Premium
Fabrication and Electrical Properties of Textured Sr 0.53 Ba 0.47 Nb 2 O 6 Ceramics by Templated Grain Growth
Author(s) -
Duran Cihangir,
TrolierMcKinstry Susan,
Messing Gary L.
Publication year - 2000
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2000.tb01536.x
Subject(s) - materials science , strontium barium niobate , acicular , crystallite , ceramic , analytical chemistry (journal) , mineralogy , pyroelectricity , grain growth , texture (cosmology) , fabrication , dielectric , microstructure , sintering , relative density , composite material , ferroelectricity , metallurgy , optoelectronics , chemistry , medicine , image (mathematics) , alternative medicine , chromatography , pathology , artificial intelligence , computer science
Textured Sr 0.53 Ba 0.47 Nb 2 O 6 ceramics with a relative density of >95% were fabricated using templated grain growth (TGG). Acicular KSr 2 Nb 5 O 15 template particles synthesized via a molten salt process were aligned by tape casting in a mixture of solid‐state‐synthesized SrNb 2 O 6 and BaNb 2 O 6 powders. The resulting ceramics possessed strong fiber texture along the polar axis ([001]) of the strontium barium niobate. Samples with 15.4 wt% templates attained a textured fraction of 0.82 after sintering at a temperature of 1450°C for 4 h. These materials showed peak dielectric constants of 7550 at 1 kHz, remanent polarizations of 13.2 μC/cm 2 , saturation polarizations of 21 μC/cm 2 (60%–85% of the single‐crystal value), piezoelectric strain coefficients of 78 pC/N (70%–85% of the single‐crystal value), and room‐temperature pyroelectric coefficients of 2.9 × 10 −2 μC·(cm 2 ·°C) −1 (52% of the single‐crystal value). These results show that TGG is a viable option for accessing single‐crystal properties in polycrystalline ceramics.