Laser ablated lead free (Na, K) NbO3 thin films with excess alkali-content

Shamim, Kashif; Sharma, Seema; Choudhary, R. J.

doi:10.1007/s10854-017-6962-y

Cited by 6 publications

(6 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This phenomenon results in decreasing dielectric values with increasing frequencies. 37 Figure 6(b) shows the variation of dielectric loss with frequency at RT, which appears to be decreasing monotonically with increasing frequency. The relative high dielectric loss for the sample sintered at 1050 C is attributed to the presence of minor secondary phase, resulting due to the loss of cations/alkali species content in the compounds.…”

Section: Resultsmentioning

confidence: 99%

Dielectric relaxation and modulus spectroscopy analysis of (Na0.47 K0.47 Li0.06) NbO₃ ceramics

et al. 2017

Self Cite

View full text Add to dashboard Cite

We have investigated the structure, dielectric and electrical properties of lead-free polycrystalline (Na 0:47 K 0:47 Li 0:06 ) NbO 3 ceramics as a function of temperature and frequency in order to understand the intrinsic contribution of grain/bulk and grain boundary effects toward the dielectric response as well as the electrical conduction mechanism in the samples fabricated by microwave sintering method. X-ray diffraction analysis exhibits perovskite structure with orthorhombic symmetry, which is well supported by the Raman spectroscopic analysis. A minor secondary impurity phase of tungsten bronze structure was observed for samples sintered at 1050 C, which gets weaker for samples sintered at 1150 C. Dielectric permittivity was enhanced by 50%, although there was a reduction in the dielectric loss by about 50% at Curie temperature (450 C) for samples sintered at 1150 C. Complex impedance spectroscopic analysis indicated non-Debye-type dielectric relaxation present in the samples, and this phenomenon followed thermally activated process related to hopping mechanism. Nyquist plot showed the negative temperature coefficient of resistance, characteristic of the samples.

show abstract

Section: Resultsmentioning

confidence: 99%

Dielectric relaxation and modulus spectroscopy analysis of (Na0.47 K0.47 Li0.06) NbO₃ ceramics

et al. 2017

Self Cite

View full text Add to dashboard Cite

show abstract

“…With further increase in the frequency, the direction of flow is precluded inside the dielectric medium, accumulation of charges occurs now at the grain boundaries and as a result, there is an overall decrease in the dielectric constant value at higher frequencies. 33 To further explore the ferroelectric behavior of the samples, polarization-electric field hysteresis measurements were carried out for different compositions at 10 Hz and at room temperature as shown in Fig. 6.…”

Section: Resultsmentioning

confidence: 99%

“…1 Among the available lead-free materials, (Na 1Àx K x ) NbO 3 (KNN) has been widely studied due to excellent electromechanical coupling, high Curie temperature and piezoelectric properties. 2 In 2004, Saito et al 3 studied the textured (K, Na) NbO 3 -LiTaO 3 -LiSbO 3 system by reactive templated grain growth (RTGG) method and were successful in achieving excellent piezoelectric coefficient value (d 33 $ 416 pC/N). It is believed that this high piezoelectric property could be achieved because of the morphotropic phase boundary (MPB) among rhombohedral, tetragonal or monoclinic phases.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of structure, dielectric and electrical properties of (Li/Ta/Sb) modified (Na, K) NbO₃ lead-free ceramics with excess Na concentration

2017

Self Cite

View full text Add to dashboard Cite

Polycrystalline perovskite structured (Li 0:04 (Na 0:54þx K 0:46 ) 0:96 (Nb 0:81 Ta 0:15 Sb 0:04 Þ O 3 ceramics with x ¼ 0:00, 0.005 and 0.01 mole excess Na concentration were prepared by solid state sintering method. The present study relates the role of excess Na addition with the stoichiometry, density, structure, dielectric and ferroelectric properties of the samples. X-ray diffraction (XRD) pattern exhibits single phase orthorhombic structure. The characteristic Raman modes were observed due to translational modes of cations and vibrational modes of NbO 6 octahedra and no structural phase transition were observed. This confirms the formation of single phase perovskite structure and is consistent with XRD results. The dielectric permittivity increases about two times, while dielectric loss decreases by four times for x ¼ 0:01 composition. The electrical measurements carried by Complex Impedance spectroscopic analysis suggest negative temperature coefficient of resistance (NTCR) behavior.

show abstract

“…Additionally, optimal amounts of excess K and Na were found to be 20 mol% to form high‐quality single‐phase Li + , Ta 5+ , and Sb 5+ co‐doped KNN‐based films . The addition of excess Na element can lead to the increase in grain size and the improvement of leakage current …”

Section: Synthetic Techniquesmentioning

confidence: 99%

Potassium‐Sodium‐Niobate‐Based Thin Films: Lead Free for Micro‐Piezoelectrics

et al. 2019

View full text Add to dashboard Cite

Extensive research and great progress of (K,Na)NbO 3 (KNN)-based lead-free piezoelectric films have been driven by the current legislation and the requirement for sustainable development of society and environment in the applications of microelectromechanical systems. A comprehensive discussion of the recent achievement in KNN-based films is presented herein. First, the available synthetic techniques, chemical modification, the ferroelectric and piezoelectric properties of KNN-based films are reviewed, followed by an introduction of the crystal structures and electrical properties of KNN-based epitaxial films in comparison with the bulk ceramics. Finally, the applications of KNN-based films for the sensors, the energy harvesters, and energy storage devices are addressed, and current challenges and prospects for future work are discussed.

show abstract

Laser ablated lead free (Na, K) NbO3 thin films with excess alkali-content

Cited by 6 publications

References 26 publications

Dielectric relaxation and modulus spectroscopy analysis of (Na0.47 K0.47 Li0.06) NbO₃ ceramics

Dielectric relaxation and modulus spectroscopy analysis of (Na0.47 K0.47 Li0.06) NbO₃ ceramics

Evaluation of structure, dielectric and electrical properties of (Li/Ta/Sb) modified (Na, K) NbO₃ lead-free ceramics with excess Na concentration

Potassium‐Sodium‐Niobate‐Based Thin Films: Lead Free for Micro‐Piezoelectrics

Contact Info

Product

Resources

About

Laser ablated lead free (Na, K) NbO3 thin films with excess alkali-content

Cited by 6 publications

References 26 publications

Dielectric relaxation and modulus spectroscopy analysis of (Na0.47 K0.47 Li0.06) NbO3 ceramics

Dielectric relaxation and modulus spectroscopy analysis of (Na0.47 K0.47 Li0.06) NbO3 ceramics

Evaluation of structure, dielectric and electrical properties of (Li/Ta/Sb) modified (Na, K) NbO3 lead-free ceramics with excess Na concentration

Potassium‐Sodium‐Niobate‐Based Thin Films: Lead Free for Micro‐Piezoelectrics

Contact Info

Product

Resources

About

Dielectric relaxation and modulus spectroscopy analysis of (Na0.47 K0.47 Li0.06) NbO₃ ceramics

Dielectric relaxation and modulus spectroscopy analysis of (Na0.47 K0.47 Li0.06) NbO₃ ceramics

Evaluation of structure, dielectric and electrical properties of (Li/Ta/Sb) modified (Na, K) NbO₃ lead-free ceramics with excess Na concentration