Influence of B-site compositional homogeneity on properties of (K0.44Na0.52Li0.04)(Nb0.86Ta0.10Sb0.04)O3-based piezoelectric ceramics

Ramajo, Leandro Alfredo; Castro, Miriam Susana; Campo, Adolfo del; Fernández, J.F.; Rubio-Marcos, Fernando

doi:10.1016/j.jeurceramsoc.2014.02.002

Cited by 17 publications

(7 citation statements)

References 24 publications

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“…As compared with the KNLN 1– x S x -BZ ceramics without Sb 5+ we notice that the ceramics with Sb 5+ have a lower T C , which shows a linear relationship with the Sb 5+ content. This phenomenon is consistent with previously reported results in KNN with the addition of other B-site doping. ,,− Moreover, the dielectric constant value at the T c increases with the Sb 5+ doping, reaching a maximum at x = 0.07. Noteworthy, the dielectric constant at room temperature increases with the doping amount, while the dielectric losses remain low ( see Table S1, Supporting Information).…”

Section: Results and Discussionsupporting

confidence: 93%

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

123

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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: Results and Discussionsupporting

confidence: 93%

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

123

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“…33 Previous studies have shown that doping with Mo 6+ , Ni 2+ , or Mn 2+ increases T O-T in KNN. 32,34,35 The observed shifts in the T O-T indicate that the W 6+ incorporation into the perovskite structure promotes the stabilization of the orthorhombic symmetry at room temperature, as can be observed by X-ray diffraction, due to the secondary phase formation which partially retains the alkaline elements (Li, Na, K). Here we will also mainly focus on the variations of the T C values as a function of W 6+ , Fig.…”

Section: Influence Of the Structural And Microstructural Changes On T...mentioning

confidence: 59%

“…This phenomenon is consistent with the previously reported results in KNN with the addition of another doping at the B-site. [34][35][36][37] In addition, some differences in the T O-T and T C peak shapes were also observed, as shown in Fig. 4(c) and (d).…”

Section: Influence Of the Structural And Microstructural Changes On T...mentioning

confidence: 75%

Revealing the role of cationic displacement in potassium–sodium niobate lead-free piezoceramics by adding W⁶⁺ ions

et al. 2015

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The effect of the structural modifications induced by the replacement of the B sites with W 6+ ions in tetragonal symmetry (T) and an orthorhombic symmetry (O) onto the perovskite structure, which is tuned by varying the doping level. In addition, this polymorphic behaviour is accompanied by the appearance of a secondary phase, which can be detected through XRD and Raman results. A correlation between the presence of both structural features and the W 6+ content has been evaluated, and therefore this lead free system reveals a transition from a normal ferroelectric to a 'relaxor-like' ferroelectric due to the cation disorder in the perovskite-structure in doped samples. A large diffusivity value (γ) has been attained when the x value reached 0.05 owing to the involved O-T polymorphic phase, as well as by the appearance of a secondary phase. The experimental proofs make clear that the role of the secondary phase is to capture the alkali ions of (KNa)NbO 3 -based system, provoking a cation disorder in the perovskite-structure matrix. The significance of this work lies in evaluating whether such a material can benefit the understanding of (KNa)NbO 3 -based ceramics and the expanding of their applications range.

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“…Hreščak et al reported that even the choice of the Nb 2 O 5 precursor (orthorhombic or monoclinic polymorph) can influence the homogeneity of the KNN solid solution [8]. This issue is particularly pronounced in complex solid solutions, where in pursuit of a higher piezoelectric coefficient d 33 , compositions on phase boundaries are constructed by introducing additional elements as substituents on A-and B-sites of the KNN perovskite lattice [9][10][11]. In the case of the Li-and Ta-modified KNN (KNLNT) solid solution, it was found that the inhomogeneous distribution of the A-site (K, Na) and B site (Nb, Ta) cations is correlated and cannot be efficiently avoided by prolonged high-temperature annealing or intensive attrition milling [12].…”

Section: Introductionmentioning

confidence: 99%

Mechanochemically-Assisted Synthesis of Lead-Free Piezoelectric CaZrO3-Modified (K,Na,Li)(Nb,Ta)O3-Solid Solution

et al. 2018

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Lead-free piezoelectric 0.95(Na0.49K0.49Li0.02)(Nb0.8Ta0.2)O3–0.05CaZrO3 with 2 wt % MnO2 addition was prepared using mechanochemically-assisted solid-state synthesis. Upon mechanochemical activation of the mixture of reagents partial amorphization occurs which contributes to a significantly lower temperature of completion of the solid-state reaction, ~600 °C as opposed to ~700 °C for the conventional solid-state synthesis as determined by thermal analysis. The ceramic specimens prepared by the mechanochemically-assisted route exhibit improved compositional homogeneity and slightly enhanced piezoelectric properties, achieved in a considerably shorter processing time compared to the conventional solid-state synthesis route, which was studied as a reference.

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Influence of B-site compositional homogeneity on properties of (K0.44Na0.52Li0.04)(Nb0.86Ta0.10Sb0.04)O3-based piezoelectric ceramics

Cited by 17 publications

References 24 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

Revealing the role of cationic displacement in potassium–sodium niobate lead-free piezoceramics by adding W⁶⁺ ions

Mechanochemically-Assisted Synthesis of Lead-Free Piezoelectric CaZrO3-Modified (K,Na,Li)(Nb,Ta)O3-Solid Solution

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Influence of B-site compositional homogeneity on properties of (K0.44Na0.52Li0.04)(Nb0.86Ta0.10Sb0.04)O3-based piezoelectric ceramics

Cited by 17 publications

References 24 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

Revealing the role of cationic displacement in potassium–sodium niobate lead-free piezoceramics by adding W6+ ions

Mechanochemically-Assisted Synthesis of Lead-Free Piezoelectric CaZrO3-Modified (K,Na,Li)(Nb,Ta)O3-Solid Solution

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Revealing the role of cationic displacement in potassium–sodium niobate lead-free piezoceramics by adding W⁶⁺ ions