Abstract
A novel thermochromic pigment was developed by substituting vanadium for phosphorous in strontium zirconium phosphate, SrZr4(PO4)6. X-ray diffractometry confirmed that single-phase rhombohedral SrZr4(P1−xVxO4)6, SZPV, pigments with x values from 0 to 0.15 were successfully synthesized. The SZPV powder had a reddish yellow color. Diffuse reflectance UV–vis spectroscopy indicated that the color phase, ΔE* , of SZPV increased with increasing x values in the range of 0.05–0.15. SZPV exhibited a reversible thermochromic property in the range 30–170 °C. Furthermore, CaZr4(P1−xVxO4)6 with x = 0.05, CZPV, had a near-zero thermal expansion property and showed a larger thermal change of ΔE* in the range 30–170 °C, compared with those of SZPV with x = 0.05 and BaZr4(P1−xVxO4)6 with x = 0.05, BZPV. Rietveld analysis clarified that suppression of thermal expansion of the V–O distance of VO4 tetrahedra was effective for enhancing the thermochromic property of SZPV.
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