Synthesis of high-crystallinity cubic-GaN nanoparticles using the Na flux method—A proposed new usage for a belt-type high-pressure apparatus

High pressure densification and dielectric properties of perovskite-type oxynitride SrTaO2N

“…The synthesis and sintering of metal nitrides have been examined on optical, magnetic, electronic and refractory materials, such as GaN, FeN x , BN, and AlN [10][11][12][13][14][15].…”

Precursor chemistry of metal nitride nanocrystals

“…164 Finally, crystalline GaN NCs were formed from NaN 3 and metal Ga by heating to 700 °C under nitrogen in a high-pressure apparatus. 165 Janik et al formed GaN NCs via pyrolysis at 450-500 °C of a gallium imide [Ga(NH) 3/2 ] n precursor (obtained by reaction of [Ga(NMe 2 ) 3 ]2 and NH 3 ). 166 In 1999, this method was improved by crystallizing the [Ga(NH) 3/2 ] n precursor in hot trioctylamine (360 °C for 24 h) under a flow of ammonia.…”

“… 164 Finally, crystalline GaN NCs were formed from NaN 3 and metal Ga by heating to 700 °C under nitrogen in a high-pressure apparatus. 165 …”

Processing of dielectric oxynitride perovskites for powders, ceramics, compacts and thin films

“…On the other hand, the decomposition of thermally unstable compounds that release nitrogen gas at high temperature can also be applied to form a very high-pressure N 2 atmosphere in a high pressure capsule. Cubic GaN nanoparticles have been obtained from Ga metal and sodium azide (NaN 3 ) which was decomposed in a spherical nickel capsule at 400-700 °C and 0.8 GPa in a belt-type high pressure apparatus to produce a nitrogen gas pressure of 330 MPa 48 . The use of high oxygen pressure produced by a decomposition of metal peroxides in a high-pressure capsule has been well established rather than nitrogen gas and novel perovskite oxides consisting of an abnormally high valence transition metal, such as Fe .…”

“…Cubic GaN nanoparticles have been obtained from Ga metal and sodium azide (NaN 3 ) which were decomposed in a spherical nickel capsule at 400-700 °C and 0.8 GPa in a belt-type high pressure apparatus to produce a nitrogen gas pressure of 330 MPa. 48 The use of high oxygen pressure produced by a decomposition of metal peroxides in a high-pressure capsule has been well established, rather than nitrogen gas, and novel perovskite oxides consisting of an abnormally high valence transition metal, such as Fe 4+ , have been successfully synthesized. 49 High-pressure synthesis has been applied to the formation of many types of compounds.…”