Formation of α- and β-phase Mn-doped zinc silicate in supercritical water and its luminescence properties at Si/(Zn+Mn) ratios from 0.25 to 1.25

作者: Masafumi Takesue , Atsuko Suino , Kenji Shimoyama , Yukiya Hakuta , Hiromichi Hayashi

DOI: 10.1016/J.JCRYSGRO.2008.06.068

关键词: ManganeseStoichiometryLuminescenceSupercritical fluidPhase (matter)Analytical chemistryChemistryZincOxalateAmorphous solidInorganic chemistry

摘要: Abstract Mn-doped Zn 2 SiO 4 (ZSM) was synthesized in supercritical water under batch conditions to study the effect of Si molar ratio on ZSM phase formation and its luminescence properties. Precursors were prepared with zinc oxalate dihydrate, manganese oxalate, amorphous , where Mn/(Zn+Mn) a constant 0.02 Si/(Zn+Mn) ratios varied from 0.25 1.25. Reaction chosen be 400 °C, pressure 29 MPa, for reaction time 90 min. At stoichiometric 0.5, green-emitting α-Zn only formed. 0.55 1.25, an yellow-emitting β-Zn formed along unreacted . As increased, emission color materials changed green region yellow–green region. The main phases present system, ZnO–SiO –H O, at 90 min while other such as ZnSiO 3 O 7 (OH) ·H did not appear after these experimental conditions.

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