Methods: Both hydrated and unhydrated cements were mounted for XRD analysis. An X-ray diffractometer using Cu Ká radiation was set to run at 40 KV and 30 mA in a continuous mode. The scan range was 5-60 ̊ 2è with a scan speed of 2 ̊/min. X manager evaluation software was used for the analysis.
Results: In powder pattern, the sharpest peak was related to bismute oxide, followed by tricalcium silicate. The peaks reduced in intensity in the hydrated phases. The sharpest peak was related to bismute oxide. Portlandite was identified in the set forms. However, it was not observed in the powder forms. Peaks related to Portlandite were more intense in neutral pH in comparison with acidic and alkaline pH.
Conclusions: WMTA was best hydrated in neutral and then alkaline environments.