نتایج جستجو برای: pzt 5h
تعداد نتایج: 4643 فیلتر نتایج به سال:
در این تحقیق تأثیر افزودنی های اکسیدیِ لانتانیم و نئودیم بر ریزساختار و خواص الکتریکی پیزوالکتریک های محلول جامد تیتانات زیرکونات سرب با ترکیب در محدوده ی مرز مورفوتروپیک بررسی شده است. برای این منظور، اکسید لانتانید به مقدار صفر تا ۳ درصد مولی به ترکیب پایه ی $p b_{1.1}(z r_{0.53}t i_{0/47}) o_3$ اضافه شده که روش ساخت آنها طبق روش معمول ساخت سرامیک ها است. مشاهده شده است که افزودن ۲٪ مولی از اف...
High dielectric capacitor, that has around 1000 in dielectric constant, can be successfully formed by nanotransfer on non-heat-resisting substrates. PZT film could be released from the Si substrate and bonded onto the polymer one. The releasing characteristics have the relationships with the thickness of Pt layer. The formed PZT has perovskite structure and clear columnar texture.
In many MEMS applications there is a requirement for actuating a structure. This paper describes a method of generating acoustic power from a PZT based thick-film structure which gives output power and electrical efficiencies at least as good as, and in some cases better than bulk PZT in the same application.
Electrode stability, interdiffusion, phase purity and deviation from stoichiometry at the PZT-electrode interface are key issues in PZT thin film integration. This article highlights the use of transmission electron imaging combined with energy dispersive spectroscopy (EDS) for the investigation of these phenomena. The accuracy of the EDS analysis is discussed. It will be shown that using a sta...
This paper reports lead zirconate tit silicon electromechanical resonators wit terminated, performances for RF appl 2.14 dB insertion loss is demonstrat extensional, PZT-on-2-μm-silicon 15 M 22 dB return loss and maximum unload QUL,max, of ~540 in air resulted for this r performances with a QUL,max of demonstrated with a PZT fabricated device. The competing effects of de resistance and increase...
In various industries such as power plants, ultrasonic non-destructive testing (NDT) is widely used because of cost effectiveness and sub-surface defect/flaw detection capability. Piezoelectric films made of sol-gel composites could be useful as ultrasonic transducers due to high tempearature durability, reasonable signal strength, curved surface suitability, relatively low center frequency suc...
The effects of carcinogenic heterocyclic amines and beta-carbolines on 5-hydroxytryptamine-induced human platelet aggregation, on the uptake of 5-hydroxytryptamine by platelets, and on human monoamine oxidase activity were investigated. Of the dietary carcinogens and beta-carbolines studied, carcinogenic tryptophan pyrolysis products had greater pharmacological activities than other heterocycli...
Novel representatives of the important group of biologically active dibenzosuberone derivatives were prepared: 3,7-dibromo-5-(dimethylaminoethyl- oxyimino)-10,11-dihydro-5H-dibenzo[a,d]cyclohepta-1,4-diene (1), 3,7-dibromo-5-(3- dimethylaminopropylidene)-10,11-dihydro-5H-dibenzo[a,d]cycloheptene (2) and 1,7- dibromo-5-(3-dimethylaminopropylidene)-10,11-dihydro-5H-dibenzo-[a,d]-cycloheptene (3)....
The finite element micromagnetic simulation is used to study the role of complex composition 2:17R-cell boundaries in realization magnetization reversal processes (Sm, Zr)(Co, Cu, Fe)z alloys intended for high-energy permanent magnets. A modified sandwich model considered combinations 2:7R/1:5H phase and 5:19R/1:5H layers as alloy structure. results represented form coercive force vs. total wid...
در این پایان نامه مراحل طراحی، شبیه سازی، ساخت و تست سنسور فشار مبتنی بر لایه نازک pzt، نشان داده شده است. در ابتدا دیافراگمی بصورت چند لایه متشکل از لایه های pt / ti / pzt / pt / ti / sio2 توسط نرم افزار اجزای محدود ansys fe® طراحی و شبیه سازی شده است. سپس مشخصات دینامیکی دیافراگم چند لایه مورد بررسی قرار گرفته و برای عملکرد مطلوب تر سنسور، بهینه شده است. با توجه به این پارامترها، دیافراگم سنس...
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