Surface effect on the electrical and optical properties of barium titanate at room temperature

Chaib, H.; Eng, Lukas M.; Schlaphof, F.; Otto, Tobias

doi:10.1103/physrevb.71.085418

Cited by 25 publications

(13 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recently, several studies have been performed, especially in BaTiO 3 perovskite due to their excellent optical and electrical properties [1][2][3]. One attraction of this range of the visible spectrum is that the short wavelength permits higher density optical storage devices, as is evident in the latest generation of DVD players that are currently emerging.…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence of BaZrO3 explained by a order/disorded transformation

Aguiar

Simões

Paskocimas

et al. 2015

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

A hydrothermal (HTMW) microwave method was used to synthesize ordered-disordered BaZrO 3 (BZ) nanoparticles at temperature of 140°C with times ranging from 15 min to 2 h. X-ray diffraction results verified the formation of BZ crystallites at a soaking time of 2 h while infrared data showed no traces of carbonate. Field emission scanning microcopy revealed a homogeneous size distribution of nanometric BZ powders. HTMW produced nanoparticles of pure BZ phase, with a size ranging from 40 to 80 nm. These results are in agreement with Raman scattering values which show that the HTMW synthesis route is rapid and cost effective. This method could be used as an alternative to obtain BZ nanoparticles as compared to other chemical methods. Intense photoluminescence in disordered BZ powders was observed at room temperature. The key of mystery of the intense PL emission is related to order-disorder structural in BZ lattice.

show abstract

Section: Introductionmentioning

confidence: 99%

Photoluminescence of BaZrO3 explained by a order/disorded transformation

Aguiar

Simões

Paskocimas

et al. 2015

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

show abstract

“…The optical band gap values (E g ) was determined by the Wood and Tauc method [12], according to Eq. (1). In this equation, h is Planck's constant, ν is the radiation frequency (UV-vis), n indicates the type of electronic transition between bands (direct transition (n¼ ½), indirect (n ¼2), directly prohibited (n ¼½) and indirectly prohibited (n ¼3)) and α is a constant, or absorption coefficient, calculated by the Kubelka-Munk mathematical method [26].…”

Section: Resultsmentioning

confidence: 99%

“…BaTiO 3 ceramic material with perovskite structure has been a historical object of study carried out in an evolutionary and uninterrupted way. This interest has arisen from the possibility of wider applications of this material, because of its various properties, mainly electrical and optical [1]. In general, researchers have invested continuously in studies to improve or promote the properties of this compound, without changing its basic structure.…”

Section: Introductionmentioning

confidence: 99%

Defects or charge transfer: Different possibilities to explain the photoluminescence in crystalline Ba(Zr x Ti 1−x )O 3

Souza

Sasaki

Camacho

et al. 2016

Journal of Luminescence

View full text Add to dashboard Cite

In this work, BZT (Ba (Zr x Ti 1 À x)O 3), composite ceramic powder with x ¼0, 0.25, 0.50, 0.75 and 1 (mol) was prepared by the microwave-assisted hydrothermal method. The structural, morphological and optical properties of the compounds were determined by XRD, SEM, Raman, UV-vis and photoluminescence analysis. The results showed that the stability of the BZ phase was strongly influenced by the isomorphic Zr/Ti substitution, and that the BZ sample had the greatest structural order for short and long distances compared to the other. The BZT ceramic composite showed optical behavior also influenced by the concentration of Zr, resulting in a growing photoluminescence emission with increasing Zr ion in the network. The BZ sample showed higher photoluminescent intensity in a region including the entire visible spectrum. Although the effect of photoluminescence in these materials is dependent on the presence of defects, which produce excitons for radiative recombination, in the BZ compound, there might have been other effects causing the intense photoluminescence. In this case, high emission is associated with the a charge transfer between neighboring clusters [ZrO 6 ] in a nanoparticle surface interface, which in turn are joined to form BZ mesocrystals on a micrometer scale. The photoluminescence observed in the BZT compound had a predominantly white color, a feature that gives it high potential for applications in white light-emitting devices.

show abstract

“…Barium titanate, BaTiO 3 (BT), is a polymorphic compound, with a ferroelectric P4mm tetragonal (t) structure and a paraelectric Pm3m cubic structure above the Curie temperature, T C ¼ 120 C [1][2][3][4][5]. Other identified BT polymorphs include a P6 3 /mmc hexagonal (h) [6][7][8], a R3m rhombohedral (r) [6,9] and an Amm2 orthorhombic (o-BT-I) structure [6,9].…”

Section: Introductionmentioning

confidence: 99%

BaTiO₃nanoparticles of orthorhombic structure following a polymer precursor. Part II. A thermodynamic analysis

Ram

Jana²,

Kundu

2007

Philosophical Magazine

View full text Add to dashboard Cite

The growth of BaTiO 3 (BT) nanoparticles, via support of a polymer template of PVA molecules, in a new polymorph with Pnma orthorhombic crystal structure (o-BT-II) is proposed. A metal ion-polymer complex forms of small templates with selective degrees of the cationic loading and regeneration of small PVA molecules of reaction in solution. The species is a derived skeleton of Ba 2þ , Ti 4þ and O 2À after burning off the polymer in air and grows in a specific lattice structure, which shares a minimal value of the surface (or energy) per unit mass, S Ã o . The o-BT-II polymorph has a value of S Ã o as small as 1782.28 m 2 g À1 , compared with 2004.2 m 2 g À1 for the known polymorph (o-BT-I) or 2490.9 m 2 g À1 for t-BT (tetragonal). As a high-energy polymorph with crystallite size 15 nm, it converts slowly to t-BT via a composite structure at temperatures as low as 650 C in air.

show abstract

Surface effect on the electrical and optical properties of barium titanate at room temperature

Cited by 25 publications

References 34 publications

Photoluminescence of BaZrO3 explained by a order/disorded transformation

Photoluminescence of BaZrO3 explained by a order/disorded transformation

Defects or charge transfer: Different possibilities to explain the photoluminescence in crystalline Ba(Zr x Ti 1−x )O 3

BaTiO₃nanoparticles of orthorhombic structure following a polymer precursor. Part II. A thermodynamic analysis

Contact Info

Product

Resources

About

Surface effect on the electrical and optical properties of barium titanate at room temperature

Cited by 25 publications

References 34 publications

Photoluminescence of BaZrO3 explained by a order/disorded transformation

Photoluminescence of BaZrO3 explained by a order/disorded transformation

Defects or charge transfer: Different possibilities to explain the photoluminescence in crystalline Ba(Zr x Ti 1−x )O 3

BaTiO3nanoparticles of orthorhombic structure following a polymer precursor. Part II. A thermodynamic analysis

Contact Info

Product

Resources

About

BaTiO₃nanoparticles of orthorhombic structure following a polymer precursor. Part II. A thermodynamic analysis