This project is to design an electric power generator by phase-transforming ferroelectric materials from small temperature fluctuations. Recycling and harvesting energy from waste heat is one of the most urgent challenges in energy science and technology. The generation of waste heat is unavoidable from fuel burn, running computers and solar radiation. Ferroelectric materials undergoing first-order phase transformation accompanied by a sudden change in polarization have attracted increasing attention in recent years for energy conversion. Such a behavior, commonly known as the pyroelectric effect, has been exploited for some energy harvesters. However, these devices have to work under an external voltage source for providing a bias field. In order to design a stand-alone “heat engine” by phase transformation only, we proposed a new thermodynamic model. Based on our model, we propose in this project to build a platform that can recycle the low-grade heat in a narrow temperature range and generate promising pyroelectric current in a continuous manner. Eventually, we hope to commercialize it practical for electricity generation by recycling the low-grade waste heat. One such an application is the electricity generator and the CPU cooler for large scale computing centers.