Abstract
The phase diagram for the binary system K 2CrO 4CaCrO 4 has been determined for CaCrO 4 concentrations up to 60 mole%, using the techniques of differential thermal analysis, X-ray diffraction, and drop calorimetry. Essential features of the phase diagram are: the solid-solid phase transition for pure K 2CrO 4 at 670°C, β-K 2CrO 4 ⇄ α-K 2CrO 4; a eutectoid reaction at 14 mole% CaCrO 4 and 548°C, β-K 2CrO 4 ⇄ α-K 2CrO 4 + K 2CrO 4 · CaCrO 4; a peritectoid event at 50 mole% CaCrO 4 and 640°C, β-K 2CrO 4 + CaCrO 4 ⇄ K 2CrO 4 · CaCrO 4; and a eutectic reaction at 51 mole% CaCrO 4 and 678°C, L ⇄ β-K 2CrO 4 + CaCrO 4. X-ray diffraction studies lead to the determination of the unit cell dimensions for the K 2CrO 4 · CaCrO 4 double salt, a C-centered monoclinic form with a 0 = 7.615(6) Å, b 0 = 22.797(15) Å, c 0 = 9.777(9) Å, β = 115.45(5)°.
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