metals's questions - Chinese 1answer

292 metals questions.

I'm writing a book and I need to know if a "defense mechanism" in it would actually work. There is a fire escape ladder (made of metal) leading from a window. The house is completely barred on the ...

For example in liquid metal ion source (LMIS), the positive electrode is wetted by gallium, which forms a Taylor cone towards the negative electrode and emits Ga+ ions. Would a Taylor cone still form ...

I found this graph of nickel magnetic permeability vs frequency,it start to drop at around 250 KHz.Why isnt the permeability constant at all frequencies? Can that frequency curve somehow be ...

In one of my classes this past semester, we did a casting lab. In this lab we used an induction furnace which uses a coil to generate heat within the material. One of the things that I noticed, was ...

In this pdf it says Because the number of electron states in a Brillouin zone is twice the number of primitive cells in a Bravais lattice (the factor two comes from spin), the zone can be ...

The quantum-mechanical (relativistic) explanations for the observed colours of copper, silver & gold don't appear to explain the black colours of powdered silver (& powdered platinum). Can ...

For free electrons in a metal, the Fermi energy $E_F$ (defined as the highest filled energy level at $T=0$). It represents a characteristic energy scale of the system as well as the energy of the ...

I am a little bit confused here. When a metallic nanoparticle is impinged with light at its resonance, the electric field is greatly enhanced at the surface along the polarisation of the wave(suppose ...

I on a project, i required a metal/chemically treated metal/Chemical/anything which repels iron and steel like two same side magents do. I searched in the internet and didn't found anything which ...

Why do most metals (iron, tin, aluminum, lead, zinc, tungsten, nickel, etc.) appear silver or gray in color? (What atomic characteristics determine the color?) What makes copper and gold have ...

Small dispersed particles of metals are often black, while a solid object of the same material would be some shade of silver. The most notable example is the use of metallic silver as the black color ...

I was solving some problem regarding the polarization during this I came across an example 4.5 in Griffith's where it is written that the Electric field inside the metal sphere carrying a charge Q is ...

This is a nice question when you find it out, and I am really looking for a proper answer. Take quicksilver (Hg) in the periodic table. It has one proton more than Gold (melting point 1337.33 K), and ...

Corrosion is about losing electrons for the corroded metal and gaining electrons for the oxidising substance. Is it correct to assume that what controls this process is the electron degeneracy ...

Physically, why is it that the electrons need to excited above the Fermi level to conduct electricity? In other words, why is the current zero when the electrons lie below the Fermi level? Does Pauli ...

I am currently looking for the Equation of state used for metals (fluid state) for CFD Application on metallurgy. Do you know a book where I can find them?

I want ask about the raman tensor of graphene all that I know, the raman spectrum of graphene has 2 main peak G and 2D. but what about its tensor raman. I know that the metals materials don't have ...

I am curious to know a way that will make infrared pass through metals. Metals are good reflectors of infrared,can we manipulate the wave in order to make them pass through metals?.

So in solid metals they atoms give off electrons, which are delocalised and hold together all the metal atoms. But that's not the case in liquid metals, right? What holds together the individual atoms ...

I'm musing about how to give students an intuitive feeling about density by letting them lift a same sized volume of different materials, e.g. 1 liter of water, a $10 {\times} 10 {\times} 10 \, \...

The majority of metals are known for appearing grey to our eyes, cf. e.g. Why are most metals gray/silver? But the main exceptions to this are the "famous" group eleven metals, where their distinctive ...

If a radio wave hits a thick piece of metal, it's my understanding that the metal will for the most part reflect the wave. What I'm unclear about is how the electrons flow in a metal that's being ...

I was reading and I saw that the steel becomes permanent magnet whereas iron becomes a temporary magnet after magnetization during magnetic induction. Why does soft iron make temporary magnets and ...

The photoelectric effect says that the energy of a photon, if greater than the work function of a metal will liberate an electron from it. The additional energy of an electron just gets converted into ...

The answer is probably no. But can you make a metal denser by melting it and make it cool down under high pressure? Or would it just crack under internal stress when it returns to a solid? I'm going ...

Silver is metal with highest electrical conductivity.I read that it have highest optical reflectivity,that it shines most from all metals. Is there link between conductivity and how shiny the metal ...

I was told that it is possible to describe frequency dependent properties of metals in terms of the equations of motions of the charge carriers. In order to do so the Drude model can be exploited and ...

When a metal cools from its liquid state, part of the nucleation happens from pre-existing clusters (a group of unit cells of the crystal lattice) already present in the liquid. In the case of a ...

In GHz applications, Cu is mainly used to make structures and in THz applications Al or Au is used to make structure. Is there a special reason to use these metals in particular wavelengths?

Question: Say that we had metallic water and compressed it until it qualitatively resembled the state of matter in a white dwarf: what would that transition look like? Background (revised to be ...

What is the difference of making metal contacts to carbon nanotubes and metal contacts to silicon in Si MOSFETs? How does this impact the ON/OFF ratios of transistors?

Why don't metals glow from red to yellow to green to blue etc.? Why only red, then yellow and then white? Shouldn't all wavelengths be emitted one by one as the temperature of the metal increases? ...

I am looking for an answer that is just a bit deeper than "because copper has a full 3d shell, thus no unpaired electrons". Iron has a magnetic moment of 2.2 bohr magnetons per atom. You can explain ...

Let's suppose that we placed a charge nearby one of the end of the long metallic rod (the length of the rod is $L$). Without rod, an electric field will decrease as an inverse square of the distance ...

Why spin-orbit coupling difference is smaller in TiO2 than Ti metal? Like in the figure

What is speed of sound in liquid galium? I see water have speed 1400 m/s,and ice 4000 m/s so the change is very big in solid/liquid phase change,I assume same is true for pure metal like galium.There ...

How can I (preferably analytically) find the sheet resistance of a metal film which has circular holes in a square lattice? Is it enough to set the total area of the sheet without holes in relation ...

My left earbud recently broke mid-wire: the bit that I like to fiddle with and bend. I fixed it, but I was wondering whether there are metals that don't work harden, or resistant to it? Is there a ...

A lot of gold was moved from it source in the west to Europe and other world powers in the 16th and following centuries and I was curious if such gold artifacts could be tied to their source or not. ...

edit: I found this reprint but I don't know how to convert a small table of $\epsilon_1, \epsilon_2$ to a complex index of refraction $n, k$ at 3.1 $eV$ (400 $nm$). However there is a note at the end ...

It is my understanding that metals are a crystal lattice of ions, held together by delocalized electrons, which move freely through the lattice (and conduct electricity, heat, etc.). If two pieces ...

I am reading this book, to understand magnetism in material. It is stated there that the d-bands overlap the next higher s-band. I am aware about Hund's rule. How to see that in the band diagram? ...

I am trying to plot the dispersion relation ($\omega-k_x$ plot) of a surface plasmon polariton on a generic metal-air interface. For this we can derive a general dispersion relation from Maxwell's ...

When two different metals come in contact, a junction at their contact is created. What is the name of that junction?

Except for metallic and semimetallic oxides, is there any oxide (non-metallic oxide) which remains in the solid state at room temperature?

If the grain size of a material varies, what does happen? Are the permeability and resistivity of the material changed with the variation of that grain size? If they do, how they do?

I cook frequently with aluminum foil as a cover in the oven. When it's time to remove the foil and cook uncovered, I find I can handle it with my bare hands, and it's barely warm. What are the ...

What determines how large a crystal of iron will grow when heat and pressure are applied? I was thinking about the Earth's core. Some have postulated that a large iron crystal is at the center of the ...

When I was last working on the highway, I stopped to help a motorist parked under high tension power lines. I'm driving a large Ford Transit van, fairly box shaped. My van was parked 90 degrees (...

Or any other silver surface? Perfect silver "colour" just seems to be "reflecting gray", so something that absorbs all wavelengths by the same fraction and reflects everything else specularly. When I ...

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