TY - JOUR
T1 - Crystallization kinetics and dielectric properties of nanocrystalline lead strontium barium niobates
AU - Cheng, Ching Tai
AU - Lanagan, Michael
AU - Lin, Jiang Tsair
AU - Jones, Beth
AU - Pan, Ming Jen
N1 - Funding Information:
We wish to acknowledge the financial support from the Ministry of Economics Affairs (MOEA) of Taiwan, Republic of China under the Contract No. D325KF1100 and ZM2511I100, and the United States Department of Energy and the Office of Naval Research.
PY - 2005/2
Y1 - 2005/2
N2 - The crystallization kinetics and phase developments of PbO-BaO-SrO-Nb2O5-B2 O3-SiO2-based glass-ceramics was investigated. Lead strontium barium niobate, (Pb,Sr,Ba)Nb2O6, with a tetragonal tungsten-bronze structure formed as the major crystalline phase, which showed evidence of both surface and bulk crystallization. The results of the present study showed significant evidence of a change in crystallization mechanism between the as-heated surface and the interior of glass-ceramics. This effect could be attributed to a volatilization of PbO taken place readily on the surface region of sample during heating. The grain size of the bulk-nucleated (Pb,Sr,Ba)Nb2O6 crystals was substantially smaller than that of surface-nucleated crystals. This result facilitated meeting the capacitors as high energy density application due to the ultrafine grains (<60 nm) obtained. The dielectric constant increased from 27 for the as-quenched glass to 200 for a highly crystallized glass-ceramic, which was attributed to a significant volume fraction of (Pb, Sr, Ba)Nb2O6 phase.
AB - The crystallization kinetics and phase developments of PbO-BaO-SrO-Nb2O5-B2 O3-SiO2-based glass-ceramics was investigated. Lead strontium barium niobate, (Pb,Sr,Ba)Nb2O6, with a tetragonal tungsten-bronze structure formed as the major crystalline phase, which showed evidence of both surface and bulk crystallization. The results of the present study showed significant evidence of a change in crystallization mechanism between the as-heated surface and the interior of glass-ceramics. This effect could be attributed to a volatilization of PbO taken place readily on the surface region of sample during heating. The grain size of the bulk-nucleated (Pb,Sr,Ba)Nb2O6 crystals was substantially smaller than that of surface-nucleated crystals. This result facilitated meeting the capacitors as high energy density application due to the ultrafine grains (<60 nm) obtained. The dielectric constant increased from 27 for the as-quenched glass to 200 for a highly crystallized glass-ceramic, which was attributed to a significant volume fraction of (Pb, Sr, Ba)Nb2O6 phase.
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U2 - 10.1557/JMR.2005.0054
DO - 10.1557/JMR.2005.0054
M3 - Article
AN - SCOPUS:28044456964
VL - 20
SP - 438
EP - 446
JO - Journal of Materials Research
JF - Journal of Materials Research
SN - 0884-2914
IS - 2
ER -