Evidence of the stable existence of a morphotropic phase boundary in the BaTiO3–NaNbO3 system

Rosso, J. M.; Burato, J.A.; Freitas, V. F.; Silva, D.M.; Volnistem, Eduardo Azzolini; Santos, G. M.; Bonadio, T. G. M.; Dias, G. S.; Cótica, L. F.; Santos, I. A.

doi:10.1016/j.matchemphys.2019.121794

Cited by 7 publications

(4 citation statements)

References 19 publications

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“…Furthermore, the additional degree of rotational freedom of polarization in the crystal structure of BaTiO 3 with the stabilization of the monoclinic phase together with the tetragonal one regarding the composition Ba 0.950 Bi 0.050 TiO 3 , it becomes a consistent explanation and its improved and unique properties can be contrasted with the formation of morphotropic phase boundaries. 37,39,77 In this line, the change in the trend of maximum permittivity as a function of frequency with an inflection point around 200 kHz is remarkable (Fig. 6b), common for all the samples even for pure BaTiO 3 .…”

Section: Resultsmentioning

confidence: 74%

“…To corroborate our hypothesis, the morphology and number of contributions of other plane families such as (101)/(110) and (111) were examined, comparing with the (002)/(200) reflections treated at 1000 °C for the three compositions taking the P 4 mm space group as reference 37 (Fig. 3b–d, respectively).…”

Section: Resultsmentioning

confidence: 79%

“…The existence of other stable polymorphs of BaTiO 3 is known as a function of temperature with rhombohedral structures below −90 °C ( R 3 m ), 54 orthorhombic structures between −90 and 0 °C ( Amm 2), 34 tetragonal structures between 0 and 120 °C ( P 4 mm ), 55 and cubic structures above 120 °C ( Pm 3̄ m ). 37 The cubic phase is paraelectric while the other three are ferroelectric, exhibiting large increases in the dielectric constant at temperatures close to the above-mentioned structural transition temperatures. 56 Interestingly, the stabilization of phases with unique polarization properties operating at RT is of potential applicability.…”

Section: Resultsmentioning

confidence: 92%

“…The formation and synthesis of stable BaTiO 3 polymorphs is of high interest since new polarization rotation mechanisms are provided, mainly favored by the mobility of Ti 4+ . 5,14 In this line, superposition of orthorhombic and tetragonal phases is obtained 34–36 and there are interesting works where the coexistence of morphotropic phase boundaries between cubic and tetragonal phases, 37 the formation of polymorphic phase boundaries 38 or monoclinic and/or orthorhombic phases induced by poling 35 are demonstrated. These are clear examples of the remarkable versatility of the perovskite structure of BaTiO 3 to form metastable structures that possess interesting dielectric properties and can be competitive to those commonly found in lead-based ceramics series.…”

Section: Introductionmentioning

confidence: 92%

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Local Diverse Polarization Optimized Comprehensive Energy‐Storage Performance in Lead‐Free Superparaelectrics

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To realize the ultrahigh W rec , it is essential to improve the above factors simultaneously.Recently, numerous studies have shown that linear dielectrics, ferroelectrics, and antiferroelectrics are difficult to achieve breakthroughs in energy-storage performance owing to the lack of high-polarization genes, poor efficiency caused by high P r , unstable antiferroelectric phase and antiferroelectric-ferroelectric phase transition, respectively. [2] To further enhance the W rec , transforming ferroelectrics and antiferroelectrics into relaxors is a simple but effective method, leading to the decreased domain size and P r . Interestingly, the strategies for the formation of relaxors are diverse. For relaxor antiferroelectrics, ultrahigh W rec of 12.2 and 18.5 J cm −3 can be achieved in NaNbO 3 (NN)-based ceramics using nanodomain engineering, causing a diffuse antiferroelectric to ferroelectric phase transition behavior to reduce the possibility of breakdown by reducing large transient currents and volume changes. [3] However, relatively low efficiency (η < 80%) limits their actual applications. The strategy of constructing phase boundary was designed to obtain excellent comprehensive energy-storage properties in AgNbO 3 (AN)-based ceramics. [4] For relaxor ferroelectrics, many strategies, such as composition adjustment, [5] domain/nanodomain engineering, [6] high-entropy design [7] were proposed to improve the energy-storage performance. Unfortunately, in addition to high-entropy strategy, there is no effective design to realize ultrahigh energy storage density (W rec ≥ 10 J cm −3 ) in relaxor ferroelectrics, making them comparable to relaxor antiferroelectric energy storage ceramics in competitiveness and development potential. [3,8] The control of polarization, domain or polar nanoregions (PNRs) configuration is an amusing approach to design new dielectric materials with enhanced energy-storage performance. Unmatched temperature range, [9] nanoscale polarization mismatch and reconstruction, [10] and crossover region [11] were adopted to form different domain configurations such as coexisting Ti-rich and Bi-rich PNRs, and coexisting nanodomain and PNRs. However, low W rec (<4 J cm −3 ) and medium η (≈80%) were obtained in relaxors due to the insufficient E b , fast polarization saturation and the existence of large size nanodomains. It is common that enhanced relaxation can result in a decreased polarization, and some methods should be used Lead-free dielectric ceramics with ultrahigh energy-storage performance are the core components used in next-generation advanced pulse power capacitors. However, the low energy storage density largely hinders their development towards miniaturization, lightweight, and integration. Here, an effective strategy of constructing local diverse polarization is designed in superparaelectrics to realize an ultrahigh energy storage density of ≈10.59 J cm −3 as well as a large efficiency of ≈87.6%. The excellent comprehensive energy-storage performance is mainly attributed to the desi...

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Lead-free NaNbO3-based ferroelectric perovskites and their polar polymer-ceramic composites: Fundamentals and potentials for electronic and biomedical applications

Rosso

Volnistem

Santos

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Ceramics International

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Evidence of the stable existence of a morphotropic phase boundary in the BaTiO3–NaNbO3 system

Cited by 7 publications

References 19 publications

A feasible pathway to stabilize monoclinic and tetragonal phase coexistence in barium titanate-based ceramics

A feasible pathway to stabilize monoclinic and tetragonal phase coexistence in barium titanate-based ceramics

Local Diverse Polarization Optimized Comprehensive Energy‐Storage Performance in Lead‐Free Superparaelectrics

Lead-free NaNbO3-based ferroelectric perovskites and their polar polymer-ceramic composites: Fundamentals and potentials for electronic and biomedical applications

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