The study on the dielectric property and structure of perovskite titanate CdTiO<sub>3</sub>

Sun, Pai-Hsuan; Nakamura, Tetsurō; Shan, Yue Jin; Inaguma, Yoshiyuki; Itoh, Makoto

doi:10.1080/00150199808015031

Cited by 26 publications

(36 citation statements)

References 5 publications

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“…The calculated frequencies of modes active in IR reflectance and Raman scattering are compared with available experimental data 3,8,9 in Table III. For the Ramanactive modes, the results of the calculations agree well with the experimental data obtained on ceramic samples 3 and single crystals; 8 the typical relative deviation of frequencies is about 3%.…”

Section: Results Of the Calculationsmentioning

confidence: 99%

“…Therefore, the possibility of successive ferroelectric phase transitions in CdTiO 3 with varying temperature can be most likely ruled out. Possibly, the specific features observed in the dielectric constant of CdTiO 3 near 50 K 3,5,6 are associated with the existence of side minima of the total energy that are separated from the main minima by low potential barriers.…”

Section: Fig 3 Relative Contributions Of Different Modes With B1umentioning

confidence: 99%

“…Since then, this phase transition was studied by dielectric [3][4][5][6] and Xray 3,4,7 methods; using Raman scattering; 3,8 IR and submillimeter reflectance spectroscopy; 9 pyroelectric current measurements. 4 The specific features of the phase transition in CdTiO 3 are a smallness of the lattice distortions and a considerable scatter in the data on the phase transition temperature (50-82 K) and spontaneous polarization (0.002-0.009 C/m 2 ).…”

Section: Introductionmentioning

confidence: 99%

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Ferroelectric phase transition in orthorhombic CdTiO3: First-principles studies

Лебедев

2009

Phys. Solid State

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The crystal structures and phonon spectra of orthorhombic cadmium titanate with the P bnm structure and of its two possible ferroelectrically distorted phases with P bn21 and P b21m space groups were calculated from first principles within the density functional theory. The obtained structural parameters and frequencies of Raman-and infrared-active modes are in good agreement with available experimental data for the P bnm phase. Expansion of the total energy in a Taylor series of two order parameters showed that the ground state of the system corresponds to the P bn21 structure into which the P bnm phase transforms through a second-order phase transition without intermediate phases. A substantial discrepancy between the calculated and experimentally observed lattice distortions and spontaneous polarization in the polar phase was explained by quantum fluctuations as well as by existence of twinning and competing long-period structures.

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Section: Results Of the Calculationsmentioning

confidence: 99%

Section: Fig 3 Relative Contributions Of Different Modes With B1umentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ferroelectric phase transition in orthorhombic CdTiO3: First-principles studies

Лебедев

2009

Phys. Solid State

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“…The phase transition of CdTiO 3 has not been examined thoroughly enough, and the questions, about the crystal structure CdTiO 3 in the ferroelectric state, how the structure changes of the phase transition, and why the ferroelectricity occurs, have not been solved yet. In order to clarify the nature of the ferroelectric phase transition in CdTiO 3 , we carried out various studies such as measurements of the dielectric constant, specific heat, pyroelectricity, and the low-temperature powder X-ray diffraction on polycrystalline CdTiO 3 [4][5][6]. These studies have shown that the ferroelectric phase transition in CdTiO 3 is of the displascive type and of the second-order and the ferroelectric Curie temperature is of about 80 K. However, we could not determine the space group of the ferroelectric phase by the Rietveld method, since the variations of the structure between the low-and high-temperature phases were too small [5].…”

Section: Introductionmentioning

confidence: 99%

Ferroelectric Phase Transition in CdTiO 3 Single Crystal

et al. 2003

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Single-crystal X-ray diffraction measurements at low temperature were carried out using the image-plate technique in the vacuum chamber at BL02B1 of SPring-8. The intensity data were collected at 20 K, 70 K, and 150 K, 36 photographs being taken at each temperature. The systematic extinctions observed at 20 K could be summarized as h = 2n + 1 for (hk0) reflections. This observation together with the observations of the ferroelectricity at this temperature uniquely determine the space group as P2 1 ma though a previous report suggested the space group to be Pn2 1 a. The structure could be refined with this space group yielding R = 0.056 for 4359 reflections. The structure of CdTiO 3 at 150 K was found to be almost identical to the previously reported one, belonging to the space group Pnma.

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“…13 The structural and electrical properties of CdTiO 3 powders and films were investigated by Montenero et al 14 They prepared CdTiO 3 by sol-gel method in the form of bulk and thin film. Sun et al 15 studied the perovskite structure of CdTiO 3 and their dielectric properties. They prepared powder using solid state reaction by mixing CdO and TiO 2 and calcinated at 950 • C for 12 hours.…”

Section: Introductionmentioning

confidence: 99%

Charge carrier transport mechanisms in perovskite CdTiO3 fibers

2014

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Mechanism behind the high thermoelectric power factor of SrTiO3 by calculating the transport coefficients J. Appl. Phys. 113, 053705 (2013); 10.1063/1.4788809Generation-dependent charge carrier transport in Cu(In,Ga)Se2/CdS/ZnO thin-film solar-cells Electrical transport properties of electrospun cadmium titanate (CdTiO 3 ) fibers have been investigated using ac and dc measurements. Air annealing of as spun fibers at 1000 • C yielded the single phase perovskite fibers having diameter ∼600 nm -800 nm. Both the ac and dc electrical measurements were carried out at temperatures from 200 K -420 K. The complex impedance plane plots revealed a single semicircular arc which indicates the interfacial effect due to grain boundaries of fibers. The dielectric properties obey the Maxwell-Wagner theory of interfacial polarization. In dc transport study at low voltages, data show Ohmic like behavior followed by space charge limited current (SCLC) with traps at higher voltages at all temperatures (200 K -420 K). Trap density in our fibers system is N t = 6.27 × 10 17 /cm 3 . Conduction mechanism in the sample is governed by 3-D variable range hopping (VRH) from 200 K -300 K. The localized density of states were found to be N(E F ) = 5.51 × 10 21 eV −1 cm −3 at 2 V. Other VRH parameters such as hopping distance (R hop ) and hopping energy (W hop ) were also calculated. In the high temperature range of 320 K -420 K, conductivity follows the Arrhenius law. The activation energy found at 2 V is 0.10 eV.

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The study on the dielectric property and structure of perovskite titanate CdTiO₃

Cited by 26 publications

References 5 publications

Ferroelectric phase transition in orthorhombic CdTiO3: First-principles studies

Ferroelectric phase transition in orthorhombic CdTiO3: First-principles studies

Ferroelectric Phase Transition in CdTiO 3 Single Crystal

Charge carrier transport mechanisms in perovskite CdTiO3 fibers

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The study on the dielectric property and structure of perovskite titanate CdTiO3

Cited by 26 publications

References 5 publications

Ferroelectric phase transition in orthorhombic CdTiO3: First-principles studies

Ferroelectric phase transition in orthorhombic CdTiO3: First-principles studies

Ferroelectric Phase Transition in CdTiO 3 Single Crystal

Charge carrier transport mechanisms in perovskite CdTiO3 fibers

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The study on the dielectric property and structure of perovskite titanate CdTiO₃