Formation and photoluminescence of zirconia dendrites in borosilicate glass-ceramics

Abstract

We prepared a borosilicate glass, in which the ZrO 2 phase is singly crystallizable, i.e., 15Na 2 O15ZrO 2 30B 2 O 3 40SiO 2 glass, and investigated the texture and morphology of the resulting glass-ceramics. ZrO 2 dendrites with a tetragonal system (hightemperature phase) were developed as initial phase, and the tetragonal phase was transformed to the monoclinic phase (lowtemperature phase) by elongation of the heat-treatment time, and finally the needle-/rod-like crystals on a scale of few hundred nanometers were obtained. The glass-ceramics with monoclinic ZrO 2 showed photoluminescence around 480 nm by excitation in the ultraviolet region. The effect of TiO 2 -addition on the photoluminescent property was also considered.

Temperature dependence of afterglow in zirconia and its optically-stimulated luminescence by bone-through irradiation for biological temperature probe

“…In addition, the size, morphology, physical and optical properties can be controlled by choice of appropriate synthetic conditions and dopants 11,12 . Pure ZrO 2 has different polymorphs, and the monoclinic phase exhibits a remarkable PL 13 . Furthermore, monoclinic ZrO 2 acquires a prominent afterglow property through the introduction of oxygen-defects, which are activated by the annealing 14,15 .…”

Glass-forming ability and ZrO2 saturation limits in the magnesium aluminosilicate system

“…In glass-ceramics, ZrO 2 is additionally widely employed as a nucleating agent: during thermal annealing of the starting glass, it typically induces the early precipitation of nanosized tetragonal ZrO 2 crystals (t-ZrO 2 ) [6][7][8][9][10][11], which act as heterogeneous nucleation centers for the subsequent controlled crystallization of the silicate matrix. Intensive research efforts have been more recently directed to the development of glass-ceramics with high crystalline ZrO 2 contents [12][13][14][15][16], to obtain rare-earth-free photoluminescence [17] or in the attempt of replicating the well-known transformation toughening typically observed in conventional ZrO 2 ceramics [18].…”

Repetitive afterglow in zirconia by pulsed near-infrared irradiation toward biological temperature sensing

“…Thermal treatment above the phase-transition temperature introduces oxygen defects, which are associated with the phase transition 13 . Since tetragonal ZrO 2 has been found to show no PL 20 , structural analysis of the obtained sample was performed by means of an X-ray diffraction (XRD; Cu-Kα). As the result, the phase of treated ZrO 2 was identified to be monoclinic (Fig.…”