Dielectric and piezoelectric properties of the KNN ceramic compound doped with Li, La and Ta

Fuentes, J.; Durruthy-Rodríguez, M. D.; Hmŏk, H’Linh; Raymond, O.; Heiras, J.; Cruz, M. P.; Siqueiros, J. M.

doi:10.1007/s00339-014-8783-7

Cited by 28 publications

(8 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A very crucial consequence of porosity is that it causes severe changes to properties, particularly the dielectric and piezoelectric properties. 15 Good agreement between theoretical density, calculated from XRD data, and experimental density has been obtained, as shown in Fig. 1.…”

Section: Sample Densitysupporting

confidence: 60%

Dielectric and piezoelectric perfomance of lead-free ceramics of boron sodium gadolinate niobate at morphotropic phase boundary

Kunnath

Philip

2020

J. Adv. Dielect.

View full text Add to dashboard Cite

New lead-free piezoceramic nanocomposites of Boron Sodium Gadolinium Niobate (BNGN), with general formula (1[Formula: see text]B[Formula: see text]Na[Formula: see text]GdO[Formula: see text][Formula: see text]B[Formula: see text]Na[Formula: see text]NbO3, exhibiting a Morphotropic Phase Boundary (MPB), have been synthesized following hydrothermal method followed by solid state sintering. The occurrence of MPB at the composition with [Formula: see text], at which rhombohedral and monoclinic phases are found to coexist, has been confirmed using powder XRD. This accounts for the occurrence of large remnant polarization when the sintered ceramic pellets are subjected to electric poling at 2KV/mm. Uniform microstructure of various compositions is confirmed by SEM imaging. Dielectric and piezoelectric properties of the samples are found to be comparable to those of commercial grade PZT. At the MPB, the d[Formula: see text] coefficient is found to be 556 pC/N, which is close to that of commercial grade PZT, which makes BNGN a promising material to substitute lead containing PZT in the near future.

show abstract

Section: Sample Densitysupporting

confidence: 60%

Dielectric and piezoelectric perfomance of lead-free ceramics of boron sodium gadolinate niobate at morphotropic phase boundary

Kunnath

Philip

2020

J. Adv. Dielect.

View full text Add to dashboard Cite

show abstract

“…In the KNN‐based ceramics, K + (1.64 Å) and Na + cations (1.39 Å) occupy the A site, while Nb 5+ cations (0.64 Å) occupy the B site. According to the principles of crystal chemistry, the radius of La 3+ (1.36 Å) is more close to A‐site cations than that of B‐site cations, then La 3+ cations (1.36 Å) are suggested to introduce into A site . For Bi 3+ cations doping, the occupying situation becomes complex because Bi elements can enter into both A and B sites in the form of Bi 3+ (1.03 Å) and Bi 5+ (0.74 Å), respectively.…”

Section: Resultsmentioning

confidence: 99%

Excellent Transmittance Induced Phase Transition and Grain Size Modulation in Lead‐Free (1–x)(K_0.5Na_0.5)NbO₃–xLaBiO₃ Ceramics

et al. 2016

View full text Add to dashboard Cite

A novel lead-free excellent transmittance electro-optic ceramics (1-x)(K 0.5 Na 0.5 )NbO 3 -xLaBiO 3 (KNN-LB, x = 0.000, 0.005, 0.010, 0.015, 0.020, 0.025, 0.040, 0.060) were fabricated by traditional pressureless ceramics processing procedure. The effects of LaBiO 3 dopant concentration x on the microstructure, phase transition, optical property, and electrical properties were studied systematically. The X-ray diffraction results indicated that the KNN-LB ceramics with x ≥ 0.025 have the pseudocubic phase. The morphology, density, and microstructure of the KNN-LB ceramics were characterized by scanning electronic microscopy and optical microscopy. In particular, the KNN-LB ceramics (0.05 mm thickness) with x = 0.025 exhibited the highest transmittance of 74.00% in the visible spectrum comparable to the 72.00% transmittance of the lead lanthanum zirconate titanate (PLZT 9/65/35 of 0.127 mm thickness). In addition, the related mechanism of transparency variation induced by phase transition and grain size modulation were discussed thoroughly. Finally, the dielectric and ferroelectric properties of as-prepared KNN-LB ceramics were also investigated to further clarify the relationship between transparency and relaxor behavior.

show abstract

“…This structure is also studied for optical properties [26] and catalytic activities [27]. In the KNN system, even though the TTB phase has been found as a secondary phase in bulk perovskite [28][29][30], the pure phase was neither reported nor properly characterized. Some previous works on a modified K x Na 1-x NbO 3 perovskite ceramic have reported that the TTB phase, as a secondary phase, could explain the increase of the piezoelectric properties [29].…”

Section: Introductionmentioning

confidence: 99%

Tetragonal tungsten bronze phase thin films in the K–Na–Nb–O system: Pulsed laser deposition, structural and dielectric characterizations

Aspe

Demange

Waroquet

et al. 2020

Journal of Alloys and Compounds

View full text Add to dashboard Cite

Pulsed laser deposition parameters have been determined to synthesize pure Tetragonal Tungsten Bronze (TTB) phase thin films in the (K , Na)-Nb-O system (KNN). In relation to the high volatility of alkaline elements, it was found that the target composition and the targetsubstrate distance are of first importance. The TTB phase was identified by X-ray and electron diffraction and the surface microstructure consisting mainly of nanorods supports the formation of hallmark of the TTB phase. Poly-oriented nanorods have been obtained on both C-plane sapphire and (111)Pt/TiO 2 /SiO 2 /(001)Si substrates whereas horizontal nanorods oriented along the (hk0) planes have been grown on (100) and (110) SrTiO 3. All the nanorods are parallel together when grown on (110) SrTiO 3 and they present two in-plane orientations rotated of 90° from each other on (100) SrTiO 3. Dielectric characteristics (dielectric permittivity ε r , and loss tangent tanδ) have been measured at low (1 kHz-1 MHz) and high (1 GHz-40 GHz) frequencies, on films deposited on Pt coated silicon and sapphire, respectively. A value of ε r = 200 at 1 kHz with tanδ = 0.015 were measured in a parallel plate capacitor configuration, whereas ε r = 130 and tanδ = 0.20 at 10 GHz were retrieved from transmission lines printed on the KNN TTB thin film grown on C-plane sapphire. Raman investigations of the TTB films were performed in the temperature range 77-873 K, confirming the TTB phase formation and the absence of structural transition. Piezoelectric Force Microscopy measurements evidenced a piezoelectric signal although no switching could be performed. However the dielectric measurements, complicated by high leakage currents when a DC voltage was applied, did not evidence any proof of ferroelectricity for the undoped KNN TTB films whereas results reported on other niobates (A,A') 0.6 Nb 10 O 30 (with A: K, Na and A': Sr, Ba, Ca) have shown Curie temperatures, lying between 156°C and 560°C, separating the paraelectric phase (space group: P4/mbm N°127) and the ferroelectric one (space group: P4bm N°100).

show abstract

Dielectric and piezoelectric properties of the KNN ceramic compound doped with Li, La and Ta

Cited by 28 publications

References 22 publications

Dielectric and piezoelectric perfomance of lead-free ceramics of boron sodium gadolinate niobate at morphotropic phase boundary

Dielectric and piezoelectric perfomance of lead-free ceramics of boron sodium gadolinate niobate at morphotropic phase boundary

Excellent Transmittance Induced Phase Transition and Grain Size Modulation in Lead‐Free (1–x)(K_0.5Na_0.5)NbO₃–xLaBiO₃ Ceramics

Tetragonal tungsten bronze phase thin films in the K–Na–Nb–O system: Pulsed laser deposition, structural and dielectric characterizations

Contact Info

Product

Resources

About

Dielectric and piezoelectric properties of the KNN ceramic compound doped with Li, La and Ta

Cited by 28 publications

References 22 publications

Dielectric and piezoelectric perfomance of lead-free ceramics of boron sodium gadolinate niobate at morphotropic phase boundary

Dielectric and piezoelectric perfomance of lead-free ceramics of boron sodium gadolinate niobate at morphotropic phase boundary

Excellent Transmittance Induced Phase Transition and Grain Size Modulation in Lead‐Free (1–x)(K0.5Na0.5)NbO3–xLaBiO3 Ceramics

Tetragonal tungsten bronze phase thin films in the K–Na–Nb–O system: Pulsed laser deposition, structural and dielectric characterizations

Contact Info

Product

Resources

About

Excellent Transmittance Induced Phase Transition and Grain Size Modulation in Lead‐Free (1–x)(K_0.5Na_0.5)NbO₃–xLaBiO₃ Ceramics