Crystal growth and dielectric characterization of crystals derived from the solid-solution Ba{sub (1-x)}Na{sub x}Ti{sub (1-x)}Nb{sub x}O{sub 3} (BTNN)
Journal Article
·
· Materials Research Bulletin
- ICMCB-CNRS, Universite de Bordeaux, 87 av. Schweitzer, 33608 Pessac (France)
- UDTS, 2 Bd. Frantz Fanon, BP. 140 Alger-7 Merveilles, 16200 Alger (Algeria)
Single crystals of (1 - x)BaTiO{sub 3} + xNaNbO{sub 3} (BTNN) for x = 0.84 were obtained by high temperature solution growth using Na{sub 2}B{sub 4}O{sub 7} as solvent. The room temperature crystal structure of BTNN 16/84-phase was determined from X-ray single crystal diffraction data, in the tetragonal system with space group P4bm. The refinement from 246 independent reflections led to the following parameters: a = b = 5.5845(3) A, c = 3.9453(2) A, V = 123.041(11) A{sup 3}, Z = 2, with final cR{sub wp} = 0.150 and R{sub B} = 0.041. The structure of BTNN 16/84-phase can be described as a three-dimensional framework built up from (Nb-Ti)O{sub 6} octahedra with Na and Ba in the dodecahedral site of perovskite-like type. Some mm{sup 3}-sized crystals have been selected and various dielectric measurements (ferroelectric, pyroelectric, and piezoelectric) have been performed. Transition from paraelectric to ferroelectric state at around 460 K has been observed to be in good agreement with ceramics of closer composition. Dielectric, piezoelectric and pyroelectric measurements on crystal confirm the ferroelectric behaviour of BTNN 16/84.
- OSTI ID:
- 22202521
- Journal Information:
- Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 12 Vol. 44; ISSN MRBUAC; ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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