Thermal Effects in Mixtures of Boronic Acid with Aluminum after Plastic Deformation under High Pressure

Thermally stimulated processes in mixtures of boric acid (BA) with aluminum after plastic deformation under a pressure of 0.5–4.0 GPa were studied by differential scanning calorimetry (DSC) and thermogravimetry. In the original BC, in the range of 20–200°C, splitting of water occurs, accompanied by an endothermic effect. In deformed mixtures BC–Al = 50–50, the endoprocess was recorded on DSC thermograms in the range of 20–200°С, an exoprocess in the range of 200–550°С, an aluminum-oxidation exoprocess at 620°С, and an aluminum melting endoprocess at 656°С. The baric dependences of the parameters of thermal processes in deformed mixtures exhibited extrema at pressures of 1.0 and 2.5 GPa, which were associated with changes in the electronic structure of aluminum caused by high pressure. Such changes can be retained in deformed mixtures after completion of pressure treatment and manifest themselves upon heating due to the formation of electrical double layers in mixture samples.