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Miracle Crystal From Sea Water

Single crystal magnesium oxide substrate  MIRACRYSTAR®


Forming large, single-crystal magnesium oxide had been considered difficult, given the material’s extremely high vapor pressure due to the high melting point required. Yet, as a specialized manufacturer in magnesium oxide, in 1968 Tateho achieved the world’s first success in commercializing large single crystals, utilizing its proprietary electrofusion and crystallization technologies.
Today, Tateho continues to produce the world’s largest single-crystal magnesium oxide with a purity of 99.9% or more―MIRACRYSTAR®.
This single crystal MgO "MIRACRYSTAR®" exhibits excellent characteristics, providing infinite possibilities as essential materials for various applications.

  1. "MIRACRYSTAR®" is an excellent substrate in a smooth surface.
  2. "MIRACRYSTAR®" doesn't react with the film at the high temperature.
  3. "MIRACRYSTAR®" is a high thermostability and high nonconductivity.
  4. It is easy to make the epitaxial layer when "MIRACRYSTAR®" is used.
  5. The compatibility of the lattice constant and the thermal expansion coefficient of "MIRACRYSTAR®" with the film is good.
  6. As for "MIRACRYSTAR®", because light transmission properties are good, the measurement that uses optics is possible.


  • Substrate for high temperature superconducting film formation(Filter used for communication and space observation, YBCO)
  • Substrate for ferroelectric film formation(Infrared ray sensor used for thermometer and thermoregulator, PZT)
  • Substrate for diamond growth
  • Substrate for magnetic film formation(MRAM , TMR)
  • Target material for spatter
Model Number
It responds to the consultation according to the amount.


10mm x10mm x0.5mmt
Tolerance of length +0.4mm/-0.0mm
Tolerance of thickness

Up to 101.6φx0.5mm on request.

Standard (100)
Tolerance of plane direction ±0.5°

(110), (111) and other orientation upon request.

Two sides polishing
surface roughness (Ra) <0.5nm
Chemical Properties
  • MgO > 99.9%
  • Ca  200ppm
  • Si  10ppm
  • Al   60ppm
  • Fe  70ppm
  • B   10ppm

* ICP Optical Emission Spectroscopy

※The properties are the typical values and not the guaranteed values.


Chemical name Magnesium Oxide
Chemical formula MgO
CAS number 1309-48-4
Crystal structure Cubic (NaCl)
Lattice constant (10-10m) 4.214
Density (103kg・m-3) 3.58
Specific heat (J・kg-1・K-1) 970
Melting point (K) 3098
Dielectric constant
(ε, R.T.14~16GHz)
Dielectric dissipation factor
Thermal expansion coefficient (10-6・K-1) 13.5
Transmission wavelength regions (μ) 0.3~7.0
Thermal conductivity
Electrical resistance rate (Ω・cm) 1014
Hardness (Mohs) 6
Elasticity modulus (GPa) 245
Compressive strength (MPa) 618
Bending strength (MPa) 186

* The properties are the typical values and not the guaranteed values.



Tateho Chemical Industries Co.,Ltd.

  • Paid-up Capital : JPY 450 Million
  • Number of Employees : Approx.270
  • Establishment : 1966

Received ISO9000, 14000

"Tateho's vision of creating new environment-friendly materials"

Tateho Chemical Industries Co., Ltd. was born in the town of Ako--an area blessed with a warm climate and the abundant marine resources of the Inland Sea of Japan.
The history of the salt industry in Ako is long--dating back nearly 1300 years to the Nara period.
In 1966, Tateho was established as a group of engineers seeking to provide new materials widely useful for society by putting this inherited, time-honored wisdom into full use, and by effectively utilizing bittern, a substance left after separating salt from seawater.
Since then, we have continued to provide the world with highly functional products--including magnesium oxide, magnesium hydroxide, electrofused magnesium oxide, single crystal magnesium oxide, flame retardants, and ceramics--by expanding our businesses on the basis of our proprietary crystallization control technology.
We are committed to contributing to industry worldwide under the slogan of "Aiming to be a development-oriented company friendly to the natural environment and leading the world with proprietary technologies" by continuously adhering to our environmental policy and further improving our proprietary technologies.

It applies for the following patents about Single-Crystal Magnesia product"MIRACRYSTAR®"

Japanese Patent number

  • 4686181
  • 4676796

U.S. Patent number

  • US7544345B2
  • US7691200B2

South Korea Patent number

  • 10-0883228
  • 10-0895118

Chinese Patent number

  • ZL200580045352.8
  • ZL200680009667.2

Electric melting

Electric melting
We melt the raw material selected carefully by electricity.
We achieve the crystal growth by our original technology.

Single crystal mass

Single crystal mass
We take out the maximum magnesium oxide single crystal mass in the world.

Polishing processing

Polishing processing
We cut the single crystal mass , do the polishing processing and finish up the surface.

Single crystal substrate

Single crystal substrate
We do various inspections, and the product is completed.
We can manufacture the substrate up to four inches.