As2Te3-TlSe Sistemindeki Etkileşimin Karakteri ve Elde Edilen Fazların Elektrofiziksel Özellikleri

As2Te3-TlSe sistemindeki etkileşimin karakteri, Diferansiyel Termal Analiz (DTA), X-ışını Kırınım (XRD), Mikroyapı analizi (MCA) yöntemleri ile ve ayrıca mikrosertlik ölçülerek ve alaşımların yoğunluğu belirlenerek incelenmiştir ve durum diyagramı oluşturulmuştur. As2Te3-TlSe faz diyagramı As, Tl // Se, Te üçlü karşılıklı systemin kuvazi binar kesiti olduğu tespit edilmiştir. As2Te3-TlSe sisteminde iki yeni bileşik, TlAs2Te3Se ve Tl3As2Se3Te3 oluşturulmuştur. Her iki bileşik de camsı halde elde edilir. Oda sıcaklığında As2Te3 bileşiğine dayalı katı çözelti alanı 3 mol. % TlSe ve TlSe bileşiğine dayalı katı çözelti alanı ise 2 mol. % As2Te3 olarak belirlenmiştir. (As2Te3)1-x (TlSe)x katı çözeltilerinin elektrik iletkenliği ve termoelektrik gücü, sıcaklığın fonksiyonu olarak ölçülmüştür.

Anahtar Kelimeler:

Alaşımlar, bileşik, kongruent, termoelektrik

Character of the interaction in the As2Te3-TISe System and Electrophysical Propertes of the Phases Obtained

The character of the interaction in the As2Te3-TlSe system was studied by the methods of Differential Thermal Analysis (DTA), X-ray Diffraction (XRD), Microstructure analysis (MCA), and also by measuring the microhardness and determining the density of alloys, and state diagram was constructed. It is established that the As2Te3-TlSe state diagram is a quasibinary section of the triple mutual system As, Tl // Se, Te. Two new compounds, TlAs2Te3Se and Tl3As2Se3Te3, are formed in the As2Te3-TlSe system. Both compounds are obtained in the vitreous state. Solid solutions based on As2Te3 at room temperature reach up to 3 mol.% TlSe, and based on TlSe-2 mol.% As2Te3. The electrical conductivity and thermoelectric power coefficient of the (As2Te3)1-x (TlSe)x solid solutions have been measured as functions of temperature.

Keywords:

Alloys, compound, congruently, thermoelectric,

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