Calcium carbonate CaCO₃ (calcite) powder with 100 – 200 nm size particles with nearly isometric shape was obtained by heat-treating at 600°C a product synthesized from a 2 M solution of citric acid H₃C₆H₅O₇∙ H₂O and commercial calcium carbonate CaCO₃ (calcite) powder with 1 – 4 μm size prismatic particles. The sequence of chemical transformations CaCO₃→ CaC₆H₆O₇∙3H₂O/Ca₃(C₆H₅O₇)₂→ 4H₂O → CaCO₃ makes it possible to change the properties (size and shape) of the particles of calcium carbonate CaCO₃. Thanks to these properties the obtained highly dispersed calcite CaCO₃ powder can be recommended as a filler for obtaining unique composites with inorganic (glass, ceramic, cement) or polymer matrices.

中文翻译：

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化学转化作为控制碳酸钙粉性能的工具

通过在600°C下热处理从2 M柠檬酸H ₃ C ₆ H ₅ O ₇ ∙H溶液合成的产物，可以得到具有100-200 nm尺寸近似等距形状的碳酸钙CaCO ₃（方解石）粉末。₂ O和商业碳酸钙CaCO ₃（方解石）粉末，具有1-4μm大小的棱柱形颗粒。化学转化的顺序CaCO ₃ →CaC ₆ H ₆ O ₇ ∙3H ₂ O / Ca ₃（C ₆ H ₅ O ₇）₂ →4H ₂O→CaCO ₃可以改变碳酸钙CaCO ₃的颗粒的性质（尺寸和形状）。由于这些特性，可以将获得的高度分散的方解石CaCO ₃粉末推荐用作填充剂，以获取与无机（玻璃，陶瓷，水泥）或聚合物基质形成的独特复合材料。