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پرازئودیمیم

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پرازئودیمیم

پرازئودیمیم( Praseodymium)
نام: پرازئودیمیم، پروزئودیمیم
نماد:Pr
عدد اتمی:59
عدد جرمی:140
جرم اتمی:140.90 gr/mol
آرایش الکترونی:[Xe]6s²4f³
چگالی:6.48 gr/cm³
دمای ذوب: °931 C
دمای جوش:°3512 C
فلزی در دسته لانتانید هاست. دارای جلای طلایی فلزی است. دارای خاصیت پارامغناطیس است و توسط آهن ربا های قوی، جذب می شود.
عنصر فلزی با عدد اتمی ۵۹ در گروه IIB و دوره ششم جدول تناوبی جا دارد یکی از عناصر خاکی کمیاب از سری لانتانید است. جرم اتمی ۹۰۷۷/۱۴۰، ظرفیت ۳ و ۴ دارای یک ایزوتوپ پایدار است.خواص: فلز زرد رنگ به آسانی از جلا می‌افتد، جرم حجمی ۷۸/۶ تا ۸۱/۶ نقطه ذوب ۹۳۰c نقطه جوش در حدود ۳۲۰c احتراق آن اکسید می‌دهد (۲۰۰ تا ۴۰۰c) هیدروژن را از آب آزاد می‌کند؛ در اسیدهای رقیق محلول است. پارامغناطیس، غیر سمی
کاربرد: نمک‌های پرازئودیمیم، کاتالیزور، فسفورها، ماده اصلی قوس کربن، رنگ کننده در شیشه.
کاربرد ها
عینک ایمنی جوشکاری و دمنده شیشه که برای محافظت از چشم در برابر نور زرد شعله و اشعه UV مورد استفاده قرار می گیرد، از پرازئودیم و نئودیم ساخته می شود.
کاشی و سرامیک های زرد براق و ظروف غذاخوری که در منطقه مدیترانه معمول است، از ترکیب پرازئودیم و اکسید زیرکونیم به دست می اید.
پراسزئودیم اکسید به عنوان کاتالیزور در ساخت پلاستیک های رایج و پلی اتیلن برای تولید شیشه های نوشیدنی و بسته بندی پلاستیکی غذا و کیسه ساندویچ و بطری شیر استفاده می شود.
دارای یک ایروتوپ پایدار و 2 ایزوتوپ پرتوزا
Pr 142 با نیمه عمر 19 ساعت و Pr 141
با نیمه عمر 14 روز می باشد.

پرازئودیمیم

پرازئودیمیم


 

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