Structural and Luminescent Properties of a Nasicon-Type Phosphate CuI0.5MnII0.25Zr2(PO4)3

✍ Scribed by A. Mouline; M. Alami; R. Brochu; R. Olazcuaga; C. Parent; G. Le Flem

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 199 KB
• Volume: 152
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.2000.8711

✦ Synopsis

The phosphate Cu I 0.5 Mn II 0.25 Zr 2 (PO 4 ) 3 can be obtained at 10003C by exchange reaction in Cu II 0.5 Zr 2 (PO 4 ) 3 . It crystallizes in the rhombohedral system (space group R3 ) with the parameters a h ‫؍‬ 8.8352(1) A s and c h ‫؍‬ 22.254(5) A s in the equivalent hexagonal cell. The structure re5ned by the Rietveld method is typical of Nasicon-type structure. Mn 2 ؉ ions occupy partially the M 1 site, while Cu ؉ ions are distributed over the M 1 and M 2 sites generated by the space group. This compound exhibits two 6uorescences, occurring in the violet and orange regions and assigned respectively to isolated Cu ؉ and Mn 2 ؉ ions. Two other luminescences detected in the blue and green range at low temperature correspond respectively to (Cu 2 ) ؉ and (Cu ؉ ) 2 pairs. E7cient energy transfer Cu ؉ PMn 2 ؉ is observed at room temperature strengthening the orange emission of Mn 2 ؉ in the M 1 site.