Gamma alumina

Japanese: γアルミナ - がんまあるみな

...Alumina porcelain is used for various purposes, taking advantage of its electrical insulation, hardness, wear resistance, and biofunctions. γ-alumina (activated alumina), obtained by thermally decomposing thermally decomposable aluminum salts, has a very small crystal grain size, a large surface area, and is chemically stable, and is used as a catalyst, catalyst carrier, adsorbent, etc. Single crystal alumina made by flame fusion method (Bernoulli method), hydrothermal method, pulling method, etc. is used for artificial gemstones, ruby laser rods, integrated circuit boards, etc. ...

[Aluminum oxide]

... Specific gravity 3.3. (3) γ-alumina Equiaxial crystal system. Oxygen is cubic close-packed. ...

*Some of the terminology that refers to "γ alumina" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…アルミナ磁器は，その電気絶縁性，硬質性，耐摩耗性，生体機能などを利用して各種用途に利用される。熱分解性のアルミニウム塩類を加熱分解して得られるγ‐アルミナ(活性アルミナ)は，結晶粒径の非常に小さなもので，表面積が大きく，化学的にも安定であり，触媒，触媒担体，吸着剤などに用いられる。火炎溶融法(ベルヌーイ法)，水熱法，引上げ法などによってつくられた単結晶アルミナは，人造宝石，ルビーレーザー用ロッド，集積回路基板などに使われる。…