Low-temperature thermo-transport and magnetic properties of HfNiGe alloy
XYZ-type intermetallic compounds exhibit a wide range of intriguing thermophysical properties. Here, we explore the low-temperature thermotransport behavior of a TiNiSi-type intermetallic alloy HfNiGe. The compound was synthesized using a high-temperature arc melting technique from high-purity eleme...
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IOP Publishing
2025-01-01
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| Online Access: | https://doi.org/10.1088/2053-1591/add66b |
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| author | Md Mofasser Mallick Satish Vitta |
| author_facet | Md Mofasser Mallick Satish Vitta |
| author_sort | Md Mofasser Mallick |
| collection | DOAJ |
| description | XYZ-type intermetallic compounds exhibit a wide range of intriguing thermophysical properties. Here, we explore the low-temperature thermotransport behavior of a TiNiSi-type intermetallic alloy HfNiGe. The compound was synthesized using a high-temperature arc melting technique from high-purity elements, followed by annealing, pulverizing, and hot-pressing. The x-ray diffraction analysis reveals the presence of an orthorhombic phase belonging to space group pnma. The compound exhibits low electrical resistivity ( ρ ), increasing from 1 mΩ·cm to 2.5 mΩ·cm with temperature, characteristic of metallic behavior. The thermopower ( α ) values indicate an n-type system. It increases with temperature up to 150 K, reaching a maximum of ∼ −11 μV·K ^−1 , before declining. The power factor ( α ^2 / ρ ) attains its highest value of ∼8 μW·m ^−1 ·K ^−2 at 186 K, while the maximum figure-of-merit (zT) of ∼5 × 10 ^−4 is observed at 207 K. Magnetic measurements suggest the presence of short-range ferromagnetic interactions with relatively high coercivity at room temperature. The temperature-dependent magnetic susceptibility ( χ ), measured under an external field of 50 Oe to 5 kOe, indicates Pauli paramagnetism along with the presence of paramagnetic impurities. |
| format | Article |
| id | doaj-art-b1c998c40e1340628e3b3f90db84b1c1 |
| institution | Kabale University |
| issn | 2053-1591 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
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| series | Materials Research Express |
| spelling | doaj-art-b1c998c40e1340628e3b3f90db84b1c12025-08-20T03:47:28ZengIOP PublishingMaterials Research Express2053-15912025-01-0112505630310.1088/2053-1591/add66bLow-temperature thermo-transport and magnetic properties of HfNiGe alloyMd Mofasser Mallick0https://orcid.org/0000-0003-2105-6153Satish Vitta1https://orcid.org/0000-0003-4138-0022Light Technology Institute, Karlsruhe Institute of Technology (KIT) , 76131, Karlsruhe, GermanyDepartment of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay , Mumbai, 400076, IndiaXYZ-type intermetallic compounds exhibit a wide range of intriguing thermophysical properties. Here, we explore the low-temperature thermotransport behavior of a TiNiSi-type intermetallic alloy HfNiGe. The compound was synthesized using a high-temperature arc melting technique from high-purity elements, followed by annealing, pulverizing, and hot-pressing. The x-ray diffraction analysis reveals the presence of an orthorhombic phase belonging to space group pnma. The compound exhibits low electrical resistivity ( ρ ), increasing from 1 mΩ·cm to 2.5 mΩ·cm with temperature, characteristic of metallic behavior. The thermopower ( α ) values indicate an n-type system. It increases with temperature up to 150 K, reaching a maximum of ∼ −11 μV·K ^−1 , before declining. The power factor ( α ^2 / ρ ) attains its highest value of ∼8 μW·m ^−1 ·K ^−2 at 186 K, while the maximum figure-of-merit (zT) of ∼5 × 10 ^−4 is observed at 207 K. Magnetic measurements suggest the presence of short-range ferromagnetic interactions with relatively high coercivity at room temperature. The temperature-dependent magnetic susceptibility ( χ ), measured under an external field of 50 Oe to 5 kOe, indicates Pauli paramagnetism along with the presence of paramagnetic impurities.https://doi.org/10.1088/2053-1591/add66bintermetallic alloythermoelectricmagnetichalf-heusler |
| spellingShingle | Md Mofasser Mallick Satish Vitta Low-temperature thermo-transport and magnetic properties of HfNiGe alloy Materials Research Express intermetallic alloy thermoelectric magnetic half-heusler |
| title | Low-temperature thermo-transport and magnetic properties of HfNiGe alloy |
| title_full | Low-temperature thermo-transport and magnetic properties of HfNiGe alloy |
| title_fullStr | Low-temperature thermo-transport and magnetic properties of HfNiGe alloy |
| title_full_unstemmed | Low-temperature thermo-transport and magnetic properties of HfNiGe alloy |
| title_short | Low-temperature thermo-transport and magnetic properties of HfNiGe alloy |
| title_sort | low temperature thermo transport and magnetic properties of hfnige alloy |
| topic | intermetallic alloy thermoelectric magnetic half-heusler |
| url | https://doi.org/10.1088/2053-1591/add66b |
| work_keys_str_mv | AT mdmofassermallick lowtemperaturethermotransportandmagneticpropertiesofhfnigealloy AT satishvitta lowtemperaturethermotransportandmagneticpropertiesofhfnigealloy |