title: Crystallization studies on rare-earth co-doped fluorozirconate-based glasses.
abstract: This work focuses on the structural changes of barium chloride (BaCl2) nanoparticles in fluorochlorozirconate-based glass ceramics when doped with two different luminescent activators, in this case rare-earth (RE) ions, and thermally processed using a differential scanning calorimeter. In a first step, only europium in its divalent and trivalent oxidation states, Eu2+and Eu3+, is investigated, which shows no significant influence on the crystallization of hexagonal phase BaCl2. However, higher amounts of Eu2+increase the activation energy of the phase transition to an orthorhombic crystal structure. In a second step, nucleation and nanocrystal growth are influenced by changing the structural environment of the glasses by co-doping with Eu2+and trivalent Gd3+, Nd3+, Yb3+, or Tb3+, due to the different atomic radii and electro-negativity of the co-dopants.
authors.affiliation: Centre for Innovation Competence SiLi-nano , Martin Luther University of Halle-Wittenberg, Karl-Freiherr-von-Fritsch-Str. 3, 06120 Halle (Saale), Germany.
authors.forename: C
authors.initials: C
authors.lastname: Paßlick
authors.forename: J A
authors.initials: JA
authors.lastname: Johnson
authors.forename: S
authors.initials: S
authors.lastname: Schweizer
keywords: crystallization; glass ceramics; nanocrystals; rare-earth doping