Improved electrical properties in La- and V-co-doped Na0.5Bi4.5Ti4O15 thin films

Do, D.; Kim, Jin Won; Kim, Sang Su

doi:10.1007/s00339-012-6891-9

Cited by 7 publications

(2 citation statements)

References 24 publications

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“…Co‐doping of Na 0.5 Bi 4.5 Ti 4 O 15 thin films with La and V reduced the leakage current and improved ferroelectric properties as well as the fatigue behavior up to 1.4 × 10 10 switching cycles . Similar behavior was found for La–W co‐doped BTO bulk ceramics .…”

Section: Fatigue Of Lead‐free Ferroelectricssupporting

confidence: 66%

Electric Fatigue of Lead‐Free Piezoelectric Materials

2014

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A considerable body of knowledge now exists from studies involving the development of lead-free piezoelectric ceramics and a number of high potential alternatives to current leadbased materials have been identified. Stability under cyclic electric fields is an important property of piezoelectric materials. Here, we review the research to date which shows that fatigue under cyclic electrical loading is prevalent in many lead-free piezoelectric ceramic compositions. However, the variety of compositions and mechanisms for piezoelectric behavior in these materials corresponds to significant variances in the nature of fatigue degradation and the likely mechanisms thereof, which do not directly parallel those of well-studied lead-based materials. In particular, the use of field-induced phase changes as an actuation mechanism provides distinctive fatigue behaviors. Particular attention is given to fatigue of ferroelectric and relaxor (ergodic and nonergodic) structures and their dependence upon temperature and electric field and the potential design of materials with high fatigue resistance.

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Section: Fatigue Of Lead‐free Ferroelectricssupporting

confidence: 66%

Electric Fatigue of Lead‐Free Piezoelectric Materials

2014

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“…Improved remanent polarization, dielectric constant and piezoelectric coefficient were observed with the increase of grain size. 33,34 Fig.…”

Section: Resultsmentioning

confidence: 99%

Composition dependence of phase structure and electrical properties of BiMnO₃-modified Bi_0.5(Na_0.8K_0.2)_0.5TiO₃ thin films

Zhai

Shen

et al. 2015

RSC Adv.

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In the present study, lead-free (1-x)Bi 0.5 (Na 0.8 K 0.2 ) 0.5 TiO 3 -xBiMnO 3 (abbreviated as BNKT-xBMO, with x ranged from 0 to 0.025) thin films were deposited on Pt/Ti/SiO 2 /Si substrates by sol-gel method, and the effects of BiMnO 3 addition on their crystal structure and electrical properties were systematically investigated. The results show that with increasing BiMnO 3 content the crystal structure undergoes the phase transition from a ferroelectric rhombohedral phase to rhombohedral-tetragonal coexisted phases to a relaxor pseudocubic phase.The superior ferroelectric, piezoelectric and dielectric properties were attained at x = 0.01 with remanent polarization 2P r ~14 µC/cm 2 , effective piezoelectric coefficient d 33 * ~116 pm/V and dielectric constant ε r ~270.The composition-dependent phase structure and optimal electrical properties indicated that the MPB-like behavior existed at around x = 0.01. Moreover, our study revealed that the end-member BiMnO 3 modified BNKT thin films provided a lead-free alternative in ferroelectric 2 random access memory (FRAM) and piezoelectric actuators application.3 for environmentally friendly devices, more and more attention has been paid to the investigation of lead-free composition systems. Currently, extensive studies are focused on (Bi 0.5 Na 0.5 )TiO 3 (BNT) and (K 0.5 Na 0.5 )NbO 3 (KNN) system because of their relatively high piezoelectric and ferroelectric properties. [8][9][10][11][12] For (Bi 0.5 Na 0.5 )TiO 3 , it has been expected to be a superior lead-free candidate material because of its good ferroelectricity and relatively high Curie temperature (T c ~320 o C). 13However, BNT ceramics and thin films have two major drawbacks: (ⅰ) a quite high coercive field, (ⅱ) high conductivity. 14 Compared with pure BNT, many researchers found that BNT-xBKT binary system showed the improved piezoelectric and dielectric properties due to the existent rhombohedral-tetragonal morphotropic phase boundary (MPB). [15][16][17][18][19][20] Whereas, the investigation of MPB is mainly focused on ceramics, due to the fine grain size and stress in thin films resulting in the MPB is difficult to be obtained.Up to now, some researches have confirmed that the hybridization between the Pb 6p and O 2p orbits was responsible for the high piezoelectric response in Pb-based piezoelectric materials. Considering the same electron configuration between Bi 3+ and Pb 2+ and bismuth-based perovskite system generally shows high piezoelectric and ferroelectricproperties, therefore, more and more attention has been paid to BiMeO 3 -modified (where Me = Al, Sc, Mn, Fe, etc.) BNT and 7 2θ around 47°, corresponding to a rhombohedral phase. 16,29 When x = 0.005, the (200) peak shows no apparent splitting, but some degree of broadening peak with left side bulged indicate the phase structure may be change from this composition. However, at x = 0.01 and 0.015, the {200} reflection peak shows significant difference from other compositions,suggesting that there may be two phases in the films. According...

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Structural, dielectric and piezoelectric properties of (Bi0.5Na0.5)TiO3–(Bi0.5K0.5)TiO3–Bi(Zn0.5Ti0.5)O3 thin films prepared by sol–gel method

Zeng

Zhao

et al. 2014

Ceramics International

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Improved electrical properties in La- and V-co-doped Na0.5Bi4.5Ti4O15 thin films

Cited by 7 publications

References 24 publications

Electric Fatigue of Lead‐Free Piezoelectric Materials

Electric Fatigue of Lead‐Free Piezoelectric Materials

Composition dependence of phase structure and electrical properties of BiMnO₃-modified Bi_0.5(Na_0.8K_0.2)_0.5TiO₃ thin films

Structural, dielectric and piezoelectric properties of (Bi0.5Na0.5)TiO3–(Bi0.5K0.5)TiO3–Bi(Zn0.5Ti0.5)O3 thin films prepared by sol–gel method

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Improved electrical properties in La- and V-co-doped Na0.5Bi4.5Ti4O15 thin films

Cited by 7 publications

References 24 publications

Electric Fatigue of Lead‐Free Piezoelectric Materials

Electric Fatigue of Lead‐Free Piezoelectric Materials

Composition dependence of phase structure and electrical properties of BiMnO3-modified Bi0.5(Na0.8K0.2)0.5TiO3 thin films

Structural, dielectric and piezoelectric properties of (Bi0.5Na0.5)TiO3–(Bi0.5K0.5)TiO3–Bi(Zn0.5Ti0.5)O3 thin films prepared by sol–gel method

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Composition dependence of phase structure and electrical properties of BiMnO₃-modified Bi_0.5(Na_0.8K_0.2)_0.5TiO₃ thin films