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Updated: Aug 5, 2026

Ammonia Synthesis at Low Pressure
Published on: August 23, 2017
Ammonia-Mediated Bulk Synthesis of Layered Nitride Materials
Masashi Tanaka1, Takuma Hirao1
1Graduate School of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan.
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Ammonia provides a versatile platform for the synthesis and chemical modification of layered nitride materials. Among these, layered nitride halides of the MNX family have attracted considerable attention because of their superconductivity upon electron doping and their rich structural chemistry. Many of these compounds, including both α- and β-type phases, are synthesised via ammonia-mediated reactions, highlighting the central role of NH3 chemistry in this class of materials. In this review, we summarise ammonia-mediated synthesis routes and reaction environments for layered nitride halides and related nitride materials, with particular emphasis on bulk synthesis strategies. As a case study, we discuss the synthesis and electron-doped superconductivity of TiNI, a less explored member of the MNX family. We further highlight recent developments in ammonia-driven reactions that enable the formation and modification of nitride phases, including nitrogen-rich ZrN derived from layered precursors while retaining their morphological features. These examples demonstrate that ammonia-mediated processes provide a unified platform for controlling structure, composition, and electronic states across a wide range of reaction conditions.
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