Synthesis and crystal structure of the rare earth borogermanate EuGeBO₅

Abstract

The synthesis and crystal structure of the rare earth borogermanate EuGeBO5 are reported. It is synthesized by high-temperature solid-state reaction and crystallizes in the monoclinic space group P21/c (no. 14) with the unit cell parameters a=4.8860(5), b=7.5229(8), c=9.9587(10) Å, and β=91.709(3)°. Its crystal structure features a polyanion-type layer (GeBO5)3− constructed by BO4 and GeO4 tetrahedra connected alternatingly. Eu3+ ions are located in cavities and are coordinated by eight O atoms. Various structures of the related compounds REMM′O5 (RE=rare earth metal; M=Si, Ge, and Sn; M′=B, Al, and Ga) are also discussed.

Luminescence properties in relation to controllable morphologies of Ba3[Ge2B7O16(OH)2](OH)(H2O):Eu3+ and its thermal conversion product Ba3Ge2B6O16:Eu3+

“…The luminescence properties of some rare earth borogermanates doped with different kinds of rare earth metals, such as LaBGeO 5 , EuGeBO 5 and Ln 2 GeB 2 -O 2 ,have been studied. [13][14][15][16][17] The properties and applications of luminescent materials are strongly dependent on their chemical composition, crystal structure, size and morphology. 18 For instance, Zhu et al have investigated the effects of trace alkali metal ion (Li + , Na + , K + ) doping on the morphology and photoluminescence properties, and they deemed that the morphology inuences the luminescence properties by geometric effects.…”