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Sự phân bố lại cation do nhiệt trong fluor-elbaite và tourmaline chứa Fe
Tóm tắt
Một loại fluor-elbaite giàu Fe đã được xử lý nhiệt trong không khí và môi trường hydrogen lên tới 800 °C để nghiên cứu những thay đổi tiềm năng trong trật tự Fe và Al tại các vị trí Y và Z được phối hợp với octahedron. Nhìn chung, dữ liệu thực nghiệm (cải tiến cấu trúc, vi phân tử electron và ion, Mössbauer, quang phổ hấp thụ hồng ngoại và quang học) cho thấy rằng xử lý nhiệt fluor-elbaite dẫn đến sự tăng trưởng của hàm lượng Fe tại vị trí Z được cân bằng bởi một sự gia tăng Al tại vị trí Y. Dựa trên nghiên cứu này và các nghiên cứu thực nghiệm trước đó về tourmaline chứa Fe–Mg–Al, có thể khẳng định rằng tỷ lệ trao đổi Fe–Mg–Al giữa các vị trí là đáng kể ở nhiệt độ khoảng 700–800 °C. Xử lý nhiệt dẫn đến sự gia tăng khoảng 0.30 nguyên tử Fe mỗi đơn vị công thức tại vị trí Z, được bù đắp bởi sự gia tăng tương tự của (Mg + Al) tại vị trí Y, theo phương trình trao đổi YFe + Z(Mg + Al) → ZFe + Y(Mg + Al). Vì tên gọi của tourmaline dựa trên sự chiếm đóng của các ion tại mỗi vị trí cấu trúc, sự sắp xếp Fe–Mg–Al giữa các vị trí có thể xác định loài tourmaline. Điều này có nghĩa là cách gọi liên quan đến một thành phần nhất định có thể là một chức năng của lịch sử nhiệt của mẫu.
Từ khóa
#fluor-elbaite #tourmaline #phân bố cation #xử lý nhiệt #Fe–Mg–Al trao đổiTài liệu tham khảo
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