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Browsing by Author "Tylczynski, Z."

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Comment on "A study on structural, optical, mechanical and ferroelectric properties of tri-glycine barium nitrate single crystals"

Petrosyan, A.M.; Ghazaryan, V.V.; Tylczynski, Z.; Srinivasan, B.R. (Ferroelectric Letters Section. 42; 2015; 139-141.)

We argue that the "tri-glycine barium nitrate" crystal reported by R. Ezhil Vizhi and D. Rajan Babu, Ferroeclectrics Letters Section 40, 1-10 (2013) is not a new ferroelectric but a dubious crystal.
Comment on 'Synthesis, growth, structural, spectral, linear and nonlinear optical and mechanical studies of a novel organic NLO single crystal 4-bromo 4-nitrostilbene (BONS) for nonlinear optical applications'

Srinivasan, B.R.; Tylczynski, Z.; Nadkarni, V.S. (Optical Materials. 35(8); 2013; 1616-1618.)

We argue that the recently reported compound 4-bromo-4'-nitrostilbene (1) is not a novel organic NLO crystal as claimed by Dinakaran, Kalainathan, Opt. Mater. 35 (2013) 898-903, but instead a well known compound whose ...
Comments on 'Process development and characterization of centrosymmetric semiorganic nonlinear optical crystal: 4-dimethylaminopyridine potassium chloride'

Srinivasan, B.R.; Petrosyan, A.M.; Tylczynski, Z. (Physica B: Condensed Matter. 582; 2020; ArticleID_411997.)

The authors of the title paper [Phys B. Condens. Matter 538 (2018) 199-206) report to have grown 4-dimethylaminopyridine potassium chloride (4-DMAPKC) crystal by slow evaporation solution growth method. In this communication, ...
Comments on the paper "Growth and characterization of semi-organic nonlinear optical crystal: Urea thiourea cadmium sulfate"

Srinivasan, B.R.; Tylczynski, Z. (Journal of Thermal Analysis and Calorimetry. 121(2); 2015; 545-546.)

The authors of the title paper (Hanumantharao and Kalainathan in J Therm Anal Calorim 114:239–243, 2013) claim to have grown a novel nonlinear optical urea thiourea cadmium sulfate crystal, represented by no molecular ...
Comments on the paper "Growth and optical studies of tris (thiourea) potassium barium sulphate crystal: a novel semiorganic NLO bimetallic crystal"

Srinivasan, B.R.; Tylczynski, Z. (Materials Research Innovations. 24(1); 2020; 58-60.)

In a recent paper Azhar et al., (Mater. Res. Innov. https://doi.org/10.1080/14328917.2017.1392694) claim to have grown a tris (thiourea) potassium barium sulphate (TTPBS) crystal, which according to them is a novel NLO ...
Comments on the paper: "Crystal design, thermal and dielectric behavior of novel silver (Ag) co-ordinated thiourea single crystals"

Srinivasan, B.R.; Petrosyan, A.M.; Tylczynski, Z. (Materials Letters. 280; 2020; ArticleID_128675.)

The authors of the title paper (Mat. Lett. 272 (2020) 127899) report to have synthesized novel silver co-ordinated thiourea single crystals viz. TuAgN (1:1) (I) (Tu=thiourea; AgN=AgNO sub(3)) and TuAgN (4:1) (II) by ...
Iron doping in sodium para-nitrophenolate dihydrate crystal: A case study

Narvekar, K.U.; Nadkarni, V.S.; Tylczynski, Z.; Srinivasan, B.R. (Materials Today Communications. 19; 2019; 349-351.)

In this study we examine a case of iron doping in sodium para-nitrophenolate dihydrate single crystal recently reported by Dalal and Kumar (Mater. Lett. 165 (2016) 99-102). We show that, addition of ferric (Fe3+) ions into ...
Is "L-valine ferric chloride" a new nonlinear optical material?

Srinivasan, B.R.; Tylczynski, Z. (Published online on arXiv)

We argue that "L-valine ferric chloride" crystal reported by Geetha et al [Curr. Appl. Phys. 15 (2015) 201-207] is not a new nonlinear optical material but instead a dubious crystal.
On questionable ferroelectric and piezoelectric properties in single crystals

Tylczynski, Z.; Petrosyan, A.M.; Srinivasan, B.R. (Journal of Crystal Growth. 498; 2018; 62-66.)

In this short review, a critical analysis of the purported ferroelectric and piezoelectric properties of crystals which have been published is critiqued.
On the crystal growth of 'tris thiourea chromium(III) sulphate', 'potassium thiourea thiocyanide' and 'bis thiourea iron(II) sulphate'

Srinivasan, B.R.; Tylczynski, Z. (Journal of Thermal Analysis and Calorimetry. 121(3); 2015; 1183-1184.)

We argue that the 'tris thiourea chromium(III) sulphate' crystal (Madhurambal et al. in J Therm Anal Calorim 108:905-910, 2012), potassium thiourea thiocyanide crystal (Ramamurthi et al. in J Therm Anal Calorim 104:943-947, ...
Reinvestigation of growth of thiourea urea zinc sulfate crystal

Srinivasan, B.R.; Naik, T.A.; Tylczynski, Z.; Priolkar, K.R. (Spectrochimica Acta Part A-Molecular and Biomolecular Spectroscopy. 117; 2014; 805-809.)

Reinvestigation of the growth of thiourea urea zinc sulfate crystal is reported. Aqueous reaction of thiourea, urea and zinc sulfate in 1:1:1 mol ratio results in the formation of the well known [Zn(tu)3(SO4)] (1) (tu=thiourea) ...

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