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Phase diagram for solid oxygen. Six different phases of solid oxygen are known to exist: [1] [6] α-phase: light blue – forms at 1 atm, below 23.8 K, monoclinic crystal structure, space group C2/m (no. 12). β-phase: faint blue to pink – forms at 1 atm, below 43.8 K, rhombohedral crystal structure, space group R 3 m (no. 166). At room ...
There are six known distinct phases of solid oxygen. One of them is a dark-red O 8 cluster. When oxygen is subjected to a pressure of 96 GPa, it becomes metallic , in a similar manner to hydrogen , [ 14 ] and becomes more similar to the heavier chalcogens , such as selenium (exhibiting a pink-red color in its elemental state), tellurium and ...
4) was discovered in 2001, [45] [46] and was assumed to exist in one of the six phases of solid oxygen. It was proven in 2006 that this phase, created by pressurizing O 2 to 20 GPa, is in fact a rhombohedral O 8 cluster. [47] This cluster has the potential to be a much more powerful oxidizer than either O 2 or O 3 and may therefore be used in ...
In a solid, constituent particles (ions, atoms, or molecules) are closely packed together. The forces between particles are so strong that the particles cannot move freely but can only vibrate. As a result, a solid has a stable, definite shape, and a definite volume. Solids can only change their shape by an outside force, as when broken or cut.
Although oxygen is the most abundant element in Earth's crust, due to its high reactivity it mostly exists in compound forms such as water, carbon dioxide, iron oxides and silicates. Before photosynthesis evolved, Earth's atmosphere had no free diatomic elemental oxygen (O 2). [2]
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Solid: A solid holds a definite shape and volume without the need of a container. The particles are held very close to each other. Amorphous solid: A solid in which there is no far-range order of the positions of the atoms. Crystalline solid: A solid in which atoms, molecules, or ions are packed in regular order.
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