Calcium phosphate sintered particles and production method therefor

A ceramic particle group containing a ceramic particle, wherein:

• the ceramic particles are 100 or more and have an average particle diameter within a range of 10 nm to 700 nm;
• the ceramic particles are a calcium phosphate sintered body particle;
• the ceramic particles contain no calcium carbonate;
• and
• the ceramic particles satisfy the following property (A):
• (A) the ceramic particle group shows a reduction in weight of 2% or less in a temperature range of 25° C. to 200° C. when sufficiently dried, left to stand for 3 days or more under conditions of normal pressure, a temperature of 25° C., and a humidity of 50%, and then measured for the weight under conditions of a nitrogen stream and 10° C./min by using a thermogravimetric differential thermal analyzer (TG-DTA, EXSTAR6000 manufactured by Seiko Instruments Inc.).

A ceramic particle group containing a ceramic particle, wherein:

• the ceramic particle has a particle diameter within a range of 10 nm to 700 nm;
• the ceramic particle is a calcium phosphate sintered body particle;
• the ceramic particle contains no calcium carbonate;
• the ceramic particle has a half value width within a range of 0.2 to 0.8 at d=2.814 measured by an X-ray diffraction method, and
• the ceramic particle contains carbonate apatite at least on a surface thereof.

A ceramic particle group containing a ceramic particle, wherein:

• the ceramic particle has a particle diameter within a range of 10 nm to 700 nm;
• the ceramic particle is a calcium phosphate sintered body particle;
• the ceramic particle contains no calcium carbonate;
• and
• the ceramic particle contains B type carbonate apatite.