Production and decay of subcritical nuclei in a solid solution

Valov, P. M.; Leiman, V. I.; Derkacheva, O. Yu.; Maksimov, V. M.

doi:10.1134/s0021364010110093

Cited by 5 publications

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“…Correspondingly, the mean radius of the dis tribution D2 increases to R 2 = 2.3 nm. The average concentration of the particles of the distribution D2 is 7.7 × 10 15 cm -3 (the method for calculating the con centration of CuCl particles was presented in [1]). …”

Section: Formation Of Two Distributions Of Nanoparticles Of a Newmentioning

confidence: 99%

“…When the tempera ture varies in the process of nucleation, new factors that make it possible to control the growth of the new phase, as well as to obtain new data for developing the nucleation theory, can appear. In our preceding work [1], we revealed the effect of solution of nuclei of the CuCl phase in glass upon a sharp increase in the tem perature in the nucleation process and determined the critical radius of CuCl particles at temperatures from 500 to 650°C.…”

mentioning

confidence: 98%

“…As in [1], we study a solid solution of copper halo genide in a glass matrix. Samples 1and 2 with the ini tial distribution D1 of CuCl nanoparticles were pre pared at temperature T 1 = 700°C in 20 and 40 min, respectively.…”

mentioning

confidence: 99%

“…Radius distribution functions of the volume of CuCl clusters in glass with the same parameters as in[1,5] upon nucleation in the process of double annealing at 700°C for 10 min and, then, at 500°C for (…”

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confidence: 99%

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Formation of two distributions of nanoparticles of a new phase in a solid solution

Valov¹,

Leiman²,

Derkacheva³

et al. 2012

Jetp Lett.

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The critical radius of particles of a new phase nucleated in a solution depends on the supersaturation and temperature of the solution. When the tempera ture varies in the process of nucleation, new factors that make it possible to control the growth of the new phase, as well as to obtain new data for developing the nucleation theory, can appear. In our preceding work [1], we revealed the effect of solution of nuclei of the CuCl phase in glass upon a sharp increase in the tem perature in the nucleation process and determined the critical radius of CuCl particles at temperatures from 500 to 650°C.In this work, the nucleation process is studied in a stepwise cooled solid solution. This makes it possible to create two distributions of CuCl nanoparticles with significantly different mean radii in glass. First, at a high temperature (700°C), the distribution with a mean radius of 14-18 nm is created. Then, the nucle ation temperature is stepwise decreased by 200 K; as a result, the critical nucleation radius decreases, and the formation of the second distribution with a mean radius of 1-3 nm becomes possible.As in [1], we study a solid solution of copper halo genide in a glass matrix. Samples 1and 2 with the ini tial distribution D1 of CuCl nanoparticles were pre pared at temperature T 1 = 700°C in 20 and 40 min, respectively. The fundamental absorption spectra of CuCl nanocrystals in samples 1 and 2 were measured at 80 K. Then, the second annealing was performed at temperature T 2 = 500°C, during which samples were periodically extracted from a furnace and their absorp tion spectrum was measured at 80 K.Lines 1 in Fig. 1 are the absorption spectra of sam ples (a) 1 and (b) 2 after the first annealing at 700°C. Lines 1 pronouncedly exhibit exciton absorption bands Z 1, 2 and Z 3 associated with CuCl nanocrystals [2] from distribution D1. The mean radii of CuCl nanocrystals in samples 1 and 2 were determined from the energy of Z 1, 2 excitons and the size quantization relation [3,4]. The size quantization parameter for CuCl nanocrystals larger than 10 nm was obtained from the data taken from [4]. The distributions D1 with the mean radii R 1 = 14 and 18 nm of CuCl parti cles are formed in 20 and 40 min in samples 1 and 2, respectively, annealed at 700°C. According to Fig. 1a, during the second annealing (at T 2 = 500°C), additional absorption bands appear and grow on the right of the absorption bands of Z 1, 2 and Z 3 excitons of CuCl nanocrystals from the distri bution D1 (lines 2-5). With an increase in the anneal ing time, the maxima of these additional bands are shifted toward lower energies. These changes in the absorption spectrum of sample 1 certainly indicate the appearance of the second distribution D2 of CuCl nanocrystals with the corresponding absorption bands of Z 1, 2 and Z 3 excitons (marked by arrows in Fig. 1a). The blue shift of these absorption bands with respect to similar absorption bands of CuCl particles in the dis tribution D1 indicates that the radius of CuCl particles in the distribution D2 is s...

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Section: Formation Of Two Distributions Of Nanoparticles Of a Newmentioning

confidence: 99%

mentioning

confidence: 98%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Formation of two distributions of nanoparticles of a new phase in a solid solution

Valov¹,

Leiman²,

Derkacheva³

et al. 2012

Jetp Lett.

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“…Regarding the melting of nanocrystals, after the pioneering work of Takagi (1954) using electron microscopy studies, several other techniques were applied to investigate this transition. Among them, we can cite optical reflectance and absorption (Cheyssac et al, 1988;Valov & Leiman, 1997;Garrigos et al, 1989), differential scanning calorimetry (Haro-Poniatowski et al, 2005;Sheng et al, 1998;Luc ˇic ´et al, 2003), and X-ray diffraction and X-ray scattering (Bottani et al,1999;Kellermann & Craievich, 2008;Degenhardt et al, 2017;Kellermann et al, 2020). Most of these studies focus on the size dependence of the melting and freezing temperatures of spherical or nearly spherical nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Novel methodology to determine thermal properties of nanoparticles exclusively based on SAXS measurements applied to Bi nanocrystals and nanodroplets in a glass matrix

Kellermann,

Craievich

2023

J Appl Cryst

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A novel methodology is presented to determine thermal properties of polydisperse nanocrystals and/or nanodroplets embedded in a homogeneous matrix using small-angle X-ray scattering (SAXS). It is based solely on SAXS measurements at multiple temperatures and multiple moduli of the scattering vector. The proposed methodology can quantify the linear coefficients of thermal expansion of confined spherical nanocrystals and/or nanodroplets and the radius dependence of the melting temperature of confined spherical nanocrystals, even in samples with a broad size distribution. It is described through its application on a nanocomposite consisting of Bi nanocrystals/nanodroplets embedded in a sodium borate glass matrix. The linear coefficient of thermal expansion of Bi nanocrystals in the glass was ca 50% higher than that of bulk crystalline Bi, and the coefficient of liquid Bi nanodroplets was 25% smaller than that of bulk liquid Bi. The melting temperature of the spherical Bi nanocrystals decreased by ca 130 K when particle radii decreased from 82 to 23 Å. Even though SAXS measurements are generally expected to provide low-resolution structural parameters, this demonstrates that this technique allows for the characterization of rather weak temperature-dependent variations of size parameters during in situ heating processes and across melting transitions.

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Nonisothermal nucleation in the CuCl solid solution in glass: Dissolution of subcritical CuCl nuclei with a positive jump of the nucleation temperature

et al. 2013

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Production and decay of subcritical nuclei in a solid solution

Cited by 5 publications

References 1 publication

Formation of two distributions of nanoparticles of a new phase in a solid solution

Formation of two distributions of nanoparticles of a new phase in a solid solution

Novel methodology to determine thermal properties of nanoparticles exclusively based on SAXS measurements applied to Bi nanocrystals and nanodroplets in a glass matrix

Nonisothermal nucleation in the CuCl solid solution in glass: Dissolution of subcritical CuCl nuclei with a positive jump of the nucleation temperature

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