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Thermal effusivity measurements of thermal insulators using the photopyroelectric technique in the front configuration
(Elsevier, 2018-03-21)
In the photopyroelectric (PPE) technique in the front configuration one surface of a pyroelectric sensor is illuminated by a modulated laser beam, whereas the other surface is in contact with the sample under study. A ...
119Sn Mössbauer Spectroscopy for assessing the local stress and defect state towards the tuning of Ni-Mn-Sn alloys
(AIP, 2017-05-02)
[EN] The influence of defects and local stresses on the magnetic properties and martensitic transformation in Ni50Mn35Sn15 is studied at macroscopic and atomic scale levels. We show that both the structural and magnetic ...
Identification of Ni-vacancy defect in Ni-Mn-Z (Z = Ga, Sn, In): An experimental and DFT positron annihilation study
(APS, 2019-02-21)
[EN] By means of experimental positron-annihilation-lifetime measurements and theoretical density functional theory (DFT) positron-lifetime calculations, vacancy-type defects in Ni50Mn50−xSnx (x=25, 20,15,13,10) and ...
Observation of a charge delocalization from Se vacancies in Bi2Se3: A positron annihilation study of native defects
(APS, 2016-07-27)
[EN] By means of positron annihilation lifetime spectroscopy, we have investigated the native defects present in Bi2Se3, which belongs to the family of topological insulators. We experimentally demonstrate that selenium ...
Experimental observation of vacancy assisted martensitic transformation shift in Ni-Fe-Ga alloys
(APS, 2019-04-23)
[EN] Positron annihilation lifetime spectroscopy is used to experimentally demonstrate the direct relationship between vacancies and the shift of the martensitic transformation temperature in a Ni55Fe17Ga28 alloy. The ...
Low temperature magnetic properties of a Ni50Mn34In16 ball-milled metamagnetic shape memory alloy
(Elsevier, 2016-09-01)
[EN] The effect of the atomic disorder induced by ball-milling on the structure and the magnetic properties has been analyzed in a Ni50Mn34In16 metamagnetic shape memory alloy. The as-milled samples displayed an amorphous ...
Mechanically induced disorder and crystallization process in Ni-Mn-In ball-milled alloys
(Elsevier, 2016-12-25)
[EN] High mechanical deformation has been induced in a Ni-Mn-In metamagnetic shape memory alloy by means of ball milling. The evolution of both the martensitic transformation and the magnetic properties associated to the ...
Retrieving the thermal diffusivity and effusivity of solids from the same frequency scan using the front photopyroelectric technique
(IOP Science, 2017-09-14)
The photopyroelectric (PPE) technique in the front configuration consists in illuminating one
surface of a pyroelectric slab while the other surface is in contact with the test sample. This
method has been widely used ...
Measuring the thermal resistance of vertical interfaces separating two different media using infrared thermography
(Elsevier, 2019)
We propose a method to measure the thermal contact resistance at the vertical interface between two materials using lock-in infrared thermography with laser spot heating. We found an analytical expression for the surface ...
Comprehensive study of the magnetic phase transitions in Tb3Co combining thermal, magnetic and neutron diffraction measurements
(Elsevier, 2019-05-22)
A comprehensive study of the magnetic phase transitions in Tb3Co has been undertaken combining different techniques. Using single crystal neutron diffraction in the paramagnetic state a weak crystal structure distortion ...