BI-IN SİSTEMİNDE ELEKTRİKSEL VE ISIL İLETKENLİK VE ISIL İLETKENLİĞE FONON KATKISI

Öz

Bu çalışmada, elektriksel ve ısıl iletkenlik ölçümleri kullanılarak ısısal iletkenliğe fonon katkısı kompozisyon değişimine bağlı olarak belirlenmiştir. In-Bi sistemlerinin birçok teknolojik uygulamalarda yaygın olarak kullanılması sebebiyle farklı kompozisyonlardaki Bi bileşimlerinin sıcaklığa bağlı elektriksel ve ısıl iletkenlik değişimleri ölçülmüştür. Elektriksel ve ısıl iletkenlik ölçümlerinde sırasıyla Dört Nokta Prob (FPP) ve Lineer Isı Akışı (LHF) yöntemleri kullanılmıştır. Erime sıcaklığında, intermetalik sistemlerin elektriksel iletkenlik değerleri 0.8524 (1/Ω m) ×106 ve 2.8381(1/Ω m) ×106 arasında ve ısısal iletkenlik değerleri 14.50 (W/Km) ve 35.93 (W/Km) arasında bulunmuştur. Ölçülen değerlerle, Wiedemann-Franz Kanunu (WFL) kullanılarak, ısıl iletkenliğe elektron ve fonon katkısı hesaplanmıştır. İntermetalik alaşım sistemleri için, elektriksel ve ısıl değerlerin sıcaklık katsayıları () sırasıyla 0.46-2.54(K-1) x10-3 ve 1.29-4.34 (K-1)x10-3 aralığında hesaplanmıştır. Bi-In İntermetalik alaşım sistemlerinin mikroyapılarını gözlemlemek için Taramalı Elektron Mikroskobu (SEM) ve yapılardaki fazların kompozisyonlarını belirlemek için, Enerji Dağıtıcı X-Işını (EDX) analizi kullanılmıştır. Bi-In alaşım sistemlerindeki erime sıcaklıkları (349.03 K-387.24 K), füzyon entalpisi (17.97 J/g- 42.37 J/g) ve spesifik ısı değişimi (0.159 J/gK-0.372 J/gK) Diferansiyel Taramalı Kalorimetre (DSC) ile ölçülmüştür.

Anahtar Kelimeler

• Mikroyapı
• Elektriksel özellikler
• Isıl özellikler

ELECTRICAL AND THERMAL CONDUCTIVITY AND PHONON CONTRIBUTION TO THE THERMAL CONDUCTIVITY IN THE BI-IN SYSTEM

Öz

In this study, the contribution of phonon to the thermal conductivity in the In-Bi (Indium-Bismuth) system due to its composition variation was determined from their electrical and thermal conductivity measurements. Because of the common usage of In-Bi system in many technological applications, thermal and electrical conductivity variations with temperature for different compositions of Bi component were measured. Four-Point Probe (FPP) and Linear Heat-Flow (LHF) methods were used for electrical and thermal conductivity measurements respectively. Intermetallic systems' electrical conductivity values were determined between 0.8524 (1/Ω m) ×106 and 2.8381(1/Ω m) ×106 and thermal conductivity values were found between 14.50 (W/Km) and 35.93 (W/Km) at the melting temperature. Electron and phonon contributions to the thermal conductivity were calculated by using Wiedemann-Franz Law (WFL) from the measured values. The temperature coefficients values () of electrical and thermal conductivity were calculated between 0.46-2.54 (K-1) x10-3 and 1.29-4.34 (K-1) x10-3 respectively. In order to observe microstructure of the Bi-In intermetallic alloy Scanning Electron Microscopy (SEM) and to determine the composition of the phases in the structures, Energy Dispersive X-Ray Analysis (EDX) were used. Also melting temperatures (349.03 K-387.24 K), enthalpy of fusion (17.97 J/g- 42.37 J/g) and specific heat change (0.159 J/gK-0.372 J/gK) of Bi-In alloy systems were measured by using Differential Scanning Calorimeter (DSC).

Anahtar Kelimeler

• Microstructure
• Electrical properties
• Thermal properties

Kaynakça

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