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The thermoelectric figure‐of‐merit (zT) of p‐type MNiSn (M = Ti, Zr, or Hf) half‐Heusler compounds is lower than their n‐type counterparts due to the presence of a donor in‐gap state caused by Ni occupying tetrahedral interstitials. While ZrNiSn and TiNiSn, have been extensively studied, HfNiSn remains unexplored. Herein, this study reports an improved thermoelectric property in p‐type HfNi1−xCoxSn...
Based on the least squares method which is arranged to the problem of fitting theoretical to experimental measured variables, such as phase velocities of acoustic waves and/or resonant frequencies, the environment of the minimum sum of squares (SSQ) has been analyzed, similarly to [1]. This is done by forming a “sensitivity matrix” (or Jacobian matrix: derivatives of measured variables with respect...
It was shown experimentally in [1] that a macroscopic cylindrical solid can be rotated due to the excitation of two counter-propagating surface acoustic waves (SAWs) with different amplitudes on its surface. The arising distributed rotation force has been estimated phenomenologically in the partial case of a piezoelectric tube with a ring unidirectional electrode transducer (RUDT) using the torsion...
It was shown experimentally in [1], [2] that a macroscopic cylindrical solid can be rotated due to the excitation of two counter-propagating surface acoustic waves (SAWs) with different amplitudes on its surface. Arising internal distributed rotation force has been calculated phenomenologically in the partial case of a piezoelectric tube with a ring unidirectional electrode transducer (RUDT) using...
Since the beginning of using piezoelectric single crystals for highly-precise microacoustic components rigorous knowledge of material constant (MC) sets was an indispensable requirement for mastering the subject. The sets have to be both accurate and complete. Accuracy is important for acceptable agreement between device simulation and experimental reality, completeness preferentially plays a role...
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