I am not an astronomer. I'm an engineer, but I do have a general interest in space because I like physics and all that. I'll assume your questions are in good faith and try to provide answers.

1. I am not a chemist and don't work with ozone, but the conventional science claims about ozone, how it is produced, and the so called "layer" where it has a significant concentration in the stratosphere are well known. I have no reason to doubt those claims, but would look into anything someone offered that was disputing them. Otherwise, as far as I know, ozone (O3) exists, can be made from ordinary oxygen (O2), and there is a layer with a lot of it in the stratosphere.

2. I am not familiar with the oxygen phase diagram, but I took thermodynamics as a part of engineering school so I am aware of the fact that pretty much everything can exist as a solid, liquid, and gas (and even plasma), although the conditions may be extreme. The video you linked shows that the triple point of O2 is around 54.4 K and 0.0015 bar. Further, you can get some data on solid oxygen at Wiki. I have no reason to doubt these numbers, but would not vouch for them.

3. The "temperature of space" is dependent upon where you are. The temperature you are quoting is the background temperature that would be expected far from anything. Near the earth, there is tremendous variation from the day side to the night side. The day side sees sun no different than we would see in the tropics, but even stronger since there is no atmospheric filtration. The night side can get closer to the background temperature of space, but still substantially higher because the warm earth radiates up at you. If you move far enough away from the earth that this is negligible, then the notion of "the night side" goes away because the earth gets smaller and smaller the farther away you get. For example, a full solar eclipse is what "the night side" of the moon looks like from earth, if that makes sense.

I don't want to attribute something to you that you are not saying, but it kind of sounds like you are asking a firmament sort of question. I am not sure if this "wall of oxygen ice" you are referring to is supposed to be a dome over a flat earth or a bubble surrounding a spherical earth. In either case, it seems rather doubtful to me. This question need not even apply to oxygen. That just makes it seems more mysterious (and therefore plausible). But your question could just be in regards to ordinary water ice, since water will be frozen at the background temperature of space. So in that case, why is there no wall of water ice in the sky?

We all know why, of course. Ice is too heavy and not strong enough hold itself up like this. Igloos are limited in size, and such a wall needs to hold together during the sunshine on the day side of the earth which will warm and soften it. Using the density quoted at the Wikipedia article I linked, oxygen ice is also too dense to form such a giant sky wall, although it does seem to be less dense than water ice.

If you are asking about a firmament, it does not bother me if people believe these things but I'll tell you that it is not too difficult to understand how the atmosphere remains attached to the earth and does not just evacuate into space.

I am not an astronomer. I'm an engineer, but I do have a general interest in space because I like physics and all that. I'll assume your questions are in good faith and try to provide answers.

1. I am not a chemist and don't work with ozone, but the conventional science claims about ozone, how it is produced, and the so called "layer" where it has a significant concentration in the stratosphere are well known. I have no reason to doubt those claims, but would look into anything someone offered that was disputing them. Otherwise, as far as I know, ozone (O3) exists, can be made from ordinary oxygen (O2), and there is a layer with a lot of it in the stratosphere.

2. I am not familiar with the oxygen phase diagram, but I took thermodynamics as a part of engineering school so I am aware of the fact that pretty much everything can exist as a solid, liquid, and gas (and even plasma), although the conditions may be extreme. The video you linked shows that the triple point of O2 is around 54.4 K and 0.0015 bar. Further, you can get some data on solid oxygen at Wiki. I have no reason to doubt these numbers, but would not vouch for them.

3. The "temperature of space" is dependent upon where you are. The temperature you are quoting is the background temperature that would be expected far from anything. Near the earth, there is tremendous variation from the day side to the night side. The day side sees sun no different than we would see in the tropics, but even stronger since there is no atmospheric filtration. The night side can get closer to the background temperature of space, but still substantially higher because the warm earth radiates up at you. If you move far enough away from the earth that this is negligible, then the notion of "the night side" goes away because the earth gets smaller and smaller the farther away you get. For example, a full solar eclipse is what "the night side" of the moon looks like from earth, if that makes sense.

I don't want to attribute something to you that you are not saying, but it kind of sounds like you are asking a firmament sort of question. I am not sure if this "wall of oxygen ice" you are referring to is supposed to be a dome over a flat earth or a bubble surrounding a spherical earth. In either case, it seems rather doubtful to me. This question need not even apply to oxygen. That just makes it seems more mysterious (and therefore plausible). But your question could just be in regards to ordinary water ice, since water will be frozen at the background temperature of space. So in that case, why is there no wall of water ice in the sky?

We all know why, of course. Ice is too heavy and not strong enough hold itself up like this. Igloos are limited in size, and such a wall needs to hold together during the sunshine on the day side of the earth which will warm and soften it. Using the density quoted at the Wikipedia article I linked, oxygen ice is also too dense to form such a giant sky wall, although it does seem to be less dense than water ice.

If you are asking about a firmament, it does not bother me if people believe these things but I'll tell you that it is not too difficult to understand how the atmosphere remains attached to the earth.