Zero and controllable thermal expansion in ${\mathrm{HfMgMo}}_{3-x}{{\rm{W}}}_{x}{O}_{12}$

Abstract

HfMgMo 3−x W x O 12 with x = 0.5, 1.0, 1.5, 2.0, and 2.5 are developed with a simple solid state method. With increasing the content of W, solid solutions of HfMgMo 3−x W x O 12 crystallize in an orthorhombic structure for x ≤ 2.0 and a monoclinic structure for x > 2.0. A near-zero thermal expansion (ZTE) is realized for HfMgMo 2.5 W 0.5 O 12 and negative coefficients of thermal expansion (NCTE) are achieved for other compositions with different values. The ZTE and variation of NCTE are attributed to the difference in electronegativity between W and Mo and incorporation of a different amount of W, which cause variable distortion of the octahedra and softening of the MoO 4 tetrahedra, and hence an enhanced NCTE in the aand c-axis and reduced CTE in the b-axis as revealed by Raman spectroscopy and x-ray diffraction.

Preparation of a magnetic molecularly imprinted polymer using g-C3N4–Fe3O4 for atrazine adsorption

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