Predicting Oxygen Off-Stoichiometry and Hydrogen Incorporation in Complex Perovskite Oxides

Complex perovskite oxides of Sr0.5(Nb0.5Ta0.5)O3 were synthesized by reassembling (SrNb2O7)2− and (Sr1.5Ta3O10)2− nanosheets followed by topochemical dehydration with heat treatment. Atomic force microscopy (AFM) images showed that the thicknesses of the (SrNb2O7)2− and (Sr1.5Ta3O10)2− nanosheets were approximately 6 nm (7 unit layers) and 4 nm (3 unit layers), respectively. Raman scattering measurement has suggested that nanosheet-processed Sr0.5(Nb0.5Ta0.5)O3 with B-site-cation ordering has a superlattice-like structure composed of alternating layers of Sr0.5NbO3 and Sr0.5TaO3 along the c-axis. Nanosheet-processed Sr0.5(Nb0.5Ta0.5)O3 with B-site-cation ordering exhibited a dielectric permittivity of 42 (1 MHz), which was lower than that of solid-state-reacted samples (65) with disordered B-site cations.

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1110 First-Principles Study of Complex Perovskite Oxides for Novel Lead-Free Piezoelectric Materials Development

The Proceedings of The Computational Mechanics Conference ◽

10.1299/jsmecmd.2011.24.378 ◽

2011 ◽

Vol 2011.24 (0) ◽

pp. 378-379

Author(s):

Akira IWASAKI ◽

Yasutomo UETSUJI ◽

Kazuyoshi TUCHIYA

Keyword(s):

First Principles ◽

Piezoelectric Materials ◽

Perovskite Oxides ◽

Lead Free ◽

Complex Perovskite ◽

Materials Development ◽

First Principles Study

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Rapid and direct synthesis of complex perovskite oxides through a highly energetic planetary milling

Scientific Reports ◽

10.1038/srep46241 ◽

2017 ◽

Vol 7 (1) ◽

Cited By ~ 8

Author(s):

Gyoung-Ja Lee ◽

Eun-Kwang Park ◽

Sun-A Yang ◽

Jin-Ju Park ◽

Sang-Don Bu ◽

...

Keyword(s):

Direct Synthesis ◽

Perovskite Oxides ◽

Complex Perovskite

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DEVELOPMENT AND CHARACTERISATION OF Ba2RENbO6 (RE = Yb, Er AND Ho) AND POTENTIAL USE AS SUBSTRATE FOR SUPERCONDUCTING YBCO FILMS

Modern Physics Letters B ◽

10.1142/s0217984901002993 ◽

2001 ◽

Vol 15 (25) ◽

pp. 1101-1108 ◽

Cited By ~ 2

Author(s):

S. U. K. NAIR ◽

P. R. S. WARRIAR ◽

J. KOSHY

Keyword(s):

Phase Transition ◽

Loss Factor ◽

Perovskite Oxides ◽

Processing Conditions ◽

Complex Perovskite ◽

Lattice Constants ◽

Dielectric Constant And Loss ◽

Microwave Applications ◽

Potential Use ◽

A Current

A group of complex perovskite oxides Ba2RENbO6 (RE = Yb, Er and Ho) have been synthesised and developed for their use as substrate for YBa2Cu3O7-δ superconductors. These materials have a complex cubic perovskite ( A2BB′O6 ) structure with lattice constants, a=8.3–8.5 Å. Ba2RENbO6 did not show any phase transition in the temperature range 30–1100°C. The dielectric constant and loss factor of Ba2RENbO6 are in the range suitable for their use as substrate for microwave applications. YBa2Cu3O7-δ superconductors did not show any detectable chemical reaction with Ba2RENbO6 even under extreme processing conditions. Dip-coated YBa2Cu3O7-δ thick films on polycrystalline Ba2RENbO6 substrate gave a T c (0) of 92 K and a current density of ~ 1.2 × 104 A cm-2.

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