Dielectric Investigations and Theoretical Calculations of Size Effect in Lead Titanate Nanocrystals

In this paper the dielectric properties of nanosize ferroelectric lead titanate crystals are presented. The PbTiO3 samples were prepared by pressing nanopowder into the plates and have been studied experimentally by dielectric permittivity measurements in a wide frequency and temperature range. The obtained TC dependence shows a critical change of behavior with increasing of mean nanoparticle size in a 9 nm region. The theoretical calculations based on Monte Carlo simulation were performed to describe such behavior of this material. It was shown that taking into account distribution of nanoparticle sizes in sample is possible to describe dielectric properties of PbTiO3 nanocrystals rather well.

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Interaction between ultra short pulses and a dense scattering medium by Monte Carlo simulation: consideration of particle size effect

Optics Communications ◽

10.1016/s0030-4018(03)01415-9 ◽

2003 ◽

Vol 220 (4-6) ◽

pp. 237-245 ◽

Cited By ~ 12

Author(s):

C Rozé ◽

T Girasole ◽

L Méès ◽

G Gréhan ◽

L Hespel ◽

...

Keyword(s):

Monte Carlo Simulation ◽

Particle Size ◽

Monte Carlo ◽

Size Effect ◽

Particle Size Effect ◽

Scattering Medium ◽

Short Pulses

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Polytetrafluoroethylene Films in Rigid Polyurethane Foams’ Dielectric Permittivity Measurements with a One-Side Access Capacitive Sensor

Polymers ◽

10.3390/polym13071173 ◽

2021 ◽

Vol 13 (7) ◽

pp. 1173

Author(s):

Ilze Beverte ◽

Ugis Cabulis ◽

Sergejs Gaidukovs

Keyword(s):

Dielectric Properties ◽

Dielectric Permittivity ◽

Low Frequency ◽

Capacitive Sensor ◽

Polyurethane Foams ◽

Active Area ◽

Ptfe Film ◽

Practical Applications ◽

Permittivity Measurements ◽

The Impact

As a non-metallic composite material, widely applied in industry, rigid polyurethane (PUR) foams require knowledge of their dielectric properties. In experimental determination of PUR foams’ dielectric properties protection of one-side capacitive sensor’s active area from adverse effects caused by the PUR foams’ test objects has to be ensured. In the given study, the impact of polytetrafluoroethylene (PTFE) films, thickness 0.20 mm and 0.04 mm, in covering or simulated coating the active area of one-side access capacitive sensor’ electrodes on the experimentally determined true dielectric permittivity spectra of rigid PUR foams is estimated. Penetration depth of the low frequency excitation field into PTFE and PUR foams is determined experimentally. Experiments are made in order to evaluate the difference between measurements on single PUR foams’ samples and on complex samples “PUR foams + PTFE film” with two calibration modes. A modification factor and a small modification criterion are defined and values of modifications are estimated in numerical calculations. Conclusions about possible practical applications of PTFE films in dielectric permittivity measurements of rigid PUR foams with one-side access capacitive sensor are made.

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Dielectric properties of material with random off-center defects: Monte Carlo simulation of relaxor ferroelectrics

Journal of Applied Physics ◽

10.1063/1.1415759 ◽

2001 ◽

Vol 90 (12) ◽

pp. 6345-6356 ◽

Cited By ~ 24

Author(s):

C.-C. Su ◽

B. Vugmeister ◽

A. G. Khachaturyan

Keyword(s):

Monte Carlo Simulation ◽

Monte Carlo ◽

Dielectric Properties ◽

Relaxor Ferroelectrics

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Monte Carlo simulation and reference hypernetted chain equation results for structural, thermodynamic, and dielectric properties of polar heteronuclear diatomic fluids

The Journal of Chemical Physics ◽

10.1063/1.471388 ◽

1996 ◽

Vol 104 (17) ◽

pp. 6710-6718 ◽

Cited By ~ 10

Author(s):

M. Lombardero ◽

C. Martín ◽

E. Lomba ◽

F. Lado

Keyword(s):

Monte Carlo Simulation ◽

Monte Carlo ◽

Dielectric Properties ◽

Chain Equation ◽

Hypernetted Chain

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Gold nanoparticle enhanced proton therapy: A Monte Carlo simulation of the effects of proton energy, nanoparticle size, coating material, and coating thickness on dose and radiolysis yield

Medical Physics ◽

10.1002/mp.13923 ◽

2019 ◽

Vol 47 (2) ◽

pp. 651-661 ◽

Cited By ~ 3

Author(s):

Dylan Peukert ◽

Ivan Kempson ◽

Michael Douglass ◽

Eva Bezak

Keyword(s):

Monte Carlo Simulation ◽

Monte Carlo ◽

Gold Nanoparticle ◽

Proton Therapy ◽

Coating Thickness ◽

Proton Energy ◽

Coating Material ◽

Nanoparticle Size

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Ab initio investigation of supported Au–Mn nanowires

Modern Physics Letters B ◽

10.1142/s0217984917501421 ◽

2017 ◽

Vol 31 (13) ◽

pp. 1750142 ◽

Cited By ~ 3

Author(s):

K. M. Tsysar ◽

S. V. Kolesnikov ◽

I. I. Sitnikov ◽

A. M. Saletsky

Keyword(s):

Monte Carlo Simulation ◽

Monte Carlo ◽

Critical Temperature ◽

Size Effect ◽

Ab Initio ◽

Kinetic Monte Carlo ◽

Magnetic Moments ◽

Ab Initio Study ◽

Kinetic Monte Carlo Simulation ◽

Strong Size Effect

We present an ab initio study of surface supported Au–Mn nanowires. Three different substrates are discussed: Cu(110), stepped Cu(111) and Si(001) surface. The emergence of stable antiferromagnetic (AFM) solutions in Au–Mn nanowires was found in all three cases. We found the nonzero magnetic moments of Mn atoms, however, the bulk of manganese is paramagnetic. The critical temperature of the Au–Mn wires is calculated by means of kinetic Monte Carlo simulation. The strong size-effect of the critical temperature is demonstrated.

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