TY - JOUR
T1 - Crystallization and second harmonic generation in potassium-sodium niobiosilicate glasses
AU - Aronne, Antonio
AU - Fanelli, Esther
AU - Pernice, Pasquale
AU - Peli, Simone
AU - Giannetti, Claudio
AU - Ferrini, Gabriele
PY - 2009
Y1 - 2009
N2 - Transparent glasses having molar composition (23−x)K2O·xNa2O·27Nb2O5·50SiO2 (x=0, 5, 10, 15 and 23) have been synthesized by the melt-quenching technique and their devitrification behaviour has been investigated by DTA and XRD. Depending on the composition, the glasses showed a glass transition temperature in the range 660–680 °C and devitrified in several steps. XRD measurements showed that the replacement of K2O by Na2O strongly affects the crystallization behaviour. Particularly, in the glasses with only potassium or low sodium content the first devitrification step is related to the crystallization of an unidentified phase, while in the glass containing only sodium, NaNbO3 crystallizes. For an intermediate sodium content (x=10 and 15) a potassium sodium niobate crystalline phase, belonging to the tungsten-bronze family, is formed by bulk nucleation. This system looks promising to produce active nanostructured glasses as the tungsten-bronze type crystals have ferroelectric, electro-optical and non-linear optical properties. Preliminary measurements evidenced SHG activity in the crystallized glasses containing this phase.
AB - Transparent glasses having molar composition (23−x)K2O·xNa2O·27Nb2O5·50SiO2 (x=0, 5, 10, 15 and 23) have been synthesized by the melt-quenching technique and their devitrification behaviour has been investigated by DTA and XRD. Depending on the composition, the glasses showed a glass transition temperature in the range 660–680 °C and devitrified in several steps. XRD measurements showed that the replacement of K2O by Na2O strongly affects the crystallization behaviour. Particularly, in the glasses with only potassium or low sodium content the first devitrification step is related to the crystallization of an unidentified phase, while in the glass containing only sodium, NaNbO3 crystallizes. For an intermediate sodium content (x=10 and 15) a potassium sodium niobate crystalline phase, belonging to the tungsten-bronze family, is formed by bulk nucleation. This system looks promising to produce active nanostructured glasses as the tungsten-bronze type crystals have ferroelectric, electro-optical and non-linear optical properties. Preliminary measurements evidenced SHG activity in the crystallized glasses containing this phase.
KW - NIOBIUM SILICATE-GLASSES
KW - NONISOTHERMAL CRYSTALLIZATION
KW - OPTICAL NONLINEARITY
KW - PHASE-TRANSITION
KW - potassium-sodium niobiosilicate glasses
KW - second harmonic generation
KW - NIOBIUM SILICATE-GLASSES
KW - NONISOTHERMAL CRYSTALLIZATION
KW - OPTICAL NONLINEARITY
KW - PHASE-TRANSITION
KW - potassium-sodium niobiosilicate glasses
KW - second harmonic generation
UR - http://hdl.handle.net/10807/35990
UR - http://www.sciencedirect.com/science/article/pii/s0022459609003715
U2 - 10.1016/j.jssc.2009.07.052
DO - 10.1016/j.jssc.2009.07.052
M3 - Article
SN - 0022-4596
VL - 182
SP - 2796
EP - 2800
JO - Journal of Solid State Chemistry
JF - Journal of Solid State Chemistry
ER -