A monoclinic-tetragonal ferroelectric phase transition in lead-free (K0.5Na0.5)NbO3-<i>x</i>%LiNbO3 solid solution

Ge, Wenwei; Ren, Yang; Zhang, Jialiang; Devreugd, Christopher P.; Li, Jiefang; Viehland, Dwight

doi:10.1063/1.4716027

Cited by 55 publications

(43 citation statements)

References 62 publications

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“…This agrees well with the recently reported observation by high energy synchrotron XRD diffraction measurements of the local structure of monoclinic symmetry in KNN ceramics. 40 In this last case, also the more relevant phase is the T phase. As a consequence, the most probable origin of this behaviour must be related to the solubility of Sb 5+ ions into the perovskite structure.…”

Section: Resultsmentioning

confidence: 97%

Lead-Free Piezoceramics: Revealing the Role of the Rhombohedral–Tetragonal Phase Coexistence in Enhancement of the Piezoelectric Properties

Rubio-Marcos

López-Juárez²,

Rojas-Hernández

et al. 2015

ACS Appl. Mater. Interfaces

130

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Until now, lead zirconate titanate (PZT) based ceramics are the most widely used in piezoelectric devices. However, the use of lead is being avoided due to its toxicity and environmental risks. Indeed, the attention in piezoelectric devices has been moved to lead-free ceramics, especially on (K,Na)NbO3-based materials, due to growing environmental concerns. Here we report a systematic evaluation of the effects of the compositional modifications induced by replacement of the B-sites with Sb(5+) ions in 0.96[(K0.48Na0.52)0.95Li0.05Nb1-xSbxO3]-0.04[BaZrO3] lead-free piezoceramics. We show that this compositional design is the driving force for the development of the high piezoelectric properties. So, we find that this phenomenon can be explained by the stabilization of a Rhombohedral-Tetragonal (R-T) phase boundary close to room temperature, that facilities the polarization process of the system and exhibits a significantly high piezoelectric response with a d33 value as high as ∼400 pC/N, which is comparable to part soft PZTs. As a result, we believe that the general strategy and design principles described in this study open the possibility of obtaining (K,Na)NbO3-based lead-free ceramics with enhanced properties, expanding their application range.

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Section: Resultsmentioning

confidence: 97%

Lead-Free Piezoceramics: Revealing the Role of the Rhombohedral–Tetragonal Phase Coexistence in Enhancement of the Piezoelectric Properties

Rubio-Marcos

López-Juárez²,

Rojas-Hernández

et al. 2015

ACS Appl. Mater. Interfaces

130

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“…[3][4][5] Since Saito et al 6 have demonstrated that the KNN ceramics modified with Li, Ta, or Sb exhibit sufficient piezoelectric properties comparable to commercially available PZT-based ceramics, considerable interests have been devoted to improve the piezoelectric properties of KNN ceramics. [7][8][9][10][11] Doping is a mandatory solution to tailor the properties of KNN for specific applications. For Mn-doped KNN and KNN based ceramics, the improved electrical properties were observed.…”

Section: Introductionmentioning

confidence: 99%

Improved electrical properties for Mn-doped lead-free piezoelectric potassium sodium niobate ceramics

Wang

Ren

et al. 2015

AIP Advances

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The un-doped and doped lead-free piezoelectric potassium sodium niobate (K0.5Na0.5NbO3, KNN) ceramics with different amounts of Mn were prepared. The decreased dielectric losses and the improved electrical properties were observed in the Mn-doped KNN ceramics. However, the variation of electrical properties with the Mn contents was not continuously. The 0.5 mol.% Mn-doped KNN ceramic shows the highest dielectric loss and the worst electrical properties. The KNN ceramics doped with less than and more than 0.5 mol.% Mn all show improved electrical properties. The change of lattice position of Mn ions in KNN ceramics was the main reason. When the Mn content is less than 0.5 mol.%, the Mn ions occupied the cation vacancies in A-site. When the Mn content is higher than 0.5 mol.%, the Mn ions entered B-site of KNN perovskite structure and formed the defect complexes (MnNb″−VO⋅⋅) and (MnNb′−VO⋅⋅−MnNb′). They both led to a lower defect concentration. However, When the Mn content is up to 1.5 mol.%, the electrical properties of KNN ceramic became degraded because of the accumulation of Mn oxides at grain boundaries.

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“…4 One of the most promising alternatives is the (K 0.5 Na 0.5 )NbO 3 (KNN)-based solid solution system. [5][6][7][8][9][10][11] Various chemical modifiers, such as LiTaO 3 , 12,13 LiNbO 3 , [14][15][16] and LiSbO 3 , 17,18 have been employed to facilitate processing and optimize the piezoelectric behavior. The enhanced piezoelectricity in these compositionally modified KNN-based oxides is a result of reducing the temperature of the polymorphic phase boundary (PPB), where the tetragonal and orthorhombic phases coexist, from $210 C, for unmodified KNN, to near room temperature.…”

Section: Introductionmentioning

confidence: 99%

Microstructural origin for the piezoelectricity evolution in (K0.5Na0.5)NbO3-based lead-free ceramics

Guo

Zhang

Beckman

et al. 2013

Journal of Applied Physics

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Chemically modified (K0.5 Na 0.5)NbO3 compositions with finely tuned polymorphic phase boundaries (PPBs) have shown excellent piezoelectric properties. The evolution of the domain morphology and crystal structure under applied electric fields of a model material, 0.948(K0.5Na 0.5)NbO3-0.052LiSbO3, was directly visualized using in situ transmission electron microscopy. The in situ observations correlate extremely well with measurements of the electromechanical response on bulk samples. It is found that the origin of the excellentpiezoelectric performance in this lead-free composition is due to a tilted monoclinic phase that emerges from the PPB when poling fields greater than 14 kV/cm are applied. Disciplines Ceramic Materials | Materials Science and Engineering CommentsThe following article appeared in Journal of Applied Physics 114 (2013) Chemically modified (K 0.5 Na 0.5 )NbO 3 compositions with finely tuned polymorphic phase boundaries (PPBs) have shown excellent piezoelectric properties. The evolution of the domain morphology and crystal structure under applied electric fields of a model material, 0.948(K 0.5 Na 0.5 )NbO 3 -0.052LiSbO 3 , was directly visualized using in situ transmission electron microscopy. The in situ observations correlate extremely well with measurements of the electromechanical response on bulk samples. It is found that the origin of the excellent piezoelectric performance in this lead-free composition is due to a tilted monoclinic phase that emerges from the PPB when poling fields greater than 14 kV/cm are applied. V C 2013 AIP Publishing LLC.

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A monoclinic-tetragonal ferroelectric phase transition in lead-free (K0.5Na0.5)NbO3-x%LiNbO3 solid solution

Cited by 55 publications

References 62 publications

Lead-Free Piezoceramics: Revealing the Role of the Rhombohedral–Tetragonal Phase Coexistence in Enhancement of the Piezoelectric Properties

Lead-Free Piezoceramics: Revealing the Role of the Rhombohedral–Tetragonal Phase Coexistence in Enhancement of the Piezoelectric Properties

Improved electrical properties for Mn-doped lead-free piezoelectric potassium sodium niobate ceramics

Microstructural origin for the piezoelectricity evolution in (K0.5Na0.5)NbO3-based lead-free ceramics

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