Order and Disorder in Perovskites and Relaxor Ferroelectrics

Blinc, R.

doi:10.1007/430_2006_050

Cited by 16 publications

(18 citation statements)

References 27 publications

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“…the focus of intense study due to interest in these properties [207]. Although ferroelectric domain formation and crystallographic orientation on the macroscale are well understood, complementary studies on the nanoscale are desired.…”

Section: Ters With Single Molecule Sensitivitymentioning

confidence: 99%

Tip-Enhanced Raman Imaging and Nanospectroscopy: Sensitivity, Symmetry, and Selection Rules

2007

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The fundamental mechanisms of tipenhanced Raman spectroscopy (TERS) have been investigated, including the role of the plasmonic excitation of the metallic tips, the nature of the optical tip-sample coupling, and the resulting local-field enhancement and confinement responsible for ultrahigh resolution imaging down to just several nanometers. Criteria for the distinction of near-field signature from far-field imaging artifacts are addressed. TERS results of molecules are presented. With enhancement factors as high as 10 9 , single-molecule spectroscopy is demonstrated. Spatially resolved vibrational mapping of crystalline nanostructures and determination of crystallographic orientation and domains is discussed making use of the symmetry properties of the tip scattering response and the intrinsic Raman selection rules.

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Section: Ters With Single Molecule Sensitivitymentioning

confidence: 99%

Tip-Enhanced Raman Imaging and Nanospectroscopy: Sensitivity, Symmetry, and Selection Rules

2007

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“…The displacement of the centers of charge relative to each other or alignment causes the existence of electric dipoles. The ferroelectrics are classified in two categories (1) displacive type ferroelectrics: it requires the existence of at least two distinct, physically equivalent arrangements of atoms or ions and (2) order-disorder type ferroelectrics: they require at least two equivalent orientations of molecular dipoles [24]. The structural transition from a high symmetry phase to a low symmetry phase is responsible for ferroelectric transitions.…”

Section: Brief Introduction To Ferroelectricsmentioning

confidence: 99%

Dielectric behavior of perovskite glass ceramics

Yadav

Gautam

2014

J Mater Sci: Mater Electron

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The recent developments of energy storage devices are concerned with larger energy storage ability, low loss and good temperature stability. It has a great technological importance in engineering science. The dielectric materials like ceramics and glass ceramics have great interest in electronic ceramic industry due to above concern. The ceramic dielectrics are used as a capacitive element in electronic circuits. The perovskite glass ceramics have very high dielectric constant and low dielectric loss. The high dielectric constant in glass ceramics is attributed to space charge polarization. In order to produce glass ceramics of high dielectric constant, barium titanate glass ceramics is the first discovered ferroelectric perovskite. In this review article, we are summarizing the dielectric behavior of perovskite glass ceramics such as

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“…We thus employed 13 C high-resolution NMR with cross-polarization and magic angle spinning (CP-MAS). CP-MAS NMR has been used with great success to elucidate the mechanism of the phase transition in several H-bonded ferroelectrics. − The use of single crystals in conjunction with CP-MAS NMR has provided significantly higher resolutions than from powders, thus allowing tracking of individual groups that are subtly different in their electronic structure. − Theoretical (density functional theory (DFT)) calculations are carried out to support the peak assignment and structural changes. Two-dimensional 13 C spectra provide additional information on the atomic diffusion among the clusters formed above the ferroelectric transition.…”

Section: Introductionmentioning

confidence: 99%

Understanding Ferroelectricity in the Pb-Free Perovskite-Like Metal–Organic Framework [(CH₃)₂NH₂]Zn(HCOO)₃: Dielectric, 2D NMR, and Theoretical Studies

et al. 2017

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Dimethylammonium zinc formate ([(CH3)2NH2]Zn(HCOO)3 or DMZnF) is a model system for the study of hybrid perovskite-like dielectrics. It undergoes a phase transition from the paraelectric to ferroelectric phase at ∼166 K, as observed via NMR spectra. The mechanism of this phase transition has been shown to have contributions from ordering of the hydrogen bonds between [(CH3)2NH2]+ (DMA+) and the formate groups as well as buckling of the metal-formate framework, but the transition dynamics and atomistic mechanism are not fully clear. This work presents dielectric constant measurements as evidence of cluster formation of the low-temperature phase and the relaxor-like behavior of this metal–organic framework above the phase transition temperature. 13C CP-MAS is used to track the evolution of the chemical shift, T 1, and T 2 of the dimethylammonium cation and formate groups from room temperature to 120 K. 2D 13C–13C correlation measurements provide evidence of the formation of pretransitional clusters above the phase transition temperature. Density functional theory (DFT) calculations support the assignment of chemical shifts and the proposed model. The analysis of 13C CP-MAS spectra and DFT calculations is used to discuss the mechanism of the dielectric phase transition and the origin of relaxor-like behavior in DMZnF.

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Order and Disorder in Perovskites and Relaxor Ferroelectrics

Cited by 16 publications

References 27 publications

Tip-Enhanced Raman Imaging and Nanospectroscopy: Sensitivity, Symmetry, and Selection Rules

Tip-Enhanced Raman Imaging and Nanospectroscopy: Sensitivity, Symmetry, and Selection Rules

Dielectric behavior of perovskite glass ceramics

Understanding Ferroelectricity in the Pb-Free Perovskite-Like Metal–Organic Framework [(CH₃)₂NH₂]Zn(HCOO)₃: Dielectric, 2D NMR, and Theoretical Studies

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Order and Disorder in Perovskites and Relaxor Ferroelectrics

Cited by 16 publications

References 27 publications

Tip-Enhanced Raman Imaging and Nanospectroscopy: Sensitivity, Symmetry, and Selection Rules

Tip-Enhanced Raman Imaging and Nanospectroscopy: Sensitivity, Symmetry, and Selection Rules

Dielectric behavior of perovskite glass ceramics

Understanding Ferroelectricity in the Pb-Free Perovskite-Like Metal–Organic Framework [(CH3)2NH2]Zn(HCOO)3: Dielectric, 2D NMR, and Theoretical Studies

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Product

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Understanding Ferroelectricity in the Pb-Free Perovskite-Like Metal–Organic Framework [(CH₃)₂NH₂]Zn(HCOO)₃: Dielectric, 2D NMR, and Theoretical Studies