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تلوریم

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تلوریم

( Tellurium)
نام: تلوریم، تلور
نماد:Te
عدد اتمی:52
عدد جرمی:127
جرم اتمی استاندارد: 127.6 gr/mol
آرایش االکترونی:5s²4d10 5p⁴[Kr]
چگالی:6.24gr/cm³
دمای ذوب:°449 C
دمای جوش:°988 C
 شبه فلزی براق و سمی است. شباهت زیادی به سلنیوم دارد.
بوی آن شبیه سیر است. و در بین اسید ها فقط با اسید سولفوریک و اسید نیتریک واکنش می دهد.
در سال ۱۷۸۲ رایش اشتاین بازرس معادن تراسیلوانیا از یک کانی ِ طلا ماده‌ای استخراج کرد که شبیه آنتیموان بود. برگمان که این کانی را آزمایش کرد ثابت کرد که این ماده انتیموان نیست لیکن با مقداری از این ماده که در اختیار داشت، نتوانست چیز بیشتری درباره این عنصر به ظاهر جدید کشف کند. به سال ۱۷۸۹ کیتابل نیز این عنصر را کشف کرد به سال ۱۸۹۸ کلاپروت به این کشف‌ها توجه کرد و وجود این عنصر را تایید و آن را نامگذاری کرد
نام تلوریوم از نام لاتین تلوس، تلوریس به معنی زمین گرفته شده‌است
تنفس آن سمی است و کمی نیز خورنده است.
کاربرد
آلیاژ ها؛ عامل سخت کننده ثانوی لاستیک؛ تولید آهن و فولاد ضد زنگ ریختگی؛ عامل رنگ کننده در سرامیک و شیشه؛ دستگاه‌های ترموالکتریک؛ کاتالیزور؛ باتری‌های ذخیره در سفینه‌ها
تلوریم گاهی اوقات به شکل خالص یافت می‌شود، اما اغلب بصورت تلورید طلا (کالاوریت) و در ترکیب با سایر فلزات دیده می‌شود. منبع اصلی تلوریم رسوبات آند است که در خلال تصفیه الکترولیزی مس جوشدار بوجود می‌آید.
. قیمت هر پوند تلوریم در سال 2000 معادل 14 دلار آمریکا بود.
ا
برای تلوریم 30 ایزوتوپ با جرمهای اتمی بین 108 تا 137 شناسایی شده است. تلوریم طبیعی دارای 8 ایزوتوپ است.

تلوریم

تلوریم


 

امیرمحمدمحمدحسینی
اشتراک گذاریShare on FacebookBuffer this pageTweet about this on TwitterPrint this pageShare on TumblrShare on RedditShare on StumbleUponDigg thisFlattr the authorShare on LinkedInPin on PinterestEmail this to someoneShare on YummlyShare on VKShare on Google+

‏182 دیدگاه در نوشته‌ی “تلوریم

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