SUBSTITUTION EFFECTS IN ZR2(WO4)(PO4)2 BY TI ON THE NEGATIVE THERMAL EXPANSION BEHAVIORS

Kei-ichiro Murai; Tetsuta Koizumi; Muhamad Faiz Farhan bin Mohamad Shah; Mohd Warikh bin Abd Rashid; Toshihiro Moriga

Kei-ichiro Murai Department of Chemical Science and Technology, Faculty of Engineering, Tokushima University, 2-1 Minami-Josanjima, Tokushima 770-8506, Japan
Tetsuta Koizumi Department of Chemical Science and Technology, Faculty of Engineering, Tokushima University, 2-1 Minami-Josanjima, Tokushima 770-8506, Japan
Muhamad Faiz Farhan bin Mohamad Shah Department of Chemical Science and Technology, Faculty of Engineering, Tokushima University, 2-1 Minami-Josanjima, Tokushima 770-8506, Japan
Mohd Warikh bin Abd Rashid Faculty of Manufacturing Engineering, Universiti Teknikal Malaysia Melaka, Hang Tuah Jaya, 76100 Durian, Tunggal, Melaka, Malaysia.
Toshihiro Moriga Department of Chemical Science and Technology, Faculty of Engineering, Tokushima University, 2-1 Minami-Josanjima, Tokushima 770-8506, Japan

Abstract

In-situ X-ray diffractometry and dilatometry were applied to evaluate substitution effects in Zr2-xTix(WO4)(PO4)2 on negative thermal expansion behavior. The substitution induced a reduction of all the lattice parameter a, b and c and suppressed
the coefficient of negative thermal expansion (α= - 2.54×10-6 K-1 for x=0 and α= - 1.52×10-6 K-1 for x=0.20). However, the coefficients obtained by the dilatometry were larger than those obtained by X-ray diffractometry, maybe due to preferred orientation of grains in the tested bar.

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