Details

Autor(en) / Beteiligte

• Music, Denis
• Chen, Yen-Ting
• Bliem, Pascal
• Geyer, Richard W

Titel

Amorphous-crystalline transition in thermoelectric NbO sub(2)

Ist Teil von

• Journal of physics. D, Applied physics, 2015-07, Vol.48 (27), p.1-7

Erscheinungsjahr

2015

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Density functional theory was employed to design enhanced amorphous NbO sub(2) thermoelectrics. The covalent-ionic nature of Nb-O bonding is identical in amorphous NbO sub(2) and its crystalline counterpart. However, the Anderson localisation occurs in amorphous NbO sub(2), which may affect the transport properties. We calculate a multifold increase in the absolute Seebeck coefficient for the amorphous state. These predictions were critically appraised by measuring the Seebeck coefficient of sputtered amorphous and crystalline NbO sub(2) thin films with the identical short-range order. The first-order phase transition occurs at approximately 550 [degrees]C, but amorphous NbO sub(2) possesses enhanced transport properties at all temperatures. Amorphous NbO sub(2), reaching - 173 mu VK super(-1), exhibits up to a 29% larger absolute Seebeck coefficient value, thereby validating the predictions.