The role of the thermal history of the precursor was studied for amorphous and crystalline calcium carbonate phases synthesized from calcium nitrate. The X-ray diffraction patterns of these phases are influenced by their annealing temperature of 0, 300, 400, and 500 °C. However, the effect of the precursor thermal history on the X-ray diffraction pattern of the resulting calcium carbonate phase is negligible. Transmission electron microscopy indicates that materials annealed at 400 °C consist of amorphous aggregates, irrespective of the precursor thermal history. The crystallite size of crystalline calcium carbonate is influenced by the precursor thermal history, and ranges from 23 to 26 nm. Near-edge X-ray absorption fine structure measurements indicate that the annealing temperature plays an important role in determining the local electronic structure. The role of the thermal history of the precursor is also important for the resulting electronic structure.

对于由硝酸钙合成的无定形和结晶碳酸钙相，研究了前体热史的作用。这些相的X射线衍射图受到0、300、400和500°C退火温度的影响。然而，前体热历史对所得碳酸钙相的X射线衍射图的影响可以忽略不计。透射电子显微镜表明，与前体的热历史无关，在400°C退火的材料由无定形聚集体组成。结晶碳酸钙的微晶尺寸受前体热历史的影响，范围为23至26 nm。近边缘X射线吸收精细结构测量表明，退火温度在确定局部电子结构中起着重要作用。前体的热历史的作用对于所得的电子结构也很重要。