe₆ and KZrTe₆, were synthesized by the reactive fiux method at intermediate temperature. The reaction of Zr metal with K₂Se₃/Q (the mole ratio K₂Se₃:Zr:Q=1:1:5, Q=Se, Te) at 500℃ for 5 days leads the formation of the title compounds. Both KZrSe₆ and KZrTe₆ crystals are black needles. They have some characterastics of thermodynamically metastable phases.

Key words: KZrSe₆, KZrTe₆, reactive flux method, solid state synthesis, thermodynamically metastable phases