In the present work temperature dependence of heat capacity of KTh2(PO4)(3) has been measured for the first time in the range from 5.5 to 350 K by precision adiabatic vacuum calorimetry. The experimental data were used to calculate standard thermodynamic functions, namely the heat capacity Cp 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 to 350 K. The value of the fractal dimension D in the function of multifractal generalization of Debye's theory of the heat capacity of solids was estimated and the character of heterodynamics of structure was detected. The high-temperature X-ray diffraction method was used for the determination of thermal expansion coefficients. (C) 2014 Elsevier B.V. All rights reserved.