A near-zero thermal expansion material: AlMoVO7.

An orthorhombic AlMoVO 7 was synthesized by solid-state method. Its phase, expansion property, and Raman spectra were analyzed in detail. Analysis showed that AlMoVO 7 has near-zero expansion in 173–673 K. With increasing temperature, the librational and translational vibrations of [AlO 6 ] and [MoO 4 ] caused the Al-O-Mo chain bending. The thermal expansion of AlMoVO 7 unit cell has an anisotropic and near-zero expansion. The thermal expansion performance of AlMoVO 7 block depends on its unit cell structure and microstructure. Therefore, near-zero expansion in 173–673 K is shown. [Display omitted] • AlMoVO 7 always maintains an orthogonal structure at 153–673 K. • AlMoVO 7 exhibits near-zero expansion in the temperature range of 173–673 K. • With the change of the a , b and c , AlMoVO 7 unit cell expansion is anisotropic. An orthorhombic AlMoVO 7 was synthesized by solid-state method. Its phase, expansion property, and Raman spectra were analyzed in detail. Analysis showed that AlMoVO 7 has near-zero expansion in 173–673 K. With increasing temperature, the librational and translational vibrations of [AlO 6 ] and [MoO 4 ] caused the Al-O-Mo chain bending. The thermal expansion of AlMoVO 7 unit cell has an anisotropic and near-zero expansion. The thermal expansion performance of AlMoVO 7 block depends on its unit cell structure and microstructure. Therefore, near-zero expansion in 173–673 K is shown. [ABSTRACT FROM AUTHOR]