钙钛锆石基组合矿物固溶铈的研究

以ZrSiO₄、CaCO₃、TiO₂、Al₂O₃、Ce₂C₆O₁₂?10H₂O为原料，采用固相反应工艺合成掺Ce钙钛锆石基钛酸盐组合矿物。利用XRD、BSE、EDS等分析方法，研究组合矿物的制备及其对Ce的固溶。结果表明：合成掺Ce钙钛锆石基钛酸盐组合矿物的较佳温度为1230℃；组合矿物的主要晶相为钙钛锆石固溶体，次要晶相是榍石和CaTiO₃的固溶体；CeO₂在组合矿物中的最大固溶量为21.39%；组合矿物固溶Ce⁴⁺的机制较复杂，Ce⁴⁺固溶在Ca²⁺位或Zr⁴⁺位，Al³⁺固溶在Ti⁴⁺位对Ce⁴⁺固溶在Ca²⁺位有电价补偿作用。

Research of Solidifying Cerium in Assembled Minerals of Zirconolite-Based

The assembled minerals of zirconolite-based doped cerium were synthesized by solid-reaction, using zircon, calcium carbonate, titanium dioxide, alumina and oxalic-acid cerium as raw materials. The preparation of assembled minerals and solidifying cerium in it were researched by means of XRD, BSE, EDS and so on. The results indicate that the better synthesis temperature of the assembled titanate minerals of zirconolite-based doped cerium is 1 230 ℃. The main crystal phase is zirconolite, the secondary phases are sphene and perovskite. The maximum solidifying content of cerium dioxide is 21.39% in the assembled minerals. The mechanism of solidifying cerium in assembled minerals is comparatively complex. Ce⁴⁺ replaces the lattice site of Ca²⁺ or Zr⁴⁺, and Al³⁺ replaces the lattice site of Ti⁴⁺ as an electro-valence compensation of Ce⁴⁺ replacing Ca²⁺ lattice site.