Wydział Chemii

Małgorzata Guzik

Magdalena Bieza

Elżbieta Tomaszewicz

Yannick Guyot

Georges Boulon

2018

Springer

Dordrecht

315-354

10.1007/978-94-024-1544-5_17

Quantum nano-photonics

978-94-024-1543-8

Naukowa

Angielski

Rozdział książki

As widely known, un-doped and rare earth-doped molybdates and tungstates are promising group which have attracted great attention in wide branches of optical material application not only as laser hosts but also as phosphors and scintillators. Most of laser host materials have been obtained as single crystals by Czochralski method. However, the materials in the form of transparent ceramics have comparable or even better important properties than single crystals.

Nowadays, a challenge is to obtain a high quality optical material based on new polycrystalline ceramics applied for laser sources, scintillators and phosphors and to improve manufacturing methods. Nevertheless, only few compositions of cubic transparent ceramics are actually well-developed, these include rare earth (RE³⁺)-doped garnets (Nd³⁺/Yb³⁺-doped Y₃Al₅O₁₂/Lu₃Al₅O_12, Ce³⁺ − doped Y₃Al₅O₁₂, fluorides (Yb³⁺-doped CaF₂), RE³⁺-doped sesquioxides (Nd³⁺/Yb³⁺-doped Lu₂O₃, Sc₂O₃, Y₂O₃) and also perovskite type BMT (Ba(MgZrTa)O₃) and un-doped spinel (MgAl₂O₄).

This is why our attention is focused on fabrication of new rare-earth doped molybdates or tungstates in the form of polycrystalline ceramics, unknown until now in the literature. The manufacture of ceramics takes less time, even only few days in contrast to 4–6 weeks to grow crystals by using the Czochralski method. In comparison with single crystals it is possible to receive samples highly activated by rare earth ions and of large size ceramics in much cheaper way without using expensive iridium or rhenium crucibles. Indeed, two conditions must be fulfilled to obtain transparent ceramics: the compounds should crystallize in the cubic system and the size of the crystallites must be in the order of tens of nanometers.

We present and discuss the structural (XRD and SEM analysis) and spectroscopic properties of three types of materials representing the family of Yb³⁺-doped molybdates and molybdato-tungstates synthesized by the high-temperature solid-state reaction for future new optical ceramics crystallizing in the cubic system: La₂Mo₂O₉ /La₂MoWO₉ /Y₆MoO₁₂. Yb³⁺ rare earth ions has been selected since they can be substitute with trivalent La³⁺ and Y³⁺ cations and then can play the role of a structural probe and, in addition, can be used as laser ions in these materials.

http://dx.doi.org/10.1007/978-94-024-1544-5_17