The Wondrous World of Perovskites - with Mike Glazer

In the 2017 Bragg Lecture, Mike Glazer unearths the vital world of perovskites, the crystalline materials that make up 38% of the Earth's volume.
Q&A: • Q&A - The Wondrous Wor...
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The crystalline materials known as Perovskites make up 38% of the volume of the earth. Moreover, they have many very important practical uses, for example in electronics, ultrasonics and in thermal sensing devices. So what are they exactly? Mike Glazer explains how tiny changes in their crystal structures can lead to such a vast array of different properties and why they are so important in our daily lives.
This Discourse is supported by the Bragg Lecture Fund and was filmed on 31 March 2017.
Mike Glazer is an Emeritus Professor of the Oxford University Department of Physics. He is the Vice President of the International Union of Crystallography and recently wrote 'A Very Short Introduction to Crystallography' for Oxford University Press.
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[@aatt3209]

Thank heavens that the Braggs were accomplished artists, shown during the first two minutes was a lovely watercolor painting. I am so grateful that Glazer gave credit to both science and art working together to enable the Braggs to solve problems and kicked off x-ray crystallography. And I am also very grateful for RI making Glazer's lecture available to the public. Glazer is an incredible professor.

[@skimmilktwo]

absolutely love his subtle flexes throughout this

[@ShafiqIslam]

loved the lecture and its a true honor to have a chance to watch this ...thank u professor

[@sofiamcgee-renedo7638]

Beautifully summarised the lead -up to the discovery of perovskites and the current stage or research. Wonderful !!!

[@kallansi4804]

Not many videos that can have my attention till completion ... really I loved this guy

[@lacyhart2043]

Really good thanks for the upload want another

[@ahanchakrabortty2254]

One of the best lectures

[@michaelkaliski7651]

This is real science!

[@uchedike4708]

Many thanks for this remarkable lecture. It highlights new frontiers for technological growth and development.

[@mikeglazer4816]

I am glad you found it useful

[@garymenezes6888]

Amazing how far the field of solar Perovskites have come in such a short time. Is there a thermoelectric perovskite, and is there a possibility of layering/adhering this to a solar perovskite to produce higher efficiency solar cells?

[@leonardospuri8246]

Brilliant

[@ddorman365]

Long live the Queen :). Thank you Ri for this inspiring Lecture of what Is possible now and in the future, Geometry Ruuules!!, peace and love, Doug :).

[@sumedhshirsat1434]

Hello Sir, I'm about to start working on a research project related to perovskite(Solar Cell and Quantum dots, also possibly explore the semiconducting properties and its sensing applications). This lecture has been of great help to me for getting to know the fundamentals. So, I was about to download the ppt but the link seems to be down again. I'm getting a 404 error. Kindly help me with the link. @Mike Glazer

[@shankee95]

Really interesting .

[@TheSandreGuy]

Finally a lecture with focus on chemistry.

[@ishanr8697]

Physics :)

[@cortster12]

Chemistry is just a subset of physics :)

[@TheSandreGuy]

No, he may be a physicist, but this subject is heavy on chemical bonds and them giving rise of the properties he talks of.

[@TheSandreGuy]

Reductionist fallacy. No. The models of chemistry and physics are different and need to be in order to explain what they are meant to explain. Take the nuclear-physical model versus the nuclear-chemical model. The physical model works to explain the radiation being released but can't explain the actual change of identity of the element. The chemical model can't explain the radiation but do explain the change in identity. Both models are empirically true yet incompatible. Drop the hubris.

[@ishanr8697]

Solid state physics. "Solid-state physics is the study of rigid matter, or solids, through methods such as quantum mechanics, crystallography, electromagnetism, and metallurgy. It is the largest branch of condensed matter physics. Solid-state physics studies how the large-scale properties of solid materials result from their atomic-scale properties. Thus, solid-state physics forms a theoretical basis of materials science. It also has direct applications, for example in the technology of transistors and semiconductors."

[@lohphat]

The video director should always keep in mind the video feed's audience -- several overhead displays were not switched to the video feed so that we could see them properly. e.g. the person detection video of the participants entering the auditorium.

[@godfreecharlie]

lohphat I concur. Many of the displays were up for too brief a time to be of any use. Just started reading or viewing the overhead and bang! Back to the table, which by the way looked like it had some interesting stuff too. Hate it when printed material or pics are put on screen only to be removed before even a fleeting glance. The audio could have been a bit crisper also.

[@surmenev]

Excellent!

[@mikeglazer4816]

I am glad you liked the lecture

[@toddvanderheyden9774]

He talks a little of the cryogenic effect where freezing changes shape of crystals and increases polarity of substances

[@TheVocoderGuy]

Genes carry information which is non physical (Genome) using patterns of structures called Nucleotides (rungs of the ladder). Can Perovskites carry information using different configurations as letters are to a language?

[@bladdnun3016]

In theory, sure, many things can be used to encode information. However, it wouldn't be at all practical to encode information in a perovskite structure (or any crystal structure for that matter) as nature does in DNA. This is mostly because we don't really have tools to easily and specifically manipulate single atoms or tiny sections of crystals chemically. Nature manipulates DNA and other molecules with the use of enzymes, but compared to this level of precision, modern chemists are little more than cavemen. We are able to synthesize fairly complex molecules (and, to a lesser degree, crystals), but only with great effort and often with a healthy dose of trial and error.

[@TechNed]

Connect a tantalum cap accidentally backwards and you get the most beautiful pink flame.

[@supreethbhaskar3405]

Can anyone help me access the powerpoint presentation used here?

[@juancassinerio1580]

im really starting lo love perovskites

[@oluwatosinobaseki4087]

Do you still like it?

[@juancassinerio1580]

@@oluwatosinobaseki4087 it was a joke

[@ben_swain]

36:15 He mentions that there's a "mystery ingredient" which he will not tell us, but the element portions in parenthesis add up to 100%. Was the mystery element accidentally included, or is the mystery element excluded and the proportions need to be adjusted?

[@davidnacar3454]

There's also the possibility of a trace compound and everything is just rounded to the closest hundredths.

[@ergohack]

Maybe some sort of doping akin to semiconductors...

[@MihirrPanchaal]

How are the octahedra or the cations moved reliably in every unit cell?

[@shishkabobby]

The octrahedra are formed because they are energetically favorable. This configuration corresponds with the lowest energy state. So as long as the processes that produced a particular crystalline structure can be reproduced, you should be able to grow this structure every time you grow it. Does that address your question?

[@TheNefari]

It seems, that the actual unit cell is far simpler (because bricks do not overlap) the one shown here (BaTiO3) does overlap to show where to connect them.

[@mikeglazer4816]

You are strictly correct. The other atoms on each corner/edge/face belong in neighbouring unit cells. However when we make models showing the unit cell contents, then we normally include the other atoms just to make it look symmetric and pretty!

[@cppmsg]

Need to see the pictures more than the lecturer.

[@darkpandemic5802]

wow never was shown so many ads in a video about 50+

[@rogerfroud300]

I think a good explanation of what an Ion and Cation are would have helped. I'd like to bet that very few in the audience have any idea what those are. It's obvious to chemists, but not to lay people.

[@beeble2003]

Is this not taught in GCSE science? That's a a mandatory subject for all 14-16 year olds, so everybody in the audience should have known it at some point.

[@soplv605]

I would like to use this lecture as a souce for my thesis introduction, is there an official transcript to be found anywhere?

[@TheRoyalInstitution]

Hi Sop LV, we unfortunately don't have an official transcript. We own the copyright for the recording, but the lecture itself is owned by Mike Glazer, so we're unable to provide this. We're really pleased that you enjoyed the lecture and hope you find a way of using it.

[@mikeglazer9080]

You can download my Powerpoint at http:/www.amg122.com/BraggLecture/Ri.pptx

[@soplv605]

Thank you so much for replying to my question, I truly enjoyed this lecture. Unfortunately the posted link does not seem to work. I get a "404-File or directory not found" error message.

[@mikeglazer4816]

Sorry about that. Please try www.amg122.com/BraggLecture/RI.zip

[@soplv605]

This works perfectly, thank you!

[@bertarissen6568]

Maybe the "magic" ingredient where Mike talks about in the modified lead zirconate is uranium.

[@kjettilfelterus6889]

...please, show the slides !

[@mikeglazer4816]

http:/www.amg122.com/BraggLecture/Ri.pptx

[@chandanvishwakarma6480]

Sir, the above link is not available, please send it again. @@mikeglazer4816

[@taka-taktak]

I am doing my dissertation for masters degree on perovskites.

[@MANISHSINGHPAWAR]

Give a slap to cameraman, instead focus on the projector he is showing the audience

[@RandyLunn]

It look to me that he got the basic Perovskites crystal structure wrong. The B cations should be face-centered not directly between the A cations.

[@mikeglazer9080]

No the B cations sit at the corners of a cube (in the basic structure) with the A cation at the centre of the cubic cell. Alternatively you an shift the origin of the unit cell so that the A cations are at the corners and the B cation is at the centre.

[@Dragon90815a]

put photovoltaic one in a dark room and put a hair dryer and see what properties develops

[@ShafiqIslam]

ha ha ha

[@13minutestomidnight]

Awesome stuff. Very interesting and insightful, and thankyou RI once again. But wow, his explanations are great but he shifts through so much material so fast, you have to really be paying attention. Note to self: Must come back and rewatch this when the pain's doing better.

[@mikeglazer4816]

Sorry for such a high speed but I had a lot of material to get through in one houre

[@eglintonflats]

Have you replaced camera operator yet?

[@ShafiqIslam]

yeah dude ...they should replace them with professors .

[@thaddeuswalker2728]

Guess: Anti-submarine detective. Dic is often short for detective

[@androidkenobi]

47:11 what is a mexican wave?

[@Bugside]

lmgtfy.com/?q=mexican+wave

[@emmanuelsoto1989]

The kind of chronicles that set davinci on his feet. I witness this in the name of Jesus Christ that this is true.

[@steveg9523]

Too many adverts