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In electric furnaces destined for experimental geochemical investigations, a small temperature gradient (TG) always exists, and it is difficult to avoid it. In our electric furnaces (from bottom to top) the temperature rises in the lower part (TG = 0.25°/cm) and falls in the upper part (TG = -0.16°/cm). Long-term runs with quartz and water at 300°C have shown the attainment of equilibrium at TG equal...
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