メタタングステン酸アンモニウム（AMT）は、熱分解により高純度の三酸化タングステン（WO₃）を直接生産できます。プロセスは以下の通りです：
- AMTを酸化雰囲気下で300～500℃に加熱し、WO₃、アンモニア（NH₃）、および水蒸気（H₂O）に分解します。
- 生成したWO₃を回収し、必要に応じて結晶性を高めるためにさらに焼成します。
WO₃は、電気変色材料（例：スマートウィンドウ）やガスセンサー（例：NO₂検出）の主要成分です。AMTの利点は、分解生成物の純度が高く、不純物が少ないため、エレクトロニクス業界の要求に応えます。一方、アンモニウムパラタングステン（APT）からWO₃を生産するにはより高い温度（700～800℃）が必要で、追加の工程が必要になる場合があります。
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