Characterisation of Pb(Mn1/3Nb2/3)O3 ceramics by SEM, XRD, XPS and dielectric permittivity tests

Molak, A.; Talik, E.; Kruczek, M.; Paluch, Marian; Ratuszna, A.; Ujma, Z.

doi:10.1016/j.mseb.2005.11.011

Cited by 54 publications

(25 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This frequency independent region increases with increase in temperature and obeys the phenomenological law (Jonscher's universal power law): σ ac =σ dc +Aω n [38], where  dc is the frequency ) independent term giving dc conductivity, the exponent n (which generally varies between 0 to 1) represents the degree of interaction between mobile ions with the lattices around them, and A determines the strength of polarizability. The parameter n is frequency independent but temperature and material dependent [53]. The continuous solid line (in Fig.…”

Section: Ac Conductivitymentioning

confidence: 99%

Dielectric and electrical properties of Na2Pb2La2W2Ti4Ta4O30 electroceramics

et al. 2012

View full text Add to dashboard Cite

Abstract:The polycrystalline sample of complex tungsten-bronze type compound (Na 2 Pb 2 La 2 W 2 Ti 4 Ta 4 O 30 ) was prepared by a high-temperature solid-state reaction technique. Room temperature preliminary structural study using X-ray diffraction (XRD) data exhibits the formation of a single-phase new compound. The SEM micrograph of the compound exhibits non uniform rectangular grains distributed throughout the sample surface. Detailed studies of dielectric parameters (ε r , tan δ) as a function of temperature and frequency, and P-E hysteresis (spontaneous polarization) confirmed the existence of ferroelectricity in the material. Complex impedance spectroscopy analysis, carried out as a function of frequency at different temperatures, established a correlation between the microstructure and electrical properties of the material. The electrical relaxation process occurring in the material is temperature dependent. The activation energy found from the Arrhenius plot that the conduction process in the material is of mixed type. The nature of frequency dependence of ac conductivity suggests that the material obeys Jonscher's universal power law.

show abstract

Section: Ac Conductivitymentioning

confidence: 99%

Dielectric and electrical properties of Na2Pb2La2W2Ti4Ta4O30 electroceramics

et al. 2012

View full text Add to dashboard Cite

show abstract

“…The difference in valence state of vanadium (i.e., V 5+ -V 4+ ) at higher temperatures results in the oxygen ion vacancies, which may also contribute to the conduction process. Therefore, the conductivity may be of mixed-type (i.e., ionic-polaronic and space charge) [27,28]. Fig.…”

Section: Conductivity Studymentioning

confidence: 99%

Structural, dielectric, electrical and piezoelectric properties of Ba4SrRTi3V7O30 (R=Sm, Dy) ceramics

Sahoo¹,

Panigrahi²,

Patri³

et al. 2008

Open Physics

View full text Add to dashboard Cite

Abstract:Polycrystalline samples of Ba 4 SrRTi 3 V 7 O 30 (R=Sm and Dy), members of the tungsten-bronze family, were prepared using a high-temperature, solid-state reaction technique and studied their electrical properties (using complex impedance spectroscopy) in a wide range of temperature (31-500 • C) and frequency (1 kHz -1 MHz). Preliminary structural (XRD) analyses of these compounds show the formation of single-phase, orthorhombic structures at room temperature. The scanning electron micrographs (SEM) provided information on the quality of the samples and uniform distribution of grains over the entire surface of the samples. Detailed studies of the dielectric properties suggest that they have undergone ferroelectric-paraelectric phase transition well above the room temperatures (i.e., 432 and 355 • C for R= Sm and Dy, respectively, at frequency 100 kHz). Measurements of electrical conductivity (ac and dc) as a function of temperature suggest that the compounds have semiconducting properties much above the room temperature, with negative temperature coefficient of resistance (NTCR) behavior. The existence of ferroelectricity in these compounds was confirmed from a polarization study.

show abstract

“…Therefore, the role of the mixed ionic-polaronic conductivity is realized, since it includes the charge carriers generated from the vacancies. In addition, a collective motion of oxygen ions and vacancies play important role in the conduction process [36,37].…”

Section: Resultsmentioning

confidence: 99%

Dielectric Relaxation in Complex Perovskite Oxide Sr(Gd0.5Nb0.5)O3

Kumar¹,

Sharma²,

Singh³

et al. 2012

MSA

View full text Add to dashboard Cite

The complex perovskite oxide a strontium gadolinium niobate (SGN) synthesized by solid-state reaction technique has single phase with tetragonal structure. X-ray diffraction (XRD) technique and scanning electron microscopy (SEM) were used to study the structural and microstructural properties of the ceramics, respectively. The XRD patterns of SGN at room temperature show a tetragonal structure. Studies of the dielectric constant and dielectric loss of compound as a function of frequency (50 Hz to 1 MHz) at room temperature, and as a function of temperature (60˚C to 420˚C) indicate polydispersive nature of the material. The logarithmic angular frequency dependence of the loss peak is found to obey the Arrhenius law with activation energy ~0.18 eV. The small value of activation energy of the compound (~0.18 eV) can be explained by mixed ionic-polaronic conductivity mechanism. The grain size of the pellet sample was found to be 1.92 µm. The frequency-dependant electrical data are analyzed in the framework of conductivity and electric modulus formalisms. The complex plane impedance plot shows the grain boundary contribution for higher value of dielectric constant in the law frequency region.

show abstract

Characterisation of Pb(Mn1/3Nb2/3)O3 ceramics by SEM, XRD, XPS and dielectric permittivity tests

Cited by 54 publications

References 36 publications

Dielectric and electrical properties of Na2Pb2La2W2Ti4Ta4O30 electroceramics

Dielectric and electrical properties of Na2Pb2La2W2Ti4Ta4O30 electroceramics

Structural, dielectric, electrical and piezoelectric properties of Ba4SrRTi3V7O30 (R=Sm, Dy) ceramics

Dielectric Relaxation in Complex Perovskite Oxide Sr(Gd<sub>0.5</sub>Nb<sub>0.5</sub>)O<sub>3</sub>

Contact Info

Product

Resources

About

Characterisation of Pb(Mn1/3Nb2/3)O3 ceramics by SEM, XRD, XPS and dielectric permittivity tests

Cited by 54 publications

References 36 publications

Dielectric and electrical properties of Na2Pb2La2W2Ti4Ta4O30 electroceramics

Dielectric and electrical properties of Na2Pb2La2W2Ti4Ta4O30 electroceramics

Structural, dielectric, electrical and piezoelectric properties of Ba4SrRTi3V7O30 (R=Sm, Dy) ceramics

Dielectric Relaxation in Complex Perovskite Oxide Sr(Gd&lt;sub&gt;0.5&lt;/sub&gt;Nb&lt;sub&gt;0.5&lt;/sub&gt;)O&lt;sub&gt;3&lt;/sub&gt;

Contact Info

Product

Resources

About

Dielectric Relaxation in Complex Perovskite Oxide Sr(Gd<sub>0.5</sub>Nb<sub>0.5</sub>)O<sub>3</sub>