Ferroelectrics and Piezoelectrics

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Күн бұрын

Пікірлер: 24

@anarchistalhazen7084 4 жыл бұрын

Man, I really appreciate your videos so much. Even, now whenever I want to eat I play your videos instead of browsing netflix or youtube for such.

@TaylorSparks 4 жыл бұрын

Oh thank you so much!

@NikhilRamesh-b2e Жыл бұрын

Really helped me in my mid-term, Thank you🙌

@chaorrottai Жыл бұрын

What you characterised, the orthogonal response, is why heat pumps can have coefficients of perfomance that not only exceed 1 but exceed 2 against a positive slope. It's the difference between making something happen and something happening as a consequence. I'll gve an example: Imagine a ring of nickel connected to a driveshaft with spokes. On one side of the ring, a magnet is placed to attract the ring and, at the same time, a heat source heats the segment of the ring closest to the magnet to it's curie temperature so that part losses it's ferromagnetism. Once the ring is in motion, it will continue spinning at fixed rpm with a fixed torque where the rpm is determined by the rate of heating and cooling, the thermal cycling will be approximately 30 deg c due to transition temp hysteresis, and the torque is entirely dependant on the strength of the magnet used. You don't turn the rotor with the power you input, the power you input simply modulates which section of the rotor is attracted to the magnet. As a consequence, to a certain extent up to saturating the nickel, if you want more torque you just use a bigger magnet and the rpm stays the same. That's under load, typically, people build these things and run them unloaded but these motor move in a reay uneven way when that is done.

@rittwikchatterjee5347 3 жыл бұрын

Really loved this one!

@lulumao6573 3 жыл бұрын

Thank you so much! I finally know what is ferroelectrics !!!

@TaylorSparks 3 жыл бұрын

Woohoo! Glad to help Yulu!

@SunilPatil-tq5cb 3 жыл бұрын

Too good sir!👌

@akshatrastogi9063 3 жыл бұрын

Hello Prof. Sparks, Which lecture did you point to when you say at 3:50 "we have talked about this previously". I am asking this as I wanted to understand the fundamental difference between grain and domain.

@TaylorSparks 3 жыл бұрын

Probably here when we talked about grain boundaries at first? kzbin.info/www/bejne/pIrXf3yBo7mCocU

@Edin12n 3 жыл бұрын

Hi Taylor. Great video. Where would I find the ME3310 course you refer to please. Also, are there any books you'd recommend? I'm interested in PZT (particularly pyroelectrics). Thanks

@TaylorSparks 3 жыл бұрын

We offer MSE 3310 every spring at the University of Utah.

@Edin12n 3 жыл бұрын

@@TaylorSparks I'm in Scotland so that probably rules me out. Was hoping the course might be on an online platform like coursera or edx

@TaylorSparks 3 жыл бұрын

@@Edin12n bummer. Not yet.

@Edin12n 3 жыл бұрын

@@TaylorSparks Ha Ha I couldn't have put it better : )

@TaylorSparks 3 жыл бұрын

@@Edin12n I'll likely be in Liverpool for a year (2022-2023) teaching. I'll offer a few courses while I'm there.

@akshatrastogi9063 3 жыл бұрын

Hello Prof. Sparks, I had a doubt regarding the orientation of the polarization vector across the domain walls. Is it true that the angle between the spontaneous polarization vector between two adjacent domains is either 90 degrees or 180 degrees?

@TaylorSparks 3 жыл бұрын

I wish I knew more!