MINERAL COMPOSITION EVALUATION METHOD

• Main Authors: ITAYA YUKI, KUNINISHI TAKESHI, HAYASHI SHINTARO
• Format: Patent
• Language: English; Japanese
• Published: 17.11.2016
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

PROBLEM TO BE SOLVED: To provide a novel method of evaluating mineral composition, which allows for evaluating composition of minerals such as dolomite, whose composition is altered by thermal decomposition, in terms of local structural changes of, for example, a surface layer, bulk, and the like and not in terms of overall change in mineral composition, which enables detailed analysis of compositional changes of minerals when used in parallel with the XRD method.SOLUTION: A method of evaluating composition of a mineral whose composition is altered by thermal decomposition involves; heating the mineral; irradiating the mineral with XAFS measurement X-rays while sweeping the wavelength to acquire a first XAFS spectral pattern during a first specific period; irradiating the mineral with the XAFS measurement X-rays while sweeping the wavelength to acquire a second XAFS spectral pattern during a second specific period different from the first specific period; and comparing the first XAFS spectral pattern and the second XAFS spectral pattern to evaluate composition of local structures of the mineral with respect to a specific compound contained in the mineral.SELECTED DRAWING: None 【課題】熱分解により組成が変化する、ドロマイトのような鉱物の組成を、全体の鉱物組成の変化ではなく、局所的な構造変化、例えば表層やバルク等においても評価して、ＸＲＤと並列して用いて、鉱物の組成の変化が詳細に解析することができる、新規な鉱物の組成評価方法を提供する。【解決手段】熱分解により組成が変化する鉱物の組成を評価する方法であって、該鉱物を加熱しながら、第１の特定時間において、ＸＡＦＳ測定によるＸ線を波長掃引しながら該鉱物に照射して、第１のＸＡＦＳスペクトルパターンを取得し、第１の特定時間と異なる第２の特定時間において、ＸＡＦＳ測定によるＸ線を波長掃引しながら該鉱物に照射して、第２のＸＡＦＳスペクトルパターンを取得し、第１のＸＡＦＳスペクトルパターンと第２のＸＡＦＳスペクトルパターンとを比較して、該鉱物に含まれる特定の化合物に関し、該鉱物における局所構造の組成を評価する。【選択図】なし