Complex permittivity measurements of ferroelectrics employing composite dielectric resonator technique

Křupka, J.; Zychowicz, T.; Bovtun, V.; Veljko, S.

doi:10.1109/tuffc.2006.120

Cited by 21 publications

(18 citation statements)

References 5 publications

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“…The TE 0n1 composite dielectric resonator method 8 and network analyzer Agilent E8364B was used for microwave measurements at 8.8 GHz in 100 -350 K temperature interval. The cooling rate was 2 K/min.…”

Section: Introductionmentioning

confidence: 99%

Quantum paraelectric behavior of pyrochlorePb1.83Mg0.29Nb1.71O6.39

Kamba¹,

Денисов²,

Veljko³

et al. 2007

Phys. Rev. B

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Pb1.83Mg0.29Nb1.71O6.39 (PMN) crystallizing in a cubic pyrochlore structure exhibits, as the first dielectrics with pyrochlore structure, typical feature of quantum paraelectrics -its permittivity continuously increases on cooling and levels off below ∼ 30 K without any signature of a structural phase transition. Broad-band dielectric spectra do not show any dielectric dispersion in the real part of permittivity up to 8.8 GHz. THz and infrared spectra reveal a soft polar optic mode which is responsible for the temperature dependence of the permittivity. The leveling-off of the permittivity at low temperatures obeys the Barrett formula and the fitted vibrational zero-point energy 1 2 kBT1 corresponds to the measured soft mode frequency. The number of observed infrared phonons exceeds that predicted from the factor-group analysis which indicates that the structure is at least locally non-cubic.

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Section: Introductionmentioning

confidence: 99%

Quantum paraelectric behavior of pyrochlorePb1.83Mg0.29Nb1.71O6.39

Kamba¹,

Денисов²,

Veljko³

et al. 2007

Phys. Rev. B

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“…So, one can expect a low sensitivity to the ferroelectric film properties. The situation is just opposite to the measurements of bulk ferroelectrics using composite DR [4,6], where the main problem is to reduce the influence of the highloss ferroelectric part and avoid the enormous dropping down of the system quality factor Q 0 or even suppressing of the resonance. Second, there are no free-standing ferroelectric thin films.…”

Section: Introductionmentioning

confidence: 92%

Microwave Characterization of Thin Ferroelectric Films Without Electrodes by Composite Dielectric Resonator

Bovtun

Veljko

Axelsson

et al. 2008

Integrated Ferroelectrics

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Possibility of microwave characterization of the thin ferroelectric films without electrodes by a composite TE 01δ dielectric resonator was checked experimentally. Ferroelectric films PbZr 0.52 Ti 0.48 O 3 , Ba 0.1 Sr 0.9 TiO 3 and BaTiO 3 deposited on the sapphire substrates were measured at ∼5.8 GHz or ∼8.2 GHz in the temperature range 30 K-380 K. TE 01δ composite dielectric resonator was demonstrated to be sufficiently sensitive to the ferroelectric films and can be used for their characterization. Moreover, losses of the resonator are mainly defined by the ferroelectric film losses. Temperature dependences of the films dielectric permittivity and tan δ were detected correctly.

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“…The problem is additionally enhanced by the very high dielectric permittivity of ferroelectrics. Recently, two methods based on the composite dielectric resonator (DR) were developed which allow the measurements of high-loss, highpermittivity bulk ferroelectric materials: split-post DR [4] and composite DR with TEoI1 mode [4,5]. Influence of the ferroelectric part on the resonance was reduced 1) by using of small volume samples (thin plates, h < 0.3 mm or rods, D < 1 mm) and 2) by using of the resonance modes with electric field strength lines which are parallel in the basic and ferroelectric parts.…”

mentioning

confidence: 99%

“…1. Schematic diagram of the TEOnI composite dielectric resonator [5]Rigorous equations have been derived that allowed to find relationship between measured resonance frequency and Q-factor and the complex dielectric permittivity [5]. It has been shown that ferroelectric samples can be measured employing either the TEO,I or the TE021 mode, depending on the dielectric permittivity and loss values (Fig.…”

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confidence: 99%

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Microwave Characterization of Bulk Ferroelectrics and Relaxors using Composite Dielectric Resonator

Veljko

Bovtun

Křupka

et al. 2007

2007 International Kharkiv Symposium Physics and Engrg. Of Millimeter and Sub-Millimeter Waves (MSMW)

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3NTUU "Kyiv Polytechnic Institute Prospect Peremogy 3 7, 03056 Kyiv, Ukraine Ferroelectric and relaxor materials are characterized by the very high dielectric permittivity and losses in the microwave (MW) range, especially near the phase transition or diffuse permittivity maximum in the case of relaxors [1][2][3]. It makes MW measurements (300 MHz -300 GHz) of the ferroelectrics and relaxors extremely difficult. Impedance measurements using coaxial technique cover the lower part of MW ranige (1 MHz -3 GHz), while THz time domain spectroscopy (or other quasi-optic methods) covers the upper part (100 GIIz -3 THz). In the middle part of MW range, impedance measurements of the transmission line section containing the dielectric sample (usually the rectangular waveguide section) and resonance methods using resonance systems of different kind (cavity resonator, dielectric resonator, waveguide resonator, microstrip line resonator, etc.) with an inserted sample can be used. All these methods should be modified to account for the high permittivity and losses of the measured ferroelectric sample.The high-loss sample could not create the resonance element itself, but should be a part of the resonance system. The main problem in this approach is to reduce the influence of the high-loss part and avoid the enormous dropping down of the system quality factor Q or even suppressing of the resonance. The problem is additionally enhanced by the very high dielectric permittivity of ferroelectrics. Recently, two methods based on the composite dielectric resonator (DR) were developed which allow the measurements of high-loss, highpermittivity bulk ferroelectric materials: split-post DR [4] and composite DR with TEoI1 mode [4,5]. Influence of the ferroelectric part on the resonance was reduced 1) by using of small volume samples (thin plates, h < 0.3 mm or rods, D < 1 mm) and 2) by using of the resonance modes with electric field strength lines which are parallel in the basic and ferroelectric parts. In the last case, electric field strength lines do not cross the interface between basic and ferroelectric parts. This allows to avoid the dramatic influence of the interface inhomogeneity, possible air gaps between the basic and ferroelectric parts, etc. In the case of TEOIn composite DR, additional reducing of the ferroelectric part influence was achieved by inserting of the ferroelectric rod in the minimum of electric field in the DR center.The method based on composite cylindrical TEonB mode dielectric resonator (Fig. 1) was developed and set up for the complex permittivity measurements of bulk rod-shaped samples at frequency of -8.8 GHz [5]. salliple ,17 Jeflonl sleeve mnet.-l cav-itv-^+, , dielecti-ic resonflt4rti 1 l 13 14 Fig. 1. Schematic diagram of the TEOnI composite dielectric resonator [5]Rigorous equations have been derived that allowed to find relationship between measured resonance frequency and Q-factor and the complex dielectric permittivity [5]. It has been shown that ferroelectric samples can be measured employing ei...

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Complex permittivity measurements of ferroelectrics employing composite dielectric resonator technique

Cited by 21 publications

References 5 publications

Quantum paraelectric behavior of pyrochlorePb1.83Mg0.29Nb1.71O6.39

Quantum paraelectric behavior of pyrochlorePb1.83Mg0.29Nb1.71O6.39

Microwave Characterization of Thin Ferroelectric Films Without Electrodes by Composite Dielectric Resonator

Microwave Characterization of Bulk Ferroelectrics and Relaxors using Composite Dielectric Resonator

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