メタタングステン酸アンモニウムの結晶構造は、通常、X線回折（XRD）を使用して分析されます。装置がX線を試料に照射し、回折パターンに基づいて結晶型と純度を判断します：
• AMTの特徴的なピークは2θ = 10°～30°の範囲に現れ、単斜晶系の特性を示します。
• APTやWO₃の不純物が混在する場合、追加の回折ピークが現れ、試料の純度が不足していることを示します。
走査型電子顕微鏡（SEM）も結晶形態を観察するために使用でき、粒子の均一性を確認します。通常、AMTは針状または板状の結晶を示します。
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