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Glass‐reinforced HA composites were produced using phosphate‐based glasses, and a structure refinement was carried out to determine the effect of the glass on the structure of the residual HA. Quantitative phase analysis showed that the glass causes some of the HA to decompose to β‐TCP and, at higher temperatures, to α‐TCP. It also was indicated that when three phases were present, the formation of the α‐TCP arose from decomposition of the β‐TCP and not from further decomposition of HA to α‐TCP. The unit cell dimensions showed a decrease in the a axis and an increase in the c axis, giving an overall unit cell decrease in volume. There also was a significant effect based on the amount of glass added. The changes found in the composite containing the 4 wt % glass were attributed to the loss of carbonate and loss of hydroxyl. This was expected to cause shrinkage in the unit cell; however this was not …