Çeşitli borfosfat ve vanadat malzemelerin sentezi ve karakterizasyonu

In this thesis, two different synthesis methods namely, Solid State and Solution Combustion Synthesis Methods were used. First part of this study covers the synthesis of rare earth borophosphate compounds, LnB(PO4)2 (Ln= Nd, Ce, Pr, Sm, Eu, Yb, Tb, Ho, Tm, Lu) prepared by solid state method. The characterization studies were carried out by XRD, FT-IR, TG/DTA, SEM and EDX techniques. Monazite (Ln= Nd, Ce, Pr, Sm, Eu) and xenotime (Ln=Yb, Tb, Ho, Tm, Lu) type borophophates were successfully synthesized. From these compounds, YbB(PO4)2, HoB(PO4)2 and LuB(PO4)2 were indexed in tetragonal crystal system, space group: I41/amd. Their refined unit cell parameters were calculated as a=6.820(3) c=5.975(2), V=277.945 (YbB(PO4)2), a=6.891(5) c=6.031(7), V=286.46 (HoB(PO4)2) and a= 6.798(9) c= 5.962(6) V= 275.62 (LuB(PO4)2). The characteristic bands of PO4 and BO4 units of the obtained materials were examined with FT-IR. In the second part of this work, the fabrication of pyrovanadates (M2V2O7, M= Cu, Ni, Co, Zn, Mn) and orthovanadates (M3V2O8, M= Cu, Ni, Co, Zn, Mn, Mg) was studied by solution combustion synthesis method. Characterization studies showed that the orthorhombic α-Cu2V2O7, monoclinic β-Cu2V2O7, α-Zn2V2O7 and β-Mn2V2O7 as single phase whereas Co2V2O7 and Ni2V2O7 pyrovanadates were produced as multiphase products. For the orthovanadate compounds, Ni3V2O8 and Co3V2O8 in orthorhombic structures were found as a single phase while in the synthesis process of M3V2O8 containing Mg, Cu and Zn metals, the products were determined as mixture with pyrovanadates, M2V2O7 (M=Mg, Cu, Zn). During the synthesis process of Mn3V2O8 compound, α and β Mn2V2O7 were obtained.