Thermal and physical properties of sodium niobate ceramics over a wide temperature range

Бондарев, В. С.; Карташев, А. В.; Горев, М. В.; Flerov, I. N.; Pogorel’tsev, E. I.; Мolokeev, Maxim S.; Raevskaya, S. I.; Suzdalev, D. V.; Raevski, I. P.

doi:10.1134/s1063783413040045

Cited by 19 publications

(19 citation statements)

References 26 publications

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“…These anomalies seem to correspond to the transition from Q to P (or R) phase. Near this temperatures, anomalies in the temperature dependence of the thermal expansion coefficient were observed for NaNbO 3 ceramics from the same batch as the studied one . In the tan δ ( T ) curve only a change of the slope at ≈280 °C is observed within 200–350 °C temperature range (see the inset (b) in Figure ).…”

Section: Resultsmentioning

confidence: 66%

“…Note that in epitaxial NaNbO 3 nanofilms, large mismatch strains also induce the Q phase . Thus, both crystals and ceramics of NaNbO 3 fabricated by various methods can contain a significant (up to 50%) amount of the Q phase . The phase transition temperature from the Q phase to the next high‐temperature nonpolar phase (either phase P or R according to Megaw's notation) determined in various studies differs greatly (from 160 to 360 °C) .…”

Section: Introductionmentioning

confidence: 99%

“…Thus, both crystals and ceramics of NaNbO 3 fabricated by various methods can contain a significant (up to 50%) amount of the Q phase . The phase transition temperature from the Q phase to the next high‐temperature nonpolar phase (either phase P or R according to Megaw's notation) determined in various studies differs greatly (from 160 to 360 °C) . Based on transmission electron microscopy (TEM) data, Chen and Feng suggested that NaNbO 3 is heterogeneous in both phases and domains even within the microregions and undergoes a series of phase transitions: Q–Q 1 (250–280 °C), Q 1 –Q 2 (450 °C), and Q 2 –S (500 °C) …”

Section: Introductionmentioning

confidence: 99%

“…The scope of the current work was the study of the temperature dependences of the pyroelectric coefficient p and remanent polarization P r for NaNbO 3 ceramics containing a substantial amount of the Q phase. For this purpose, we studied dielectric and pyroelectric properties of NaNbO 3 ceramics containing about 30% of the Q phase according to the data of our previous studies on heat capacity and thermal expansion . Both the pyroelectric coefficient and remanent polarization values were determined from the thermally stimulated current (TSC)—temperature curves, i.e., by the Bayer–Roundy method .…”

Section: Introductionmentioning

confidence: 99%

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Dielectric and Pyroelectric Properties of Sodium Niobate Ceramics Containing Inclusions of Ferroelectric Q Phase

Raevskaya

Malitskaya

Chou

et al. 2019

Physica Status Solidi (a)

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For sodium niobate (NaNbO 3 ) ceramics containing in the nonpoled state about 30% of the ferroelectric Q phase, the temperature dependences of the dielectric constant ε and pyroelectric coefficient p are studied. The results obtained show that the transition from the Q phase into the high-temperature nonpolar phase seems to be a diffuse one and the remanent polarization remains nonzero up to %370 C, i.e., well above the temperature of the p(T ) maximum (%270 C). Poled NaNbO 3 ceramics possess high figures of merit for pyroelectric sensors and NaNbO 3 -based materials are prospective for application in the noncooled infrared detectors.

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Section: Resultsmentioning

confidence: 66%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dielectric and Pyroelectric Properties of Sodium Niobate Ceramics Containing Inclusions of Ferroelectric Q Phase

Raevskaya

Malitskaya

Chou

et al. 2019

Physica Status Solidi (a)

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“…The definitions of p and FOMs are given by: 47,48 (1) p = I (T) A × (dT∕dt) where I(T), dT/dt, A, tanδ, ε r , ε 0 , and C v , represent the pyroelectric current, heating rate (2 K min −1 ), sample's electrode area, dielectric loss, relative dielectric constant, permittivity of free space (8.85 × 10 −12 F m −1 ), and specific heat capacity (~3.0 J cm −3 K −1 ), respectively. 32,49 According to the abovementioned equations, the value of pyroelectric coefficient depends only on the pyroelectric current. However, the values of the F d , F v , and F i are related to the C v , ε r , and tanδ as well.…”

Section: Piezoelectric Characteristics and Depolarization Performancementioning

confidence: 99%

Significantly enhanced pyroelectric performance in novel sodium niobate‐based lead‐free ceramics by compositional tuning

et al. 2019

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In this study, (1 − x)NaNbO3–xBa0.6(Bi0.5K0.5)0.4TiO3 (abbreviated as NN‐xBBKT, x = 0.05, 0.10, 0.15, and 0.20) lead‐free pyroelectric ceramics were synthesized by conventional solid‐state reaction method. Moreover, their microstructure, phase structure, dielectric, ferroelectric, piezoelectric, and pyroelectric characteristics were studied systematically. The X‐ray diffraction result showed that the phase structure of NN‐xBBKT ceramics changed from orthorhombic to tetragonal and finally became pseudocubic symmetry. The ferroelectric‐paraelectric phase transition temperature and depolarization temperature shifted to lower temperature with the increase in BBKT content. Furthermore, with increasing BBKT content, piezoelectric coefficient, figures of merit, and pyroelectric coefficient first increased and then decreased. The optimum pyroelectric properties (eg Fd = 0.81 × 10−5 Pa−1/2, Fv = 1.02 × 10−2 m2 C−1, Fi = 1.04 × 10−10 m V−1, and p = 3.11 × 10−8 C cm−2 K−1) were observed in sample composition with x = 0.15. More importantly, the pyroelectric coefficient of ceramic with x = 0.15 also displayed relatively high thermal stability because of high depolarization temperature (~110°C). These parameters demonstrate that the novel Pb‐free NaNbO3‐based ceramics form an important class of pyroelectric material with broad range of application prospect.

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Associating and Tuning Sodium and Oxygen Mixed‐Ion Conduction in Niobium‐Based Perovskites

Gouget

Mauvy

Chung

et al. 2020

Adv Funct Materials

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Pure ionic conductors as solid‐state electrolytes are of high interest in electrochemical energy storage and conversion devices. They systematically involve only one ion as the charge carrier. The association of two mobile ionic species, one positively and the other negatively charged, in a specific network should strongly influence the total ion conduction. Nb5+‐ (4d0) and Ti4+‐based (3d0) derived‐perovskite frameworks containing Na+ and O2− as mobile species are investigated as mixed ion conductors by electrochemical impedance spectroscopy. The design of Na+ blocking layers via sandwiched pellet sintered by spark plasma sintering at high temperatures leads to quantified transport number of both ionic charge carriers tNa+ and tO2−. In the 350–700 °C temperature range, ionic conductivity can be tuned from major Na+ contribution (tNa+ = 88%) for NaNbO3 to pure O2− transport in NaNb0.9Ti0.1O2.95 phase. Such a Ti‐substitution is accompanied with a ≈100‐fold increase in the oxygen conductivity, approaching the best values for pure oxygen conductors in this temperature range. Besides the demonstration of tunable mixed ion conduction with quantifiable cationic and anionic contributions in a single solid‐state structure, a strategy is established from structural analysis to develop other architectures with improved mixed ionic conductivity.

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Thermal and physical properties of sodium niobate ceramics over a wide temperature range

Cited by 19 publications

References 26 publications

Dielectric and Pyroelectric Properties of Sodium Niobate Ceramics Containing Inclusions of Ferroelectric Q Phase

Dielectric and Pyroelectric Properties of Sodium Niobate Ceramics Containing Inclusions of Ferroelectric Q Phase

Significantly enhanced pyroelectric performance in novel sodium niobate‐based lead‐free ceramics by compositional tuning

Associating and Tuning Sodium and Oxygen Mixed‐Ion Conduction in Niobium‐Based Perovskites

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