KLaF4:Nd3+ doped transparent glass-ceramics processed by spark plasma sintering

Babu, S.; Balda de la Cruz, Rolindes; Fernández Rodríguez, Joaquín Manuel; Sedano Rodríguez, María de las Mercedes; Gorni, Giulio; Cabral, Aluisio Alves; Galusek, Dušan; Durán, Alicia; Pascual, María Jesús

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Date

2022-02-15

Author

Babu, S.

Balda de la Cruz, Rolindes

Fernández Rodríguez, Joaquín Manuel

Sedano Rodríguez, María de las Mercedes

Gorni, Giulio

Cabral, Aluisio Alves

Galusek, Dušan

Durán, Alicia

Pascual, María Jesús

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Estadisticas en RECOLECTA
(LA Referencia)

Journal of Non-Crystalline Solids 578 : (2022) // Article ID 121289

URI

http://hdl.handle.net/10810/56538

Abstract

[EN] Transparent oxyfluoride glass-ceramics (GCs) containing KLaF4 nanocrystals (NCs) doped with Nd3+ were prepared by Spark Plasma Sintering (SPS). Glass powder pellets were sintered under a vacuum atmosphere, optimizing the processing parameters such as particle size, pressure, temperature, and holding time to obtain full densification. Transparency decreased when decreasing the particle size due to higher carbon contamination from the die. The alpha-KLaF4 crystalline phase was identified by X-ray diffraction (XRD) and its average crystal size was 10-20 nm. High-resolution transmission electron microscopy (HR-TEM) confirmed the presence of KLaF4 nanocrystals with incorporated Nd3+ ions. Low-temperature site-selective emission and excitation spectra of Nd3+ ions confirmed that alpha-KLaF(4 )was the predominant polymorph, although a minor presence of beta- KLaF4 was also demonstrated.