Doctoral thesis is devoted to synthesis and characterization of amorphous calcium phosphate materials with emphasis on their specific surface area. Ways of optimization of an existing synthesis method are investigated experimentally and development of a new synthesis method for obtaining of amorphous calcium phosphate with specific surface area value close to the biological calcium phosphate one (>100 m2/g). Amorphous calcium phosphate obtained with the developed method is studied for its structure, stability, thermal properties, furthermore dense amorphous calcium phosphate bioceramics has been developed using principles of cold sintering process. The developed biomaterials are intended for bone tissue replacement and regeneration. Thesis is prepared as a collection of articles. It contains summary and four publications.