scholarly journals New possibilities for phase-variation structural diagnostics of multiparametrical monocrystalline systems with defects

2021 ◽  
Vol 24 (1) ◽  
pp. 5-15
Author(s):  
V.B. Molodkin ◽  
◽  
V.Yu. Storizhko ◽  
V.P. Kladko ◽  
V.V. Lizunov ◽  
...  
Keyword(s):  
Single Crystals ◽  
Phase Variation ◽  
Physical Nature ◽  
Azimuthal Dependence ◽  
Experimental Conditions ◽  
Dynamical Diffraction ◽  
Integrated Intensity ◽  
Non Destructive

Fundamental new features and physical nature of possibilities for purposeful influence of interrelated variations in different experimental conditions on changes of the selectivity of sensitivity of azimuthal dependence of the total integrated intensity dynamical diffraction to various types of defects in single crystals have been determined. As a result, the efficiency of the previously developed phase-variation principles of diagnostics has been improved. The proposed approach enabled us to demonstrate the presence of additional types of defects in the single crystals under study and to determine the defects parameters (sizes and concentrations). It makes it possible to obtain additional sensitivity and informativeness for phase-variation structure multiparametrical non-destructive diagnostics of monocrystalline systems with defects of various types.

scholarly journals Anomalous Sensitivity of Deformation Dependence of Total Integrated Intensity of Dynamical Diffraction to Microdefects in Single Crystals

2018 ◽  
Vol 40 (8) ◽  
pp. 1123-1131 ◽  
Author(s):  
V. B. Molodkin ◽  
◽  
A. I. Nizkova ◽  
V. V. Lizunov ◽  
V. V. Molodkin ◽  
...  
Keyword(s):  
Single Crystals ◽  
Dynamical Diffraction ◽  
Integrated Intensity ◽  
Deformation Dependence

scholarly journals Models of Deformation Dependences of Total Integrated Intensity of Dynamical Diffraction in Single Crystals for Various Diffraction Conditions

2016 ◽  
Vol 36 (8) ◽  
pp. 1035-1048 ◽  
Author(s):  
S. M. Brovchuk ◽  
◽  
V. B. Molodkin ◽  
A. I. Nizkova ◽  
I. I. Rudnytska ◽  
...  
Keyword(s):  
Single Crystals ◽  
Dynamical Diffraction ◽  
Integrated Intensity

scholarly journals Single-Sided Portable NMR Investigation to Assess and Monitor Cleaning Action of PVA-Borax Hydrogel in Travertine and Lecce Stone

Molecules ◽  
2021 ◽  
Vol 26 (12) ◽  
pp. 3697
Author(s):  
Valeria Stagno ◽  
Chiara Genova ◽  
Nicole Zoratto ◽  
Gabriele Favero ◽  
Silvia Capuani
Keyword(s):  
Pore Size ◽  
Experimental Conditions ◽  
Non Invasive ◽  
Bedding Planes ◽  
Paramagnetic Impurities ◽  
Two Samples ◽  
Action Time ◽  
Paramagnetic Agents ◽  
Portable Nmr ◽  
Non Destructive

In this work, we investigated the potential of PVA-borax hydrogel for cleaning limestones and the dependence of the cleaning on the porosity of the rock and on the action time of the hydrogel treatment. Towards this goal, we used a nuclear magnetic resonance (NMR) spectrometer, developed for non-invasive and non-destructive applications on cultural heritage. T2-NMR parameters were quantified on different samples of Lecce stone and Travertine cut perpendicular (Pe) and parallel (Pa) to the bedding planes under different experimental conditions: untreated samples, treated with Paraloid B72 and cleaned with PVA-PEO-borax hydrogel applied for 4 min and 2 h. The T2 results suggest that the effectiveness of the cleaning strongly depended on the porosity of the stones. In Lecce stone, the hydrogel seemed to eliminate both the paramagnetic impurities (in equal measure with 4 min and 2 h treatment) and Paraloid B72. In Travertine Pe, characterized by a smaller pore size compared to Lecce stone, no significant effects were found regarding both the cleaning and the treatment with Paraloid B72. In Travertine Pa, characterized by a larger pore size than the other two samples, the hydrogel seemed to clean the paramagnetic agents (it worked better if applied for a longer time) but it did not appear to have any effect on Paraloid B72 removal.

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