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Na x Sr 1 -2x Nd x MoO 4 (x = 0-0.5, Δx = 0.1) solid solutions with the scheelite structure have been synthesized for the first time and their crystallographic parameters have been determined as functions of composition and temperature. Their thermal expansion coefficients have been determined in the temperature range 25-1000°C: α a = (12.9-14.9) × 10 -6 °C -1 and α c = (24.9-25.9) × 10 -6 °C -1 . Using spark plasma sintering at t max ≈ 872-985°C and τ ≈ 650-750 s, we have prepared ceramics with relative densities in the range 97-99%.

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The Spark Plasma Sintering method was used to produce high-density ceramics from tungstates SrWO 4 and NaNd(WO 4 ) 2 with scheelite structure. These compounds are proposed as possible matrices for the consolidation of radwaste components. Powder samples were obtained by coprecipitation method and studied by X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM). After sintering, the samples retained their phase identity (scheelite structure). The total duration of sintering was ∼ 13-15 min, the relative density was reached ∼ 92, 99%.