Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High-Pressure Synthesized Materials: a Chest of Treasure and Hints   The present review covers the production of new materials under high
pressures. A primary limitation on the use of pressures higher than 1 GPa is a
small volume and mass of a produced material. Therefore, despite an extremely
wide range of new high-pressure synthesized substances with unique properties,
synthesis on an commercial scale is applied up to now only to obtain superhard
materials, this real treasure of today's industry. At the same time,
high-pressure experiments often give material scientists a hint at what new
intriguing substances can exist in principle. This is true for new superhard,
semiconducting, magnetic, superconducting and optical materials already
synthesized under pressure, and as well as for a large number of hypothetic new
polymers from low-Z elements. Many of new materials, including the above
polymers, may exist in the metastable form at normal pressure at sufficiently
high temperatures.

36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn