Thermal and dielectric properties of K3Nd(PO4)2 prepared by Pechini and solid state method

Structural, Raman, FT-IR and optical properties of Rb3Y2(PO4)3 and Rb3La(PO4)2 doped with Eu3+ ions

“…However, detailed information is available for K 3 La(PO 4 ) 2 , which is isomorphic with the rubidium compound and both phosphates form a solid solution in the whole concentration range. 5 Similar to other monoclinic double orthophosphates of potassium and RE, 13,14,[18][19][20] K 3 La(PO 4 ) 2 undergoes a structural transition at 1215 1C. 21 Unfortunately, the high temperature phase of K 3 La(PO 4 ) 2 has not been determined; however, it is expected that the phase has the hexagonal P % 3m1 structure.…”

“…This transition for K 3 RE(PO 4 ) 2 phosphates has a complicated course and, depending on the grain size and morphology, it can occur at a fixed temperature for the samples synthesised by the Pechini method or in a temperature range for the crystals and samples obtained by the SSR method. 18,29 In the former case, two thermal effects could be visible on the DSC curves instead of a single effect. The resulting heat of the single effect equals the total enthalpy change of the transition occurring in a temperature range.…”

Optical and thermal characterization of microcrystalline Na3RE(PO4)2:Yb orthophosphates synthesized by Pechini method (RE= Y, La, Gd)

“…The structural and optical properties of the double phosphates have been extensively studied for the last decade [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31]. However, sodium orthophosphates Na 3 RE(PO 4 ) 2 have been optically characterized [7, 19-21, 25, 31] mainly in its orthorhombic form.…”

New Solid Solutions and Phase Equilibria in the Rb3Y(PO4)2–BaRbPO4 System

“…This and data on the temperature range of existence of the compounds, their polymorphism, and the limitations as to synthesis techniques and materials can be acquired from appropriate phase diagrams. In the papers published so far by our team, we noted the limited stability of some of the double and ternary phosphates of rare‐earth elements, the existence of polymorphism, and the formation of solid solutions . All these characteristics should be known and taken into account when implementing new technologies based on rare‐earth element phosphates.…”

“…However, there are very numerous works on double phosphates such as: M 3 I RE (PO 4 ) 2 and M I M II PO 4 ( M I = an alkali metal or another monovalent element; M II = a alkaline‐earth metal or another divalent element; RE = a lanthanide element or Y, or Sc), which include respectively Rb 3 Y(PO 4 ) 2 and BaRbPO 4 . Double phosphates M 3 I RE (PO 4 ) 2 , both in the phase‐pure form and doped with different ions (mainly lanthanide ions), arouse considerable interest of various research centers in view of their use as luminophores and laser materials or their dielectric properties . Considering the large number of works dealing with the crystalline structures and polymorphism of M 3 I RE (PO 4 ) 2 phosphates, this literature review is limited to reports on double Rb 3 RE (PO 4 ) 2 phosphates.…”