Microstructure and dielectric properties of epitaxial Bi2WO6 deposited by pulsed laser ablation

Hamada, Michiko; Tabata, Hitoshi; Kawai, Tomoji

doi:10.1016/s0040-6090(97)00244-7

Cited by 35 publications

(28 citation statements)

References 16 publications

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“…Bi 2 WO 6 (BW) has been regarded as a potential candidate for ferroelectric and piezoelectric materials because of its high Curie temperature of 940 C and high electromechanical coupling coefficient [26,38,72,118]. Especially, BW has the largest P s estimated from the structural data based on ionic model among BLSFs [90,113].…”

Section: ¼ 1: Bi 2 Wo 6 -Based Single Crystalsmentioning

confidence: 99%

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Defect Control and Properties in Bismuth Layer Structured Ferroelectric Single Crystals

Noguchi

Miyayama

2011

Lead-Free Piezoelectrics

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The static and dynamic behaviors of ferroelectric domains are the underlying basis of various functional properties of ferroelectric materials, such as dielectricity, piezoelectricity, ferroelectricity, and electro-optic and acoustic-optic effects. Since the performance of ferroelectric devices is governed by these behaviors, various techniques for enhancing device performance have been widely investigated with the aim of controlling ferroelectric domains [19,20,88,109]. Such control, however, is often prevented not only by a large leakage current but also by undesirable behaviors such as domain clamping [16,73,95], fatigue [17,98], aging [63,68], imprinting [110], and depoling [98]. Ferroelectric devices thus suffer from degraded polarization and poor reliability due to insufficient control over ferroelectric domains. It is considered that the poor polarization properties, fatigue, and aging, etc. are governed by the interaction between defects and ferroelectric domains.Bismuth layer-structured ferroelectrics (BLSFs) have attracted much attention because of their high Curie temperature (T C ) and larger spontaneous polarization (P s ). The relation between crystal structure and ferroelectric properties of BLSFs has been widely investigated because of their anisotropy of ferroelectric polarization [10,22,113]. In the crystal structure of BLSFs, perovskite layers (A mÀ1 B m O 3m+1 ) are sandwiched between Bi 2 O 2 layers, where m is the number of BO 6 octahedral layers with A-site cations in the perovskite layers, as shown in Fig. 14

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Section: ¼ 1: Bi 2 Wo 6 -Based Single Crystalsmentioning

confidence: 99%

“…Especially, BW has the largest P s estimated from the structural data based on ionic model among BLSFs [90,113]. Thin films [26,38] and crystals [108] of BW, however, suffer from a high leakage current, and polarization switching had not yet been achieved in the BW system.…”

Section: ¼ 1: Bi 2 Wo 6 -Based Single Crystalsmentioning

confidence: 99%

Defect Control and Properties in Bismuth Layer Structured Ferroelectric Single Crystals

Noguchi

Miyayama

2011

Lead-Free Piezoelectrics

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“…Among the large family of bismuthcontaining oxides, Bi 2 WO 6 keeps attracting research attention due to its wide range of physico-chemical properties including ferroelectricity, [35] nonlinear dielectric susceptibility [36] and oxide anion conductivity. [37] These interesting features are linked to the flexible Aurivillius-type layered structure of Bi 2 WO 6 that is constructed from alternating sheets of [WO 4 ] n 2-sheets consisting of corner-sharing WO 6 octahedra and [Bi 2 O 2 ] n 2+ slabs.…”

Section: Photocatalytically Active Bismuth-containing Oxidesmentioning

confidence: 99%

Targeted Synthesis and Environmental Applications of Oxide Nanomaterials

Zhou

Patzke

2010

Chimia

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Oxide nanomaterials are indispensable building blocks for a future nanotechnology, because they offer an infinite variety of structural motifs that lead to their widespread technical application. Therefore, flexible and tunable preparative strategies are required to convert this large family of materials onto the nanoscale. Although hydrothermal syntheses have proven especially suitable for this purpose, their reaction pathways and mechanisms often remain unknown so that they can be difficult to control. In the following, we summarize our comprehensive approach towards nanostructured functional oxides that is based on synthetic parameter optimizations, mechanistic in situ investigations and the characterization of environmentally relevant properties, e.g. in photocatalysis or sensor technology. The connection between preparative morphology control and the resulting materials properties is demonstrated for selected tungstate systems and bismuth-containing oxides. Furthermore, different methods for the in situ monitoring of hydrothermal processes are discussed. 252 CHIMIA 2010, 64, No. 4 Young AcAdemics in switzerlAnd PArt iii doi:10.2533doi:10. /chimia.2010doi:10. .252 Chimia 64 (2010 Keywords: Hydrothermal synthesis · in situ EXAFS/EDXRD · Nanomaterials · Oxides · PhotocatalysisSince summer 2007, Greta R. Patzke is SNSF Professor (tenure track) at the Institute of Inorganic Chemistry at the University of Zurich. She was born 1974 in Bremen (Germany). From 1993 to 1997, she studied chemistry at the University of Hannover (Germany). Her diploma thesis covered solid state and computational chemistry.In 1999, she received her doctoral degree summa cum laude from the University of Hannover. Her work was supported by the Studienstiftung des Deutschen Volkes, and she worked with Prof. Michael Binnewies on the synthesis, characterization and properties of mixed oxides with special emphasis on crystal growth methods from the gas phase.She then moved to ETH Zürich and joined the group of Prof. Reinhard Nesper to work on her habilitation. During these years, she developed a wide range of research interests including structural inorganic chemistry, nanomaterials synthesis and the systematic application and investigation of hydrothermal techniques. She received the Venia Legendi for inorganic chemistry from ETH Zürich in October 2006. Her present research activities are focused on the targeted synthesis of functional inorganic materials, such as oxide nanomaterials for photocatalytic and sensor applications or bio-active polyoxometalates and hybrid materials thereof.

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“…When epitaxial regrowth or precise microstructural orientation is needed, sublayers of conducting oxides like, for instance, SrRuO 3 [58] or LaNiO 3 [59] are frequently used. Alternatively, efficient but expensive heavily doped Nb : SrTiO 3 substrates were used [60]. An alternative approach is the use of epitaxially grown metallic sublayers: platinum appears a good candidate, because it is contamination and oxidation resistant and, indeed, platinum layers with various orientations, namely (100), (111) and even (110) and very good in-plane ordering are currently mastered [61][62][63][64].…”

Section: Bottom Electrodesmentioning

confidence: 99%