Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: 3D Crystallographic Alignment of Alumina Ceramics by Application of Low
  Magnetic Fields   Non-cubic crystals exhibit anisotropic physical and functional properties.
Microscopic crystallites as constituents of polycrystalline materials are
randomly oriented, thus polycrystalline ceramics lack the anisotropic
properties of their monocrystalline counterparts. We propose a technology that
exploits the synergy between magnetic alignment and colloidal ceramics
processing, and enables to independently tune the orientation of grains in
different sample regions by infinitesimal magnetic fields (<10 millitesla). The
grain pivot mechanism enables the emulation of single crystals, as well as the
creation of large complex-shaped ceramic elements with designed
crystallographic landscapes and spatially and directionally tuned properties.
Ultra-high magnetic response arises from magnetic shape anisotropy of
platelet-shaped seed crystallites coated with small amounts of iron oxide
nanoparticles. To control crystallographic growth directions during subsequent
annealing procedures, the seeds are dispersed and aligned in a matrix of
chemically identical, but much finer spherical particles. The degree of
crystalline orientation in accordingly prepared aluminum oxide exceeds 99%.
This technology opens an avenue to remarkably improve structural and functional
properties of ceramic elements employed in numerous industrial applications.

23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn