Abstract
A caesium lutetium(III) silicate, Cs3LuSi3O9, was synthesized by heating a pelletized mixture of Cs2CO3, Lu2O3 and SiO2 at 1273 K. Single crystals of the title compound were grown in a melted area of the pellet. Cs3LuSi3O9 is a single-chain silicate (ortho-rhom-bic space group Pna21) with a chain periodicity of six and is isostructural with Cs3 RE IIIGe3O9 (RE = Pr, Nd and Sm-Yb). The two symmetry-dependent [Si6O18]12- chains in the unit cell lie parallel to the [011] direction. The Lu3+ ions are octa-hedrally coordinated by O atoms of the silicate chains, generating a three-dimensional framework. Cs+ ions are located in the voids in the framework.
Highlights
Cs3LuSi3O9 is a sechser single-chain silicate, which crystallizes in the orthorhombic space group, Pna21
The Si—Obridge bond lengths in the title compound lie in the range 1.650 (4)–1.664 (4) A, and are slightly longer than the Si— Oterminal bond lengths [in the range 1.594 (4)–1.609 (4) A ; Table 1) and are in agreement with values found in other silicates
The angles Si1—Si2—Si3, Si2—Si3—Si1 and Si3—Si1—Si2 in the SiO4-linked zigzag chain in Cs3LuSi3O9 are 133.26 (7), 128.41 (7) and 134.64 (7), respectively. These values are larger than the angles observed in K6Lu2Si6O18, a sechser single-chain silicate with an Si1–Si2–Si3–Si3–Si2–Si1 sequence
Summary
A lutetium(III) silicate, Lu2SiO5, containing the highest atomic weight rare-earth element, has been studied as the host crystal of a scintillator for radiation detection (Dorenbos et al, 1994; Melcher & Schweitzer, 1992). In other quaternary silicate systems containing alkali-metal (A) and rare-earth (RE) elements, a number of single-chain silicates have recently been reported: LiScSi2O6 (space groups C2/c, P21/c; Arlt & Angel, 2000; Redhammer & Roth, 2004), NaYSi2O6 (P21/c; Tobbens et al, 2005), NaTbSi2O6 (P21/c; Schafer et al, 2012), Na3YSi3O9 (P212121; Maksimov et al, 1980), Na3RESi3O9 (RE = Y, Dy, Gd, P212121; Shannon et al, 1980), Na3RESi3O9 (RE = Y, Er, P212121; Ananias et al, 2002), Na3TmSi3O9 (P212121; Kahlenberg et al, 2015), K3HoSi3O9 (Pm21n; Ponomarev et al, 1988), K3RESi3O9 (RE = Ho, Tm, Lu, Pm21n; Filipenko et al, 1988), K3TbSi3O9 (Pm21n; Kostova et al, 2007), and K2.9Rb0.1ErSi3O9 (P1; WierzbickaWieczorek et al, 2010). We report the synthesis and structural characterization of Cs3LuSi3O9, the first silicate found to be isostructural with the germanates
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