Zero Thermal Expansion in (Al sub(2x)(HfMg) sub(1-x))(WO sub(4)) sub(3)

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 sub(2x)(HfMg) sub(1-x))(WO sub(4)) sub(3), could be produced from a mixture of a negative-thermal-expansion material, (HfMg)(WO sub(4)) sub(3), and a positive-thermal-expansion material, Al sub(2)(WO sub(4)) sub(3). At x=0.15 this material shows nearly zero thermal expansion from room temperature to 800C.