Low-thermal-expansion materials in a wide temperature range are expected to be used in electronic devices, optical devices, and nanoscale devices. The authors have tried to fabricate a single-phase zero-thermal-expansion material. A new single-phase ceramic material, (Al-2x(HfMg)(1-x))(WO4)(3), could be produced from a mixture of a negative-thermal-expansion material, (HfMg)(WO4)(3), and a positive-thermal-expansion material, Al-2(WO4)(3). At x = 0.15 this material shows nearly zero thermal expansion from room temperature to 800 degrees C.