In the present work, the temperature dependence of heat capacity of KNbTeO6 has been measured for the first time over the range from 6 K to 332 K by precision adiabatic vacuum calorimetry. The experimental results were used to calculate standard thermodynamic functions, namely the heat capacity C-p degrees(T), enthalpy H degrees(T) - H degrees(0), entropy S degrees(T) - S degrees(0) and Gibbs function G degrees(T)-H degrees(0), for the range from T -> 0 K to 332 K. The phase transitions and thermal decomposition of KNbTeO6 were determined by differential scanning calorimetry. Structural changes in phase transitions were studied by high-temperature Raman spectroscopy. (c) 2016 Elsevier Ltd.