مشخصه‌یابی عیوب کریستالی مرز دوقلویی در ابررسانای دمابالا YBCO

نوع مقاله: مقاله علمی ترویجی

نویسندگان

1 استادیار، دانشکده علوم پایه، گروه فیزیک مهندسی، دانشگاه صنعتی قم

2 دانشیار، دانشکده فیزیک، دانشگاه کاشان

چکیده

دوقلویی یکی از مکانیسم‌های اصلی تغییر شکل پلاستیکی در کریستال‌ها است که خواص مربوط به آن از مسائل مهم در علم مواد به شمار می‌رود. یکی از مهم‌ترین ویژگی‌های ریزساختاری مشاهده شده در ابررسانای دمابالای YBa2Cu3O7-y ، (YBCO) دوقلویی است که به سبب استحاله فاز تتراگونال به اورتورمبیک رخ می‌دهد. مشکل عمده در کاربردهای صنعتی ابررساناهای دمابالا چگالی جریان بحرانی (Jc) پایین است. مرزهای دوقلویی در YBCO که از نوع نواقص صفحه‌ای می‌باشند، مراکز اصلی میخ‌کوبی شار محسوب می‌شوند که موجب افزایش چگالی جریان بحرانی می‌گردند. بنابراین طراحی ساختارهای دوقلویی YBCO در هنگام تولید برای بهبود خواص الکتریکی، مغناطیسی و جهت بهره‌برداری تجاری آن ضروری می‌باشد. با توجه به تعدد گزارش‌های موجود در این زمینه و نتایج بعضاً متناقض، در این مقاله کلیه نتایج تجربی و نظری منتشرشده در ارتباط با مرزهای دوقلویی و تأثیر آن بر خواص مختلف YBCO مورد بحث و بررسی قرار می‌گیرد.

کلیدواژه‌ها


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