Abstract
Electrical resistivity of two-phase products [yEuZrO 3 + (1 − y) EuNbO 3] increased continuously with y, and a transition from a metallic to semiconducting characteristic occured at y = 0.14. The resistivity varied almost linearly with temperaure in the range y = 0 to y = 0.24, and thermal coefficients of resistivity at 300 K for the products decreased from +5.9 × 10 −4 K −1 to −7.4 × 10 −4 K −1 according to the value of y. At y = 0.14, the thermal coefficient was almost zero. Thermal coefficients of electrical resistivity for the niobates with various oxygen contents were all positive in the range 2.55 < O Nb < 3.24 and exhibited a sharp minimum at O Nb = 2.92 . In all these niobates, Eu xNbO 3 was a major phase and Eu 3NbO 6 or EuNbO 2 was detected as a second phase in the range O Nb > 3 or O Nb < 3 respectively. Peaks in the resistivity curves were correlated with a magnetic ordering temperature for samples with an overall ratio O Nb > 3 .
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
