Dielectric Relaxation, Ionic Conduction and Complex Impedance Studies on NaNo3 Fast Ion Conductor

Kumar, T. Vijay

doi:10.11648/j.ijmsa.20130206.12

Cited by 17 publications

(11 citation statements)

References 32 publications

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“…Moreover, Jonscher's universal relaxation law for dielectrics generally refers to displacement current J(t), whereas the position <x(t)> = xo t -n for a charged domain wall should contribute <dx(t)/dt> = xo t -n-1 to such currents, worsening the agreement in the present case. However, it is known [70][71][72] However, domain relaxations on a time scale of 20 hours, as in the present study, were reported [74][75][76][77] in 2014 with 50% decay reached in a few thousand seconds, as in our data. Very low (sub-Hz) frequency dielectric studies imply that these long relaxation times involve oxygen vacancy motion.…”

Section: Period Doublingsupporting

confidence: 72%

Nonequilibrium ferroelectric-ferroelastic 10 nm nanodomains: wrinkles, period-doubling, and power-law relaxation

Scott

Evans

Katiyar

et al. 2017

J. Phys.: Condens. Matter

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Since the 1935 work of Landau-Lifshitz and of Kittel in 1946 all ferromagnetic, ferroelectric, and ferroelastic domains have been thought to be straight-sided with domain widths proportional to the square root of the sample thickness. We show in the present work that this is not true. We also discover period doubling domains predicted by Metaxas et al (2008 Phys. Rev. Lett. 99 217208) and modeled by Wang and Zhao (2015 Sci. Rep. 5 8887). We examine non-equilibrium ferroic domain structures in perovskite oxides with respect to folding, wrinkling, and relaxation and suggest that structures are kinetically limited and in the viscous flow regime predicted by Metaxas et al in 2008 but never observed experimentally. Comparisons are made with liquid crystals and hydrodynamic instabilities, including chevrons, and fractional power-law relaxation. As Shin et al (2016 Soft Matter 12 3502) recently emphasized: 'An understanding of how these folds initiate, propagate, and interact with each other is still lacking'. Inside each ferroelastic domain are ferroelectric 90° nano-domains with 10 nm widths and periodicity in agreement with the 10 nm theoretical minima predicted by Feigl et al (2014 Nat. Commun. 5 4677). Evidence is presented for domain-width period doubling, which is common in polymer films but unknown in ferroic domains. A discussion of the folding-to-period doubling phase transition model of Wang and Zhao is included.

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Section: Period Doublingsupporting

confidence: 72%

Nonequilibrium ferroelectric-ferroelastic 10 nm nanodomains: wrinkles, period-doubling, and power-law relaxation

Scott

Evans

Katiyar

et al. 2017

J. Phys.: Condens. Matter

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“…, it is observed that the dielectric constant ε slowly decreases with increase in applied frequency f. This can be explained on the basis of oscillation of free dipoles in presence of alternating field. At very low frequencies (f << 1/τ, τ is the relaxation time), dipoles follow the electric field, while at very high frequencies (f >> 1/τ) dipoles begin to lag behind the field and ε slightly decreases 42,44 . It is also reported that the higher values of ε at low frequencies is due to space charge polarization or accumulation of charges at interfaces of sample and electrode 44 .…”

Section: 35kbtmentioning

confidence: 99%

Phase development and dielectric responses in PMNKBT solid solutions

Legesse¹,

Rao²

2019

IJCTR

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(1-x)PbMg1 /3 Nb 2/3 O 3 (PMN)-(x)K 0.5 Bi 0.5 TiO 3 (KBT)) materials(with x = 0.15,0.25 and 0.35) were prepared by double sintering conventional mixed-oxide method. X-ray powder diffraction patterns reveal that the crystal structure of PMN-KBT crystal changes from cubic to tetragonal symmetry with increasing amounts of KBT(x). The dielectric and ferroelectric properties of PMN-KBT crystals with different compositions near the morphotropic phase boundary (MPB) were studied systematically. The dielectric constant and dielectric loss tangent were measured as a function of both temperature and frequency from impedance data. With increasing KBT content, the frequency dependence of the transition temperature and the diffuseness of phase transition is observed in dielectric peak for sintered specimens. Highphase transition temperature (T m) of 319•C was obtained at 1 kHz for the composition x = 0.35. The diffuse phase transition(DPT) of the samples were assessed and the broadest dielectric peak occurs at x = 0.35, with diffusivity value  = 1.86, which leads to a morphotropic phase boundary in this system. In order to study ferroelectric property of (1-x) PMN-(x)KBT ceramics, polarization vs. electric field (P-E) hysteresis loops were traced at room temperature under different applied field. It is observed that the loop area is increased as the applied voltage has increased. The remnant polarization (P r)and coercive field (E C) are also increased as the applied voltage is increased.

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“…Untuk bagian riil kurva permittivitas, fenomena pada frekuensi rendah ini merupakan hasil kontribusi kuat dari akumulasi muatan pada daerah antar muka elektrolit dan elektroda [27], sedangkan untuk kurva rugi dielektrik merupakan akibat dari perpindahan ion di dalam material [28], seperti yang digambarkan sebagai ekor pada ujung kurva impedansi pada Gambar 3. Nilai permittivitas tersebut kemudian diikuti oleh daerah yang hampir tidak bergantung frekuensi pada daerah frekuensi lebih tinggi, yang diakibatkan oleh pembalikan medan listrik secara periodik dan cepat, yang mengakibatkan tidak ada lagi difusi dan vibrasi ion yang tersisa pada daerah frekuensi tersebut [29].…”

Section: Pendahuluanunclassified

SINTESIS DAN KAJIAN PERILAKU KONDUKTIVITAS KOMPOSISI BARU ELEKTROLIT PADAT (Li2O)x(P2O5)y

Jodi¹,

Zulfia²,

Sudjatno³

et al. 2017

jsmi

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SINTESIS DAN KAJIAN PERILAKU KONDUKTIVITAS KOMPOSISI BARU ELEKTROLIT PADAT (Li 2 O) x (P 2 O 5) y. Bahan elektrolit padat (Li 2 O) x (P 2 O 5) y dengan komposisi konten Li 2 O sebesar x = 24 %berat dan 28 %berat telah dipreparasi menggunakan teknik reaksi padat pada suhu di bawah suhu lelehnya. Paduan yang telah dipreparasi kemudian dikarakterisasi menggunakan Scanning Electron Microscopy (SEM) dan Electrochemical Impedance Spectroscopy (EIS) untuk diperiksa morfologi, sifat elektrokimia dan konduktivitasnya. Karakterisasi elektrokimia menunjukkan bahwa nilai konduktivitas kedua paduan berada pada orde 10-6 S/cm, setara dengan nilai konduktivitas paduan Li 4 P 2 O 7 yang dipreparasi pada suhu lebih tinggi dengan kandungan Li 2 O lebih banyak, dan lebih tinggi dari konduktivitas senyawa Li 3 PO 4. Taksiran nilai eksponen frekuensi dari formula konduktivitas AC, memperlihatkan bahwa kemungkinan sumber konduksi ion dalam bahan yang diamati salah satunya adalah aliran ion jarak jauh. Kurva rugi dielektrik menunjukkan bahwa konduksi dalam bahan elektrolit ini didominasi oleh konduksi DC.

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Dielectric Relaxation, Ionic Conduction and Complex Impedance Studies on NaNo3 Fast Ion Conductor

Cited by 17 publications

References 32 publications

Nonequilibrium ferroelectric-ferroelastic 10 nm nanodomains: wrinkles, period-doubling, and power-law relaxation

Nonequilibrium ferroelectric-ferroelastic 10 nm nanodomains: wrinkles, period-doubling, and power-law relaxation

Phase development and dielectric responses in PMNKBT solid solutions

SINTESIS DAN KAJIAN PERILAKU KONDUKTIVITAS KOMPOSISI BARU ELEKTROLIT PADAT (Li2O)x(P2O5)y

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