Size distribution of CuCl nanoparticles in glass in various stages of nucleation

Valov, P. M.; Leiman, V. I.

doi:10.1134/s1063783409080319

Cited by 13 publications

(4 citation statements)

References 3 publications

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“…When the reheating temperature reaches 400 • C and 450 • C, heat-treated BG specimen becomes colorless (Figure 1), indicating the possible disappearance of the CsPbBr 3 PNCs or enlargement of the effective band gap energies of CsPbBr 3 PNCs. [45][46][47] Due to the low melting temperature of bulk CsPbBr 3 crystal (melting temperature of 567 • C and crystallization temperature of 514 • C) 48 and size effect induced reduction in melting temperature of nanoparticles, 49,50 melting of CsPbBr 3 PNCs at temperatures of 350-400 • C is considered to be mainly responsible for the reheating induced changes in appearance of heat-treated BG specimen. For CsPb(Cl/Br) 3 PNCs, CsPb(Br/I) 3 PNCs (Figure S2), or CsPbI 3 PNCs embedded glass specimens, similar changes are also observed upon reheating.…”

Section: Resultsmentioning

confidence: 99%

Precipitation of cesium lead halide perovskite nanocrystals in glasses based on liquid phase separation

Zhang

et al. 2022

J Am Ceram Soc.

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Incorporation of cesium lead halide perovskite nanocrystals (CsPbX 3 PNCs, X = Cl, Br, I) into glasses can significantly improve their stabilities and extend their application areas. Precipitation of CsPbX 3 PNCs in glasses is mainly based on thermal treatment; however, the formation of mechanism is not clarified.Here, several in situ methods are employed to illustrate the precipitation mechanism of CsPbX 3 PNCs. It is found that precipitation of CsPbX 3 PNCs in glasses is based on the liquid phase separation in solid amorphous matrix, followed by crystallization in the supercooled state. Liquid phase separation process determines the composition of CsPbX 3 PNCs, and cooling process has strong effect on the crystallinity and quality of CsPbX 3 PNCs. These results clarify the precipitation mechanism of CsPbX 3 PNCs in glasses and provide important guideline for the development of CsPbX 3 PNCs embedded glasses for opto-electronic applications.

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Section: Resultsmentioning

confidence: 99%

Precipitation of cesium lead halide perovskite nanocrystals in glasses based on liquid phase separation

Zhang

et al. 2022

J Am Ceram Soc.

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“…3), as well as the relationship for the dependence of the melting temperature of CuCl nanocrystals on the par ticle radius (3) where the melting temperature T ∞ of CuCl microcrys tals and the parameter a were obtained from the exper imental data [6,8].…”

Section: Sample Preparation Experimentalmentioning

confidence: 99%

“…Experimental investigations of the kinetics of nucleation on model solutions were also performed at a fixed temperature [4][5][6][7][8][9] or with a temperature jump [10,11]. Under nonisothermal conditions, changes in the supersatu ration and critical radius are caused by both the nucle ation and variation in the temperature, which makes it possible to control the growth of a new phase and to obtain new data for the development of the nucleation theory.…”

Section: Introductionmentioning

confidence: 99%

Nonisothermal nucleation in the CuCl solid solution in glass: Nucleation under continuous cooling of the solid solution

Leiman¹,

Valov²,

Maksimov³

et al. 2015

Phys. Solid State

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The processes of nonisothermal nucleation in the CuCl solid solution in glass under continuous cooling from 700 to 500°C have been investigated. It has been shown that, in the studied cooling modes, regardless of the cooling rate, two distributions of CuCl nanoparticles with radii in the ranges of 8-20 and 2.5-3.5 nm in the absence of particles with intermediate radii are formed. The simulation of the nucleation under continuous cooling of the solid solution has revealed some features in the kinetics of the formation of two distributions of nanoparticles that differ significantly in size. It has been found that, under specific con ditions, there can arise one wide distribution (strongly overlapping distributions). The role of a change in the critical radius during the nonisothermal nucleation (cooling of the solid solution) in the formation of a binary distribution has been demonstrated.

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“…Since NC distribution of radius takes a place in the glass, first the smallest CuCl particles of the distribution are melted, and then with increasing temperature the nanocrystals of bigger radii are melted. Thus, there is an optical scanning melting distribution of CuCl NC [3].As a result, we have experimental curve of melting CuCl nanoparticles -dependence of optical absorption coefficient of the sample on temperature K0(T). Derivation K0(T)/dT is intensity of melting CuCl phase in dependence on sample temperature at linearly increasing temperature.…”

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confidence: 99%

Exciton-thermal analysis of nonisothermal nucleation in solid solution of CuCl in glass

et al. 2016

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Abstract. The work presents results of investigation of nucleation of CuCl nanocrystals in glass by method of exiton-thermal analysis (ETA) which is based on measuring the optical absorbance of CuCl phase in sample under heating up to the melting temperature of CuCl nanocrystals. The melting temperature of nanoparticle depends on its radius. Therefore analysis of curve of melting CuCl phase allows to determine distribution curve of nanoparticles on their radii. By the method of ETA the features of variation of CuCl nanoparticles distributions in glass when changing regime of sample annealing (nonisothermal nucleation) were studied. For example, by reducing the heating rate of the sample the concentration of particles of CuCl phase increases considerably while reducing average radius.Method of exiton-thermal analysis (ETA) of melting-crystallization of CuCl nanoparticles in glass is based on application of the well known Urbach's rule [1]. The rule reads: the long-wavelength absorption edge of crystals at different temperatures intersects in one "node point". The Urbach's rule is true for most of transparent media [2].If you heat the sample and transmit light with energy of "node point" photon through the sample of glass with CuCl nanocrystals (NC), then absorbance NC CuCl does not change until beginning NC melting. Melting CuCl NC leads to transition of the nanoparticles in the amorphous state and the exciton states, which ensure absorption in the "nodal point", disappear. But zone-zone absorption of CuCl nanomelt remains. This absorption is almost two times less than nanocrystals one. The temperature of melting CuCl NC decreases with decreasing particles radius. Since NC distribution of radius takes a place in the glass, first the smallest CuCl particles of the distribution are melted, and then with increasing temperature the nanocrystals of bigger radii are melted. Thus, there is an optical scanning melting distribution of CuCl NC [3].As a result, we have experimental curve of melting CuCl nanoparticles -dependence of optical absorption coefficient of the sample on temperature K0(T). Derivation K0(T)/dT is intensity of melting CuCl phase in dependence on sample temperature at linearly increasing temperature. Since melting NC of determined radius takes place at corresponding temperature, it is possible to obtain from the function K0(T)/dT the distribution of CuCl phase in sample on radii -the curve fV(r)=dV/dR.

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Size distribution of CuCl nanoparticles in glass in various stages of nucleation

Cited by 13 publications

References 3 publications

Precipitation of cesium lead halide perovskite nanocrystals in glasses based on liquid phase separation

Precipitation of cesium lead halide perovskite nanocrystals in glasses based on liquid phase separation

Nonisothermal nucleation in the CuCl solid solution in glass: Nucleation under continuous cooling of the solid solution

Exciton-thermal analysis of nonisothermal nucleation in solid solution of CuCl in glass

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