Ternary chlorides of the trivalent late lanthanides

Seifert, H. J.

doi:10.1007/s10973-005-7132-7

Cited by 39 publications

(15 citation statements)

References 65 publications

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“…Ions have to move from one site to another passing strong potential walls of other ions. The resulting 'kinetic hindrance' can cause a great difference between reaction temperatures, measured in DSC heating and cooling runs (thermal hysteresis) [9]. In extreme cases during cooling experiments the 'undercooling' can become so strong that the reaction does not occur in the DSC time-scale.…”

mentioning

confidence: 99%

Practical remarks concerning phase diagrams determination on the basis of differential scanning calorimetry measurements

Rycerz

2013

J Therm Anal Calorim

104

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Phase diagrams of binary systems at constant pressure are representations of one-and two-phase regions with their boundaries being functions of temperature and concentration. The most popular techniques used in determination of phase diagrams are thermal analysis (TA), differential thermal analysis (DTA) and differential scanning calorimetry (DSC). The first of them, based on recording of cooling curves, has no significant meaning nowadays; however, it is still used, especially in didactics. Actually DTA and DSC are widely used in phase diagrams determination. DSC has an advantage over DTA, because in addition to temperature it gives precise value of enthalpy of thermal effect. Two types of DSCs must be distinguished: the heat flux DSC and the power compensation DSC.The characteristic feature of all DSC measuring systems is the twin-type design and the direct in-difference connection of the two measuring systems which are of the same kind. It is the decisive advantage of the differential principle that, in first approximation, disturbances such as temperature variations in the environment of the measuring system and the like, affect the two measuring systems in the same way and are compensated when the difference between the individual signals is formed [1]. The differential signal is the essential characteristic of each DSC. Another characteristic-which distinguishes it from most classic calorimeters-is the dynamic mode of operation. The DSC can be heated or cooled at a preset heating or cooling rate. A characteristic common to both types of DSC is that the measured signal is proportional to a heat flow rate (in opposition to classical calorimeters where heat flow is measured). This fact-directly measured heat flow rates-enables the DSC to solve problems arising in many fields of application [1]. In the heat flux DSC a defined exchange of the heat to be measured takes place via a thermal resistance. The measurement signal is the temperature difference; it describes the intensity of the exchange and is proportional to the heat flow rate. There are two main types of the heat flux DSC: the disc-type measuring system with solid sample support (disc) and the cylinder-type measuring system with integrated sample cavities. Heat flux DSCs with a disctype measuring system are available for temperatures between -190 and 1,500°C [1]. In the heat flux DSC with a cylindertype measuring system, the outer surfaces of each sample container are in contact with a great number of thermocouples connected in a series between the container and furnace cavity. The thermocouples bands or wires are the dominating heat conduction path from the furnace to samples. Both sample containers are thermally decoupled; heat exchange takes place only with parts of the massive furnace. These apparatuses are available for temperature range between -190 and 1,500°C [1]. The power compensation DSC belongs to the class of heat-compensating calorimeters. The heat to be measured is compensated with electric energy, by increasing or decreasing an adjusta...

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confidence: 99%

Practical remarks concerning phase diagrams determination on the basis of differential scanning calorimetry measurements

Rycerz

2013

J Therm Anal Calorim

104

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“…Because the XRD pattern of monoclinic Cs 3 YbCl 6 is not filed in the JCPDS database, we constructed a simulated pattern from previously reported crystallographic data. [35,53] Cs 3 YbCl 6 exhibits a monoclinic unit cell with a C2/c space group (#15); the lattice parameters and atomic coordinates are tabulated in Tables S1 and S2, Supporting Information. The XRD pattern of the Cs 3 YbCl 6 NCs is well-matched with the simulated result, confirming the monoclinic phase of the Cs 3 YbCl 6 structure.…”

Section: Resultsmentioning

confidence: 99%

“…Simulated XRD patterns were constructed using CrystalDiffract6 Software, using the structure factor F HKL with the reported crystal structure. [ 35,53 ] The structure factor was derived by summing the amplitude scattered by each atom in the unit cell as follows:

\begin{matrix} F (h k l) = \sum_{normaln = 1}^{N} f_{normaln} \exp ({}, 2 π normali (h x_{normaln} + k y_{normaln} + l z_{normaln})) \end{matrix}

where hkl are the Miller indices of the reflection, f n is the atomic scattering factor of the n th atom in the unit cell, and {x n , y n , z n } are the fractional coordinates of the atoms.…”

Section: Methodsmentioning

confidence: 99%

Highly Luminescent and Multifunctional Zero‐Dimensional Cesium Lanthanide Chloride (Cs₃LnCl₆) Colloidal Nanocrystals

Lee

Hong

et al. 2022

Advanced Optical Materials

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all-inorganic ternary perovskite nanocrystals (NCs) are widely studied for their promising characteristics as semiconducting materials for optoelectronic applications owing to their high photoluminescence (PL) quantum yields (PLQYs) and narrow emission bandwidths. [3] The optical properties of perovskite NCs can be tuned by tailoring their sizes, compositions, and confined dimensions. [4][5][6][7] In addition to size confinement on the nanoscale, the dimensionality of ternary metal halides can be defined based on the arrangement of the [BX 6 ] octahedral units in the crystal structure. [8,9] Lattice distortion occurs within the metal halide structure depending on the size of the elements or the coordination number of the A cations. This induces either a two-or 1D arrangement, wherein the [BX 6 ] octahedra are linked in two directions or one direction, respectively, or complete isolation of the octahedral units (0D). [10][11][12] Among these, 0D materials have recently attracted considerable attention because their unique optical and electronic properties are distinct from those of 3D metal halide perovskite structures. [13] Specifically, 0D metal halide materials have electronically separated polyhedra or clusters resulting in a large bandgap, low conductivity, and low mobility. [8,14,15] In addition, these materials show enhanced radiative recombination owing to the self-trapping of excitons [16,17] or defects [18,19] in the spatially isolated octahedrons and broadband PL properties attributed to strong exciton-phonon coupling.Several studies have synthesized 0D metal halide structures with isolated metal halide octahedral building blocks, and their intrinsic properties have been investigated by tailoring the composition. For example, 0D Cs 4 PbBr 6 perovskites have been extensively studied because of their unique optical properties such as high PLQY, as well as high thermal, chemical, and photostabilities; however, the origin of the green emission of Cs 4 PbBr 6 is still under debate. [20][21][22][23] Lead-free 0D metal halides have also been reported, containing either main group elements, such as tin, [24,25] bismuth, [26] indium, [27] and antimony, [28] or transition metals, such as copper, [29] manganese, [30] and zinc. [31] These metal halides can be utilized as Herein, the synthesis of novel, highly luminescent, and nearly monodisperse zero-dimensional (0D) cesium lanthanide chloride (Cs 3 LnCl 6 ; Ln = Y, Ce, Gd, Er, Tm, Yb) colloidal nanocrystals (NCs) is reported for the first time. The Cs 3 LnCl 6 NCs are synthesized using a heating-up method and exhibit highly uniform size and shape. The monoclinic-phase Cs 3 LnCl 6 NCs contain completely isolated [LnCl 6 ] 3− octahedral units, resulting in 0D ternary metal halide structures. Therefore, these NCs exhibit deep-blue photoluminescence under ultraviolet excitation, and this photoluminescence can be tuned by changing the lanthanide cations within the [LnCl 6 ] 3− octahedral units. High photoluminescence quantum yields of up to 60% and 90% are observed for...

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“…188 To improve the conductivity of these materials, substituent metals have been introduced: divalent 189 (mainly the rst row transition metals and Mg, Pb, etc.) and trivalent (mainly Group 3 elements Sc, Y; rare earth elements, La-Lu; 69,[190][191][192][193][194] octahedra forms a honeycomb-like arrangement (Fig. 8b).…”

Section: Milling and Crystallization Effects In LI 3 Mclmentioning

confidence: 99%

On the underestimated influence of synthetic conditions in solid ionic conductors

et al. 2021

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Ternary chlorides of the trivalent late lanthanides

Cited by 39 publications

References 65 publications

Practical remarks concerning phase diagrams determination on the basis of differential scanning calorimetry measurements

Practical remarks concerning phase diagrams determination on the basis of differential scanning calorimetry measurements

Highly Luminescent and Multifunctional Zero‐Dimensional Cesium Lanthanide Chloride (Cs₃LnCl₆) Colloidal Nanocrystals

On the underestimated influence of synthetic conditions in solid ionic conductors

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Ternary chlorides of the trivalent late lanthanides

Cited by 39 publications

References 65 publications

Practical remarks concerning phase diagrams determination on the basis of differential scanning calorimetry measurements

Practical remarks concerning phase diagrams determination on the basis of differential scanning calorimetry measurements

Highly Luminescent and Multifunctional Zero‐Dimensional Cesium Lanthanide Chloride (Cs3LnCl6) Colloidal Nanocrystals

On the underestimated influence of synthetic conditions in solid ionic conductors

Contact Info

Product

Resources

About

Highly Luminescent and Multifunctional Zero‐Dimensional Cesium Lanthanide Chloride (Cs₃LnCl₆) Colloidal Nanocrystals