132 research outputs found
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Measurement and calculation of PZT thin film longitudinal piezoelectric coefficients.
The ferroelectric and piezoelectric properties of 2000 {angstrom} thick chemical solution deposited Pb(Zr{sub x}Ti{sub 1{minus}x})O{sub 3} (PZT) thin films were investigated. Several Zr/Ti ratios were studied: 30/70, 50/50 and 65/35, which correspond to tetragonal, near-morphotropic, and rhombohedral symmetries. In all samples, a {l_brace}111{r_brace}-texture is predominant. Longitudinal piezoelectric coefficients and their dc field dependence were measured using the contact AFM method. The expected trend of a maximum piezoelectric coefficient at or near to the MPB was not observed. The composition dependence was small, with the maximum d{sub 33} occurring in the tetragonal material. To explain the results, crystallographic texture and film thickness effects are suggested. Using a modified phenomenological approach, derived electrostrictive coefficients, and experimental data, d{sub 33} values were calculated. Qualitative agreement was observed between the measured and calculated coefficients. Justifications of modifications to the calculations are discussed
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Lead zirconate titanate on base metal foils: An approach for embedded high-K passive components
An approach for embedding high-K dielectric thin films into polymer packages has been developed. Pb{sub 0.85}La{sub 0.15}(Zr{sub 0.52}Ti{sub 0.48}){sub 0.96}O{sub 3} thin films were prepared by chemical solution deposition on 50 {micro}m thick Ni-coated Cu foils. Sputter deposited Ni top electrodes completed the all base-metal capacitor stack. After high temperature N{sub 2} crystallization anneals, the PLZT composition showed reduction resistance while the base-metal foils remained flexible. Capacitance density and Loss tangent values range between 300 and 400 nF/cm{sup 2} and 0.01 and 0.02 from 1 to 1,000 kHz respectively. These properties represent a 2 to 3 order of magnitude improvement over available embedded capacitor technologies for polymeric packages
Π Π΅Π°ΠΊΡΠΈΡ ΡΠΎΡΠΎΡΠΎΠΆΠ΄Π΅Π½ΠΈΡ ΠΌΠ΅Π·ΠΎΠ½ΠΎΠ² Π½Π° Π½ΡΠΊΠ»ΠΎΠ½Π°Ρ ΠΈ ΡΠ΄ΡΠ°Ρ Π² ΡΠ΅Π·ΠΎΠ½Π°Π½ΡΠ½ΠΎΠΉ ΠΎΠ±Π»Π°ΡΡΠΈ ΡΠ½Π΅ΡΠ³ΠΈΠΉ
ΠΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΡΠ΅Π°ΠΊΡΠΈΠΈ ΡΠΎΡΠΎΡΠΎΠΆΠ΄Π΅Π½ΠΈΡ ΠΌΠ΅Π·ΠΎΠ½ΠΎΠ² Π½Π° Π½ΡΠΊΠ»ΠΎΠ½Π°Ρ
Π½Π΅ΠΎΠ±Ρ
ΠΎΠ΄ΠΈΠΌΡ Π΄Π»Ρ ΠΏΠΎΠ»ΡΡΠ΅Π½ΠΈΡ ΡΠΏΠ΅ΠΊΡΡΠ° Π²ΠΎΠ·Π±ΡΠΆΠ΄Π΅Π½Π½ΡΡ
Π±Π°ΡΠΈΠΎΠ½Π½ΡΡ
ΡΠ΅Π·ΠΎΠ½Π°Π½ΡΠΎΠ². Π Π΄Π°Π½Π½ΠΎΠΉ ΡΠ°Π±ΠΎΡΠ΅ ΠΈΡΡΠ»Π΅Π΄ΡΠ΅ΡΡΡ ΠΊΠΈΠ½Π΅ΠΌΠ°ΡΠΈΠΊΠ° ΡΠ΅Π°ΠΊΡΠΈΠΈ ΡΠΎΡΠΎΡΠΎΠΆΠ΄Π΅Π½ΠΈΡ Π½Π° ΠΏΡΠΎΡΠΎΠ½Π΅ ΠΊΠ°ΠΎΠ½Π° ΠΈ Π²ΡΡΠΈΡΠ»Π΅Π½Ρ ΡΠ΅ΡΠ΅Π½ΠΈΡ Π² ΡΠ°ΠΌΠΊΠ°Ρ
ΠΈΠ·ΠΎΠ±Π°ΡΠ½ΠΎΠΉ ΠΌΠΎΠ΄Π΅Π»ΠΈ ΡΡΠΎΠΉ ΡΠ΅Π°ΠΊΡΠΈΠΈ Π² ΠΎΠ±Π»Π°ΡΡΠΈ ΡΠ½Π΅ΡΠ³ΠΈΠΈ Π²ΠΎΠ·Π±ΡΠΆΠ΄Π΅Π½ΠΈΡ ΡΠ΅Π·ΠΎΠ½Π°Π½ΡΠ° N(1900)3/2+ Ρ ΠΏΠΎΠΌΠΎΡΡΡ ΡΠΎΡΠΌΡΠ»Ρ ΠΡΠ΅ΠΉΡΠ°-ΠΠΈΠ³Π½Π΅ΡΠ° Π΄Π»Ρ ΠΈΠ·ΠΎΠ»ΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠ³ΠΎ ΡΠ΅Π·ΠΎΠ½Π°Π½ΡΠ° ΠΈ ΠΌΡΠ»ΡΡΠΈΠΏΠΎΠ»ΡΠ½ΠΎΠ³ΠΎ Π°Π½Π°Π»ΠΈΠ·Π°. ΠΠΎΠ»ΡΡΠ΅Π½Π½ΡΠ΅ ΠΎΡΠ΅Π½ΠΊΠΈ ΡΠ΅ΡΠ΅Π½ΠΈΡ ΡΠΎΠ³Π»Π°ΡΡΡΡΡΡ Ρ ΠΈΠΌΠ΅ΡΡΠΈΠΌΠΈΡΡ ΡΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΡΠΌΠΈ Π΄Π°Π½Π½ΡΠΌΠΈ.Investigations of the photoproduction of mesons on nucleons are necessary for obtaining the spectrum of excited baryon resonances. In this paper, we study the kinematics of the photoproduction reaction on the proton of the kaon and calculate the cross sections in the framework of the isobar model of this reaction in the region of the excitation energy of resonance N (1900) 3/2 * using the Breit-Wigner formula for isolated resonance and multipole analysis. The obtained estimates of the cross section agree with the available experimental data
The origin of paramagnetic magnetization in field-cooled YBa2Cu3O7 films
Temperature dependences of the magnetic moment have been measured in
YBa_2Cu_3O_{7-\delta} thin films over a wide magnetic field range (5 <= H <=
10^4 Oe). In these films a paramagnetic signal known as the paramagnetic
Meissner effect has been observed. The experimental data in the films, which
have strong pinning and high critical current densities (J_c ~ 2 \times 10^6
A/cm^2 at 77 K), are quantitatively shown to be highly consistent with the
theoretical model proposed by Koshelev and Larkin [Phys. Rev. B 52, 13559
(1995)]. This finding indicates that the origin of the paramagnetic effect is
ultimately associated with nucleation and inhomogeneous spatial redistribution
of magnetic vortices in a sample which is cooled down in a magnetic field. It
is also shown that the distribution of vortices is extremely sensitive to the
interplay of film properties and the real experimental conditions of the
measurements.Comment: RevTex, 8 figure
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