RESEARCH OF HEAT CAPACITY OF SINTERED SAMPLES OF EUROPIUM, DYSPROSIUM, LANTHANUM AND SAMARIUM HAFNATES

The paper considers the production of hafnate powders of europium, dysprosium, lanthanum and samarium by mechanochemical synthesis and their subsequent spark plasma sintering. Technological properties of europium, dysprosium, lanthanum and samarium hafnate powders were studied, namely, average particle size, fluidity, bulk density. By the method of spark plasma sintering samples of europium, dysprosium, lanthanum and samarium hafnates with relative density of 92-98 % were obtained. Spark plasma sintering was carried out at a temperature of 1200 oC in a vacuum, pressure of 350 kN and holding under pressure for 15 minutes. The specific heat capacity of europium, dysprosium, lanthanum and samarium hafnates obtained by spark plasma sintering was studied.