Borides Mn 3-x {Rh,Ir} 5B2 with Ti3Co5B2-type: X-ray single crystal and TEM data, physical properties

被引:0
|
作者
Rogl, Gerda [1 ]
Eiberger, Markus [1 ]
Steiner, Soner [1 ,2 ]
Michor, Herwig [2 ]
Bursik, Jiri [3 ]
Giester, Gerald [4 ]
Grytsiv, Andrij [1 ]
Rogl, Peter F. [1 ]
机构
[1] Univ Vienna, Inst Mat Chem, Wahringerstr 42, A-1090 Vienna, Austria
[2] TU Wien, Inst Solid State Phys, Wiedner Hauptstr 8-10, A-1040 Vienna, Austria
[3] Czech Acad Sci, Inst Phys Mat, Zizkova 22, CZ-61662 Brno, Czech Republic
[4] Univ Vienna, Inst Mineral & Crystallog, Josef-Holaubek-Pl 2, A-1090 Vienna, Austria
关键词
Ternary borides; Crystal structure; TEM; Physical properties; Hardness; SUPERHARD;
D O I
10.1016/j.solidstatesciences.2024.107583
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
A cursory investigation of the phase relations in the Mn-{Rh,Ir}-B systems prompted for each system a ternary compound, Mn 3-x {Rh,Ir} 5 B 2 , the crystal structure of them was determined from X-ray single crystal data to be isotypic with the Ti 3 Co 5 B 2 -type (space group P 4/ mbm , No. 127). In both cases the Mn -site in 2 a at the origin of the unit cell exhibits a significant defect (or Mn/B substitution). Transmission electron microscopy studies confirm the absence of a superstructure related to these defects/disorder. The two phases, Mn 3-x Rh 5 B 2 (x-0.34) and Mn 3-x Ir 5 B 2 (x-0.85) at 950 degrees C show rather limited homogeneity regions pointing towards higher Mncontents. Whereas temperature dependent magnetization and specific heat measurements of Mn 2.15 Ir 5 B 2 do not reveal any indication for a magnetic phase transition in the temperature range from 3 to 300 K, a broad specific heat anomaly at around 200 K and a tilde shape of the temperature dependent magnetization of Mn 2.66 Rh 5 B 2 appears indicative of an antiferromagnetic phase transition. The latter is also reflected by an anomaly of the electrical resistivity (rho; 4-300 K) of Mn 2.66 Rh 5 B 2 which displays a non-monotonous temperature dependence, whereas rho(T) of Mn 2.15 Ir 5 B 2 displays a simple metallic-like behavior dominated by scattering from defects. Elastic moduli and Poisson's ratio were determined at room temperature from Resonant Ultrasonic Spectroscopy (RUS) data yielding Young's moduli of E - 170 GPa for Mn 2.66 Rh 5 B 2 and E - 210 GPa for Mn 2.15 Ir 5 B 2 . Vickers hardness HV is lower for Mn 2.66 Rh 5 B 2 (HV = 590 - 5.79 GPa) than for Mn 2.15 Ir 5 B 2 (HV = 655 - 6.42 GPa). The indentation fracture toughness for Mn 2.15 Ir 5 B 2 was IK C = 0.71 +/- 0.5 MPa m 1/2 .
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页数:7
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