Sintering, microstructure and microwave dielectric properties of rare earth orthophosphates, RePO4 (Re=La, Ce, Nd, Sm, Tb, Dy, Y, Yb)

Preparation of LaPO 4 :Ce 3+ ,Tb 3+ nanophosphors by mixed co-precipitation process and their photoluminescence properties

“…The phosphors had kept a pure LaPO 4 phase with the increase of calcining temperature, revealing the thermal and physical stability of the sample. It can also be seen from the XRD analysis that the LaPO 4 phosphors can be synthesized at a lower temperature with this mixed co-precipitation method compared to that of the solid-state reaction method [28]. The grain size D can be estimated by the Scherrer's formula D ¼ 0.89λ/βcosθ, where D is the average grain size, λ is the X-ray wavelength, θ and β is the Bragg angle and the corrected full-width at half-maximum (FWHM) of an observed peak, respectively.…”

Effects of P2O5/TiO2 ratio on the sintering behavior and microwave dielectric properties of TiP2O7

“…Subsequently the microwave dielectric properties of orthophosphates, such as rare earth orthophosphate RePO 4 (Re=La, Ce, Nd, Sm; Tb, Dy, Y, Yb) [5] and alkali earth orthophosphate A 3 (PO 4 ) 2 (A¼ Ca, Sr, Ba) [6,7], were also reported by other researchers. Both pyrophosphates and orthophosphates have good microwave dielectric properties coupled with a relatively low sintering temperature below 1200 1C.…”

Preparation and characterization of PbTi0(3) ceramics modified by a natural mixture of rare earth oxides of xenotime

“…Some experiences using rare earth oxides of xenotime were successful to prepare superconductors ceramics 11,12 . Xenotime is a phosphate that contains the oxides of heavy rare earth elements (from Gd to Lu), where Y, Yb, Er, and Dy oxides are the elements with higher concentration, as shown in Table 1 13,14 . These elements show ionic radii close to 18% smaller than the Pb ionic radii.…”