Dependence of Crystal Structures and Scintillation Properties on Cerium Concentration in Gd2Si2O7:Ce Powder Synthesized by Solid State Reaction

Structural and luminescence properties of Gd2Si2O7:Ce prepared by solution combustion followed by heat treatment

“…In addition, more or less similar PL peak positions can also be assigned to the cerium self absorption. The observed excitation and emission features corroborate well with the results reported earlier for the triclinic GPS except for slight shifts towards higher wavelengths [17,18,25,35]. This may arise due to the presence of GSAP [14] in trace amounts and also changes in the synthesis and processing parameters for our samples.…”

“…The polymorphic character predominantly arises due to changes in Ce concentration and synthesis temperature. Conventionally, the Ce doped GPS [(Gd 1Àx Ce x ) 2 Si 2 O 7 ] is obtained by solid state reaction at 1500-1600°C for 10 h in three types of crystal structures; orthorhombic (when x = 0-0.1), triclinic (when x = 0.1-0.6) and monoclinic (when x = 0.6-1) [16,17]. It exhibits better optical properties as a scintillator than the Gd 2-SiO 5 :Ce in terms of its higher light output and superior energy resolution.…”

“…The synthesis by a conventional solid state route would otherwise require high temperature and long period of heating to obtain a well crystallized and phase pure GPS compound [16,17]. Thus a combustion method can be an effective route to reduce the heating temperature and duration due to a high homogeneity of the precursor.…”

Czochralski growth of 2 in. Ce-doped (La,Gd)2Si2O7 for scintillator application

“…From the point of view of scintillating performance, optimal Ce 3+ content with respect to the overall amount of host rare-earth cations is approximately 1.0 at.% regarding all rare-earths forming the pyrosilicate structure [10]. Unfortunately, this amount of Ce 3+ is not sufficient to improve stability of triclinic structure of the GPS compound [3] without partial substitution of Gd 3+ with La 3+ .…”

“…Recent findings demonstrated that La-GPS in high degree behaves as an actual original compound because its structural and chemical properties do not correspond to simple linear superposition of the characteristics of La2Si2O7 and GPS [1]. La-GPS have triclinic structure at least in the compositional range from La0.2Gd1.8Si2O7 to La1.2Gd0.8Si2O7 [3]. The end members La2Si2O7 and GPS possess other crystallographic symmetries.…”