شبه فلز

أشباه الفلزات (الأصل الإغريقي للكلمة يعنى شبيه الفلز) مثل الفلزات واللافلزات هي إحدى السلاسل الكيميائية، وتتميز بخصائص معينة من ناحية التأين والترابط. تتميز أشباه الفلزات بخصائص متوسطة بين الفلزات واللا فلزات، ولا توجد طريقة محددة للتفريق بين أشباه الفلزات والفلزات الحقيقية، ولكنها عمومًا تكون شبه موصلة أكثر من كونها عازلة.

تقع أشباه الفلزات في الجدول الدوري على هيئة خط مائل من البورون إلى البولونيوم وتكون العناصر الموجودة في أعلى يسار الخط هي الفلزات، بينما تقع العناصر الموجودة أسفل يمين الخط ضمن اللافلزات.

لا تقتصر أشباه الفلزات فقط على هذه العناصر ولكنها توجد أيضًا في السبائك والمركبات.

 التعريفات 

 التعريف القائم على الحكم 
المادة الفوقية هي عنصر له خصائص في الوسط، أو خليط من المعادن واللافلزات، والتي يصعب تصنيفها إما كمعدن أو مادة غير معدنية. يعتمد هذا التعريف عام على الصفات الفاصلة التي يتم الاستشهاد بها باستمرار في المؤلفات العلمية. تُعتبر صعوبة التصنيف سمة رئيسية في تلك الموادّ. تحتوي معظم العناصر على مزيج من الخواص المعدنية وغير المعدنية،شبه فلز ويمكن تصنيفها وفقًا لمجموعة الخصائص التي تكون أكثر وضوحًا. تفتقر العناصر الموجودة في الهوامش أو بالقرب منها إلى غموض واضح بدرجة كافية لتحديد خصائصها المعدنية أو غير المعدنية، وتُصنف على أنها أشباه فلزات.

يتم التعرف على البورون والسيليكون والجرمانيوم والزرنيخ والإثمد والتيلوريوم بشكل شائع كأشباه فلزات.شبه فلز; شبه فلز; شبه فلز يُضاف في بعض الأحيان واحدٌ أو أكثر من السيلنيوم أو البولونيوم أو الأستاتين إلى القائمة باختلاف العالم المؤلف للمرجع العلمي. قد يُستبعد البورون في بعض الأحيان بمفرده في أو يُستبعد معه السيليكون.شبه فلز; شبه فلز لا يُعتبر التيلوريوم ضمن قائمة أشباه الفلزات في بعض الأحيان أيضًا. كما تم التشكيك في إدراج الأنتيمون، والبولونيوم، والأستاتين ضمن أشباه الفلزانالميتالويدات.

يتم تصنيف العناصر الأخرى في بعض الأحيان على أنها أشباه فلزات. تشمل هذه العناصرشبه فلز. Dunstan lists Be, Al, Ge (maybe), As, Se (maybe), Sn, Sb, Te, Pb, Bi, and Po as metalloids (pp. 310, 323, 409, 419). الهيدروجين، والبريليوم، والنيتروجين، والفسفور، والكبريت، والزنك، والغاليوم، والقصدير، واليود، والرصاص، والبزموت، والرادون. كما يُستخدم مصطلح أشباه الفلزات للعناصر التي تُظهر بريق معدني وموصلية كهربائية، وهي العناصر المترددة، مثل الزرنيخ والأنتيمون والفاناديوم والكروم والموليبدنوم والتنغستن والقصدير والرصاص والألمنيوم. تُعتبر الفلزات بعد الانتقالية (مثل الكربون أو النيتروجين) التي يمكن أن تشكل سبائك بالمعادن أو تُعدّل خصائصها في بعض الأحيان كأنواع من أشباه الفلزات.

 التعريف القائم على المعايير 
لا يوجد تعريف مقبول على نطاق واسع لأشباه الفلزات، ولا يوجد أي تقسيم للجدول الدوري إلى المعادن والفلزات واللافلزات؛ تساءل هوكس عن جدوى وضع تعريف محدد، مشيرًا إلى أنه يمكن العثور على حالات شاذة في عدة محاولات. ووصفت شارب تصنيف عنصر على أنه شيء «تعسفي».

تعتمد خصائص أشباه الفلزات على معايير التصنيف المستخدمة. اعترف ايمسلي بأربعة أنواع من أشباه الفلزات (الجرمانيوم والزرنيخ والأنتيمون والتيلوريوم)، وصنّف جيمس وآخرون اثنا عشر عنصرًا (الأربعة الذين اعترف بهم ايمسلي بالإضافة إلى البورون، والكربون، والسيليكون، والسيلينيوم، والبزموت، والبولونيوم، والموسكوفيوم والليفرموريوم. يتم تضمين سبعة عناصر في المتوسط ضمن هذه القوائم؛ كما تميل ترتيبات التصنيف الفردية إلى مشاركة أرضية مشتركة وتختلف في الهوامش غير المحددة.شبه فلز "The boundary between metals and metalloids is indefinite ..."; شبه فلز: "Although the elements are conveniently described as metals, metalloids, and nonmetals, the transitions are not exact ..."

يشيع استخدام معيار كمي واحد مثل الكهرسلبية، تتمتع أشباه الفلزات بقيم كهرومغناطيسية تتراوح من 1.8 أو 1.9 إلى 2.2. تشمل الأمثلة الأخرى كفاءة التعبئة (جزء الحجم في البنية البلورية التي تشغلها الذرات) ومعيار نسبة جولدهامر-هيرتسفيلد. تحتوي أشباه الفلزات المعروفة بشكل عام على كفاءة التعبئة تتراوح بين 34٪ و 41٪. وتساوي نسبة جولدهامر-هرتسفيلد تقريبًا مكعب نصف القطر الذري مقسومًا على الحجم المولي، وتُعتبر مقياس بسيط لكيفية وجود عنصر معدني، وتتمتع أشباه الفلزات الُمعترف بها وجود نسب من حوالي 0.85 إلى 1.1 ومتوسط 1.0. اعتمد المؤلفون الآخرون عل معايير أخرى مثل السلوك الذري أو العدد التناسقي.شبه فلز: "One criterion for distinguishing semi-metals from true metals under normal conditions is that the عدد تناسقي of the former is never greater than eight, while for metals it is usually twelve (or more, if for the body-centred cubic structure one counts next-nearest neighbours as well)."

كتب جونز عن دور التصنيف في العلوم، ولاحظ أن «(التصانيف) عادةً ما يتم تحديدها بأكثر من سمتين». استخدم ماسترتون وسولينسكيشبه فلز list B, Si, Ge, As, Sb and Te as metalloids, and comment that Po and At are ordinarily classified as metalloids but add that this is arbitrary as so little is known about them. ثلاثة معايير لوصف العناصر الستة المعترف بها بشكل شائع كأشباه للفلزات: فأشباه الفلزات لها طاقات تأين تساوي حوالي 200 كيلوكالوري / مول (837 كيلوجول / مول) وقيم تيار كهربية قريبة من 2.0. كما قالوا أن أشباه الفلزات تُعتبر أشباه موصلات بشكل نموذجي، على الرغم من أن الأنتيمون والزرنيخ (شبه الجسيم من منظور فيزياء) لهما توصيلات كهربائية تقترب من المعادن. ويُعتقد في أن السلينيوم والبولونيوم لا يندرجا في هذا التصنيف، في حين تظل حالة الأستاتين غير مؤكدة.

 الاستخدامات الشائعة 
تكون أشباه الفلزات هشة للغاية بحيث لا توجد استخدامات هيكلية لها في أشكالها النقية. وتستخدم هذه المركبات ومكوناتها كمكونات للسبائك، والعوامل البيولوجية (المٌبيدة والغذائية والطبية)، والمُحفزات، ومثبطات اللهب، والنظارات، ووسائط التخزين البصرية والإلكترونيات البصرية، والألعاب النارية، وأشباه الموصلات والإلكترونيات.

 السبائك 
بديل=Several dozen metallic pellets, reddish-brown. They have a highly polished appearance, as if they had a cellophane coating.|تصغير|عندما تمتزج سبائك النحاس والجرمانيوم، بنسب على الأرجح تٌفارب 84 ٪ النحاس و16 ٪ جرمانيوم  بالفضة، تكون النتيجة نشوء الفضة الإسترليني المقاومة للتأكل.

لاحظ عالم المعادن البريطاني سيسيل ديش في كتابة في وقت مبكر من تاريخ المركبات بين الفلزية، أن «بعض العناصر غير المعدنية قادرة على تشكيل مركبات ذات طبيعة معدنية مميزة بالمعادن، وبالتالي قد تدخل هذه العناصر في تكوين السبائك». ارتبط السيليكون والزرنيخ والتيلوريوم، على وجه الخصوص، مع العناصر المكونة للسبيكة. اقترح فيليبس وويليامز أن مركبات السيليكون والجرمانيوم والزرنيخ والأنتيمون مع الفلزات بعد الانتقالية «من المحتمل أن تصنف على أنها سبائك».

ومن بين المركبات الفلزّية الخفيفة، تكون السبائك التي تحتوي على فلزات انتقالية ممثلة تمثيلاً جيدًا. يمكن أن يشكل البورون مركبات السبائك وسبائك مع هذه المعادن، إذا كانت n> 2. يستخدم الفيروبورن (المُحتوي على 15 ٪ من البورون) لإدخال البورون إلى سبائك الصلب؛ وتدخل سبائك النيكل والبورون في مكونات سبائك اللحام وتركيبات الصناعات الهندسية. تستخدم سبائك السيليكون مع الحديد والألومنيوم على نطاق واسع في صناعات الصلب والسيارات، على التوالي. كما يشكل الجرمانيوم العديد من السبائك، وتُعتبر سبائكه مع عناصر المجموعة الحادية عشرة الأكثر أهمية.

تستخدم أشباه الفلزات الأثقل في صُنع السبائك أيضًا. يمكن للزرنيخ أن يشكل سبائك مع المعادن، بما في ذلك البلاتين والنحاس؛ كما يُضاف إلى النحاس وسبائكه لتحسين مقاومة التآكل ويبدو أنه يمنح نفس الفائدة عند إضافته إلى الماغنيسيوم. يشتهر الإثمد بأنه سبيكة ممتازة في الصناعات، بما في ذلك مع معادن العملات. وتشتمل سبائكه على البيوتر (بيوتر) (وهي سبيكة من القصدير مع ما يصل إلى 20٪ من الإثمد) ونوع معدني (سبيكة رصاص بها ما يصل إلى 25٪ من الإثمد). يُشكل التيلوريوم بسهولة سبائك مع الحديد، مثل سبائك القيروتيليريوم (تحتوي على 50-58 ٪ التيلوريوم)، والنحاس، في شكل سبائك التيلوريوم النحاس (تحتوي على 40-50 ٪ التيلوريوم). يستخدم الفيروتيليريوم كمثبت للكربون في صب الصلب. من العناصر غير المعدنية التي غالبًا ما يتم التعرف عليها غالبًا على أنها من مركبات أشباه الفلزات، يُستخدم السيلينيوم في شكل الفيروزيلنيوم (50-58٪ من السيلينيوم) - لتحسين قابلية استخدام الصلب المقاوم للصدأ.

 انظر أيضًا 
 عنصر كيميائي
 جدل حول تسمية العناصر
 مجموعة (جدول دوري)
 التسمية النظامية للمركبات العضوية
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 لمزيد من القراءة 
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