The thermal behavior of dilithium-tetrahydridoberyllate Li 2BeH 4 has been studied up to 825 K by simultaneous DSC-TGA measurements. A solid–solid transition between the hexagonal phenakite form (Be 2SiO 4) previously described and a possible high-temperature cubic form (Li 2SO 4-HT) occurs at 536±2 K. In addition the thermal decomposition has been characterized by measuring the mass of gas released during heating up to 1075 K. Two distinct steps in the temperature ranges 545–575 K and 905–935 K indicate a total loss of two moles of hydrogen per mole of hydride. The variation of specific heat against temperature has been measured in the 180–420 K range by differential microcalorimetry. A weak but reproducible and reversible anomaly can be detected in the 320–350 K range. This anomaly is marked by a change in the slope of the C p vs. T curve. The change in the slope clearly corresponds to a maximum in the vicinity of 340 K on the C p/ T vs T representation. This thermodynamic behavior could be interpreted as a superconductivity criterion when correlated with magnetic irreversibilities previously observed for the same compound. Thus, LiBe 2H 4 could appear like a type-II superconductor with a critical temperature T c=(340±10) K. However this remarkable potential property requires resistivity measurements to be definitely established.