<p>Calcium borate has been employed for various purposes, including fire resistance enhancement, lubrication, and coating applications. This research aimed to analyze calcium borate synthesis through a solid-state reaction, which includes various parameters such as composition, temperature, and time. To achieve this, a selected composition was subjected to thermal analysis by DTA/TG, and the decomposition behavior of CaCO₃ and H₃BO₃ was determined. Additionally, the solid-state reaction temperature was defined as 900&#xa0;°C. Six compositions were designed based on the CaO-B₂O₃ binary phase diagram, using calcium carbonate and boric acid as starting materials. The synthesis of calcium borate was carried out at 900&#xa0;°C for 3&#xa0;h. X-ray diffraction (XRD) analysis performed to determine phase analysis of solid stated calcium borate composition and detected Ca₂B₂O₅, Ca₂B₂O₄, CaB₄O₇. Scanning electron microscopy (SEM) were then used to investigate the morphological properties of the produced powder. An increase in the amount of boron content, solid-state morphology transforms cluster-enlarged particles, depending on the existence of CaB₄O₇. Stretching of the bonds was investigated using FTIR, and therefore, three different calcium borate phases, which are Ca₂B₂O₅, Ca₂B₂O₄, and CaB₄O₇, were found. Therefore, different calcium borate forms were produced via solid state reaction, and the increase in boron amount encouraged the formation of CaB₄O₇.</p>