Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Effects of Electrical Characters on Electrical Fatigue Behavior in PLZT Ferroelectric Ceramics (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 280-283 (Feb. 2007), p. 159-162 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Electrical fatigue tests have been conducted on PLZT ferroelectric ceramics. It was found that the higher the applied electrical field magnitude, the faster the Pr decreases; the samples under the same electrical field magnitude but with square wave have higher fatigue rate than that of sine wave. It was observed that at low frequency of applied field (50Hz and 500Hz), the polarization decreased very quickly and dropped below 70% of the original value within 106.2 switching cycles, however, when fatigue test were conducted at high frequencies of 100kHz and 300kHz, the polarization did not change significantly even after 109 cycles. The SEM analysis indicated that the facture mode was mainly of trans-granular forthe virgin non-fatigued sample, while of inter-granular for the fatigue sample. The quantitative information on the 90° domain switching was measured in situ using X-ray diffraction. The effects of electrical characters on electrical fatigue behavior were explained according to the mechanism of electrical fatigue in PLZT ferroelectric ceramics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/48/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.280-283.159.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Effect of Ho〈sub〉2〈/sub〉O〈sub〉3〈/sub〉 Doping on Performance of ZnO Varistor (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 507-509 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The effect of Ho2O3 doping on the electrical properties and microstructure of ZnO base varistorwas investigated. It was found that Ho2O3 is an effective dopant for increasing the breakdown electricfiled. The Ho2O3 doping can also improve the nonlinear performance both in low and high current area.But excessive doping of Ho2O3 will decrease the withstanding surge current. With 0.8mol% Ho2O3doping, the varistor samples exhibit a breakdown voltage of about 400V/mm, a nonlinear coefficient of 80and the withstanding surge current of 8/20μs, waveshape is higher than 5kA. Ho2O3 dopant can hinderZnO grain growth and make the crystal grains more uniform
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.507.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Voltage Response of ZnO Varistors to 8/20 µs Surge Current (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 280-283 (Feb. 2007), p. 285-288 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The voltage response of ZnO varistors to 8/20 µs surge current was investigated. The observed frontal spikes on the residual voltage waveforms are caused by the ignition gap, and no frontal spike was observed when a thyristor was used as the discharge trigger. The rear part of the waveform is determined by the damping coefficient of the RLC-circuit. Near the critical point, the residual voltage waveformchanges from non-oscillating attenuation modes to distinct across zero oscillating modes along with the increase of the peak current, but there will be no oscillation happen when a thyristor is used as the discharge trigger. The residual voltage peak is not synchronized with the current peak, and the voltage peak is leading, implying that the ZnO varistor appears to be inductive. According to the experiment results, it can be reasonably explained that the voltage peak leading phenomenon is attributed to the transient skin effect of the varistor materials
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.280-283.285.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Piezoelectric and Dielectric Properties of (Bi〈sub〉0.5〈/sub〉Na〈sub〉0.5〈/sub〉)〈sub〉0.94〈/sub〉(Ba〈sub〉1-x〈/sub〉Sr〈sub〉x〈/sub〉)〈sub〉0.06〈/sub〉TiO〈sub〉3〈/sub〉 Lead-Free Piezoelectric Ceramics (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 1911-1914 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Lead-free piezoelectric ceramics (Bi0.5Na0.5)0.94(Ba1-xSrx)0.06TiO3 (abbreviated asBNBST-100x, with x ranges from 0.02 to 0.1) have been investigated. Effects of amount ofSr-substitution on the electrical properties and crystal structure of the ceramics were studied. TheBNBST-100x ceramics sintered at 1200°C for 2h in air have high density around 5.69~5.75g/cm3. X-raydiffraction (XRD) analysis shows that all of the BNBST-100x ceramics have pure perovskite structure. Athigh amount level of Sr-substitution, the crystal structure of the samples changes from rhombohedral totetragonal symmetry. Piezoelectric and dielectric measurements reveal that Sr-substitution amount withina certain range will lead to the increase of piezoelectric coefficient (d33), electromechanical couplingfactor (kp), and relative dielectric constant (ε33T/ε0). At 6 mol% Sr-substitution level, the d33 and kp of theceramics reach maximum, with values of 168 pC/N and 34%, respectively
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.1911.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    (Ca,Sr,Ba)TiO〈sub〉3〈/sub〉-Based Dielectrics Sintered in Reducing Atmosphere (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 114-117 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The anti-reducing sintering of (Ca,Sr,Ba)TiO3-based dielectrics was achieved by the cooperatingeffect of Mn2+, Ca2+, Mg2+, Dy3+ and Yb3+. A small quantity of Zr4+ partly substitution for Ti4+ canimprove the temperature dependence of dielectric constant. But ZrO2 will also reduce the solid solubilityof BaTiO3-SrTiO3-CaTiO3 ternary system, and may cause phase separation. The separated ferroelectricphase increases the capacitance change under DC bias. Non-reducible (Ca,Sr,Ba)(Ti,Zr)O3-based dielectricswith single orthorhombic phase of perovskite structure was obtained. The dielectric and DC biasproperties are: .C/C (DC bias: 1.5kV/mm) 〈0.05%, ε =250~300, tgδ 〈 0.5%
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.114.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Piezoelectric and Dielectric Properties of (Bi〈sub〉0.5〈/sub〉Na〈sub〉0.5〈/sub〉)TiO3- (Bi〈sub〉0.5〈/sub〉K〈sub〉0.5〈/sub〉)TiO〈sub〉3〈/sub〉-BaTiO〈sub〉3〈/sub〉 Lead-Free Piezoelectric Ceramics (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 54-57 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A lead-free piezoelectric ceramic ternary system based on (Bi0.5Na0.5)TiO3 (BNT)-(Bi0.5K0.5)TiO3(BKT)-BaTiO3(BT) near the morphotropic phase boundary (MPB) between the tetragonaland rhombohedral phases has been investigated. The samples were prepared by a conventionalsintering technique. Piezoelectric properties, dielectric properties and microstructures ofBNT-BKT-BT lead-free piezoelectric ceramic were studied. The X-ray diffraction (XRD) patternsshow that the ceramics possess a single-phase perovskite structure. The measurements ofpiezoelectric properties reveal that this system has a relatively high piezoelectric performance: thepiezoelectric constant d33 reached to 178pC/N and planar electromechanical coupling factor kpenhanced to 0.325. The BNT-BKT-BT ternary system ceramics could be well sintered at 11500C witha high-density ratio of more than 95% of the theoretical density
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.54.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...