The ternary RE–Si–B systems (RE=Dy, Ho, Er and Y) at 1270K: Solid state phase equilibria and magnetic properties of the solid solution REB2−xSix (RE=Dy and Ho)

Roger, Jérôme; Babizhetskyy, Volodymyr; Guizouarn, Thierry; Hiebl, K.; Guérin, R.; Halet, Jean‐François

doi:10.1016/j.jallcom.2005.09.012

Cited by 29 publications

(22 citation statements)

References 26 publications

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“…However, in fields below 1 kOe, there is an addition weak feature visible at T C = 15 K for the crystal used in the D10 experiment. This has been attributed to the ferromagnetic transition in a small HoB 2 impurity [30]. No feature in χ (T ) nor depolarization of the neutron beam was observed for the crystal used during the D7 experiment suggesting the ferromagnetic impurity was insignificant for this sample.…”

Section: Methodsmentioning

confidence: 82%

Field-induced magnetic states in holmium tetraboride

et al. 2017

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A study of the zero field and field induced magnetic states of the frustrated rare earth tetraboride HoB 4 has been carried out using single crystal neutron diffraction complemented by magnetization measurements. In zero field, HoB 4 shows magnetic phase transitions at T N1 = 7.1 K to an incommensurate state with a propagation vector (δ,δ,δ ), where δ = 0.02 and δ = 0.43 and at T N2 = 5.7 K to a noncollinear commensurate antiferromagnetic structure. Polarized neutron diffraction measurements in zero field have revealed that the incommensurate reflections, albeit much reduced in intensity, persist down to 1.5 K despite antiferromagnetic ordering at 5.7 K. At lower temperatures, application of a magnetic field along the c axis initially re-establishes the incommensurate phase as the dominant magnetic state in a narrow field range, just prior to HoB 4 ordering with an up-up-down ferrimagnetic structure characterized by the (h k 1 3 )-type reflections between 18 and 24 kOe. This field range is marked by the previously reported M/M sat = 1 3 magnetization plateau, which we also see in our magnetization measurements. The region between 21 and 33 kOe is characterized by the increase in the intensity of the antiferromagnetic reflections, such as (100), the maximum of which coincides with the appearance of the narrow magnetization plateau with M/M sat ≈ 3 5 . Further increase of the magnetic field results in the stabilization of a polarized state above 33 kOe, while the incommensurate reflections are clearly present in all fields up to 59 kOe. We propose the H -T phase diagram of HoB 4 for the H c containing both stationary and transitionary magnetic phases which overlap and show significant history dependence.

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Section: Methodsmentioning

confidence: 82%

Field-induced magnetic states in holmium tetraboride

et al. 2017

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“…Compound HoSi with an orthorhombic structure of FeB type was revealed in [1]. This structure was later reported in [3][4][5]. Holmium monosilicide with a CrB-type structure was found in [6] and then ascertained in [4,5,7,8].…”

Section: Introductionmentioning

confidence: 99%

“…Holmium monosilicide with a CrB-type structure was found in [6] and then ascertained in [4,5,7,8]. It is believed [3,4] that the two structures belong to stoichiometric composition and, thus, can be regarded as polymorphic modifications of the compound: FeB-type structure as a high-temperature modification and CrB-type structure as a low-temperature modification. The FeB-type structure was found in [5] in alloys on the silicon side relative to HoSi and the CrB structure in alloys on the holmium side.…”

Section: Introductionmentioning

confidence: 99%

“…The composition of the compound is indicated as HoSi 2 in [12]. The compound has a homogeneity range at 1000°C near HoSi 1.67-1.6 according to [3] and near HoSi 1.8-1.63 according to [13]. In constructing the phase diagram of the system [8,14,15], thermal effects were observed at 795°C in the range at about 60 at.% Si, which were attributed to polymorphic transformation of HoSi 2-b .…”

Section: Introductionmentioning

confidence: 99%

“…A tetragonal structure of α-ThSi 2 type was revealed in [7] for higher disilicide HoSi 2-a . According to [3,8,13,[16][17][18], the composition of the compound varies between HoSi 2 and HoSi 1.63 .…”

Section: Introductionmentioning

confidence: 99%

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Thermodynamic and thermochemical characteristics of holmium silicides

Goncharuk

Sidorko

Gorbachuk

et al. 2011

Powder Metall Met Ceram

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are determined by the electromotive force method. The heat capacity and enthalpy of HoSi 1.67 in the temperature range 55-2007 K are measured with adiabatic and mixing calorimetry. The enthalpy and entropy of α → β polymorphic transformation and melting of HoSi 1.67 are established. Temperature dependences of the heat capacity, enthalpy, and entropy of HoSi and Ho 5 Si 3 are evaluated based on the behavior of heat capacity of mono-and lower silicides of rare-earth metals and their melting enthalpies in the series from La to Lu.

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Lanthanides: Boride, Carbide, and Nitride Compounds

Mori

2012

Encyclopedia of Inorganic and Bioinorganic Chemistry

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Rare earth elements form a rich variety of compounds with boron, carbon, and nitrogen. The rare earth borides, carbides, and nitrides tend to be highly refractory compounds, typically with melting points above 2300 K. One way of looking at the less metal‐rich compounds is that the boron, carbon, and nitrogen atoms, respectively, form strongly covalent atomic networks in which rare earth atoms occupy particular spaces/voids. The strong covalent bonding among the network atoms is the origin for the high temperature stability, while the rare earth elements typically play a critical role in the physical properties, namely, functionalization of the material. For example, especially in the case of boron, boron has one less electron than carbon and therefore it is electron deficient when forming atomic networks compared to carbon networks such as graphite and fullerenes. However, this causes boron to have an especially good affinity with the rare earth elements, which are localized and can occupy voids in the boron network while readily supplying electrons to stabilize novel structures, providing a wide variety of compounds that are introduced in this chapter, together with carbides and nitrides. Furthermore, the shell of f electrons can provide interesting physical properties such as magnetism and luminescence and also provide possible tuning of the electronic properties. In this sense, as functional materials, the rare earth elements play a critical role in the functionalization, although their content may be low in the higher borides, carbides, and nitrides. This is one important direction in which to strive in the current world where natural resources are limited, namely, to highly functionalize materials that are mainly composed of abundant light elements through the innovative use of a small amount of rare element. In this chapter, I briefly review what is known of the rare earth borides, carbides, and nitrides. This review would particularly like to showcase interesting features of the crystal structure and intriguing physical properties ranging from the fundamental to the very applicable, with an emphasis on recent emerging results in important functionalities such as magnetism, thermoelectricity, and superconductivity.

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The ternary RE–Si–B systems (RE=Dy, Ho, Er and Y) at 1270K: Solid state phase equilibria and magnetic properties of the solid solution REB2−xSix (RE=Dy and Ho)

Cited by 29 publications

References 26 publications

Field-induced magnetic states in holmium tetraboride

Field-induced magnetic states in holmium tetraboride

Thermodynamic and thermochemical characteristics of holmium silicides

Lanthanides: Boride, Carbide, and Nitride Compounds

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