Growth and Characterization of a New Lead Lutetium Niobate with Lead Titanate Ferroelectric Crystal

doi:10.3724/SP.J.1077.2014.12720

Abstract

Abstract: A series of new lead lutetium niobate with lead titanate (1-x)Pb(Lu_1/2Nb_1/2)O₃-xPbTiO₃ (PLN-xPT) ferroelectric crystals were grown successfully by the top-seed solution growth technique. Structural analysis and electrical properties measurement showed that the crystals have high Curie temperatures and each composition had different performances. The temperature dependences of permittivity showed typical relaxor behavior in the rhombohedral phase region. Based on the measurement result, a solid state phase diagram in the low temperature range was established, which revealed a morphotropic phase boundary (MPB) in the composition of x = 0.49 to 0.51. Electric domains on (001) surface were observed by the polarizing microscope, in agreement with the X-ray diffraction data. Those compositions within MPB exhibited good piezoelectric properties, such as high coercive field E_c(>10 kV/cm) and high rhombohedral-tetragonal phase transition temperature T_RT (> 200℃). For PLN-0.49PT, it had a high Curie temperature T_c = 360℃ and a piezoelectric coefficient of d₃₃> 1600 pC/N. High Curie temperature and excellent piezoelectric property make this material a promising candidate which can operate in a wider temperature range.

Key words: relaxor ferroelectrics, crystal, PLNT, piezoelectric properties

CLC Number:

TQ174

LIU Ying, LONG Xi-Fa. Growth and Characterization of a New Lead Lutetium Niobate with Lead Titanate Ferroelectric Crystal[J]. Journal of Inorganic Materials, 2014, 29(1): 47-51.

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