TY - JOUR
T1 - The growth, structure and magnetic and dielectric properties of Ba 6Fe0.90Nb9.10O30 and K 4Fe1.56Nb6.44O21.4 single crystals
AU - Tai, Jean Kuo
AU - Li, You Yun
AU - Qi, Xiaoding
N1 - Funding Information:
The authors are grateful to the National Science Council of Taiwan, Republic of China for the financial support under the grant number: NSC 99-2221-E-006-129-MY3.
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2012
Y1 - 2012
N2 - Single crystals of Ba6Fe0.90Nb9.10O 30 and K4 (Fe1.56Nb6.44)O 21.4, were grown from high temperature solution at 1380 °C and 1150 °C, respectively, by the spontaneous nucleation method. Single-crystal X-ray diffraction confirmed that Ba6Fe0.90Nb 9.10O30 belonged to the tetragonal tungsten-bronze (TTB) structure, with the space group P4/mbm (No. 127) and the lattice parameters a = 12.5895(3) and c = 3.98910(10) Å. In contrast, K4Fe 1.56Nb6.44O21.4 did not crystallize in the TTB structure and had a orthorhombic lattice instead, of which the space group was Pnma (No. 62) and the lattice parameters were a = 6.5371(6), b = 3.8212(3), and c = 18.6967(16) Å. Crystal structure analysis showed that the centers of the anion polyhedra in both crystals had distorted from the sites of the cations. The estimation from the empirical equations showed that Ba6Fe 0.90Nb9.10O30 was ferroelectric below room temperature, whereas the ferroelectric transition temperature for K 4Fe1.56Nb6.44O21.4 was as high as 820 °C. Preliminary magnetic characterization suggested that Ba 6Fe0.90Nb9.10O30 was likely to be antiferromagnetic at low temperature, while K4Fe 1.56Nb6.44O21.4 was probably paramagnetic down to 10 K.
AB - Single crystals of Ba6Fe0.90Nb9.10O 30 and K4 (Fe1.56Nb6.44)O 21.4, were grown from high temperature solution at 1380 °C and 1150 °C, respectively, by the spontaneous nucleation method. Single-crystal X-ray diffraction confirmed that Ba6Fe0.90Nb 9.10O30 belonged to the tetragonal tungsten-bronze (TTB) structure, with the space group P4/mbm (No. 127) and the lattice parameters a = 12.5895(3) and c = 3.98910(10) Å. In contrast, K4Fe 1.56Nb6.44O21.4 did not crystallize in the TTB structure and had a orthorhombic lattice instead, of which the space group was Pnma (No. 62) and the lattice parameters were a = 6.5371(6), b = 3.8212(3), and c = 18.6967(16) Å. Crystal structure analysis showed that the centers of the anion polyhedra in both crystals had distorted from the sites of the cations. The estimation from the empirical equations showed that Ba6Fe 0.90Nb9.10O30 was ferroelectric below room temperature, whereas the ferroelectric transition temperature for K 4Fe1.56Nb6.44O21.4 was as high as 820 °C. Preliminary magnetic characterization suggested that Ba 6Fe0.90Nb9.10O30 was likely to be antiferromagnetic at low temperature, while K4Fe 1.56Nb6.44O21.4 was probably paramagnetic down to 10 K.
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U2 - 10.1016/j.proeng.2012.03.065
DO - 10.1016/j.proeng.2012.03.065
M3 - Conference article
AN - SCOPUS:84892623068
SN - 1877-7058
VL - 36
SP - 446
EP - 454
JO - Procedia Engineering
JF - Procedia Engineering
T2 - 2011 IUMRS International Conference in Asia, ICA 2011
Y2 - 19 September 2011 through 22 September 2011
ER -