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| - Magnetic behaviour of $x\textmd{Nd}_2\textmd{O}_3(1-x)[0.95\textmd{Na}_2\textmd{B}_4\textmd{O}_7 \cdot 0.05\textmd{PbO}]$ glasses
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| - Glasses of the $x\ab{Nd}_2\ab{O}_3(1-x)$$[0.95\ab{Na}_2\ab{B}_4\ab{O}_7\cdot 0.05\ab{PbO}]$ system with $0.01 \le x \le 0.25$ were studied using magnetic susceptibility measurements. The magnetic behaviour of these glasses is due to the presence of $\ab{Nd}^{3+}$ ions in the glass matrix. For the $x\ab{Nd}_2\ab{O}_3\cdot (1-x)\ab{Na}_2\ab{B}_4\ab{O}_7$ glasses with $x \le 0.05$ the magnetic neodymium ions appear as isolated species. For higher x values these glasses present a mictomagnetic-type magnetic behaviour and both isolated and antiferromagnetically coupled pairs appear in the host glass matrix.
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