Growth of negative solubility lithium sulfate monohydrate crystal by slow evaporation and Sankaranarayanan–Ramasamy method

Boopathi, K.; Rajesh, P.; Ramasamy, P.

doi:10.1016/j.jcrysgro.2012.01.036

Cited by 35 publications

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References 49 publications

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“…LSMH crystals grown by slow evaporation and Sankaranaryanan-Ramasamy method show negative solubility behavior as reported by Boopathi et al [11].…”

Section: Introductionsupporting

confidence: 70%

“…removal of water molecule from the LSMH crystal. From literature study we have found that LSMH is non ferroelectric [11], so the possibility of structural phase transition can be ruled out. The dielectric anomaly is thus due to dehydration of the crystal.…”

Section: Ft-ir Analysismentioning

confidence: 99%

“…The structural knowledge of LSMH was completed by Ozerov et al [9], after adding the hydrogen positions determined from a neutron diffraction study. LSMH crystals show the properties of pyroelectricity and piezoelectricity [10,11]. The various studies carried out on the title compound include non-linear optical * E-mail: basharatwant@gmail.com behavior, Raman spectroscopy, neutron diffraction at different temperatures and determination of pyroelectric coefficient [12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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Structural, optical and dielectric studies of lithium sulphate monohydrate single crystals

Najar

Vakil

Want

2017

Materials Science-Poland

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Optical, dielectric, and thermal properties of lithium sulphate monohydrate crystals grown by slow evaporation method have been studied. The crystal structure was resolved by direct methods using single crystal X-ray diffraction data collected at room temperature and refined by full-matrix least-squares procedures to a final R-value of 0.0174. Plasma energy, Penn gap, Fermi energy and electronic polarizability of the grown crystal were calculated from single crystal XRD data. The electronic polarizability of lithium sulfate monohydrate was also calculated and compared with the theoretical data using Clausius-Mossotti equation. Optical band gap calculated from optical data for the grown crystal is 4.49 eV. Fourier Transform Infrared Spectroscopy study confirmed the presence of water in the crystal structure. The AC conductivity, dielectric constant and dielectric loss of the grown crystal were systemically investigated, showing a peak at about 130°C which could be attributed to the water molecules in the crystal structure. The anomalous dielectric properties shown by the crystal have been correlated with its thermal behavior. The title crystal obeys Jonscher's power law relation; σ(ω) = σ o + Aω s , with temperature dependent exponent s < 1. The activation energy calculated for the material is 0.24 eV and suggests protonic conduction by hopping mechanism in addition to cationic conduction by lithium ions. The micro-indentation study was also carried out which revealed that the crystal belongs to a category of soft materials.

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“…LSMH crystals grown by slow evaporation and Sankaranaryanan-Ramasamy method show negative solubility behavior as reported by Boopathi et al [11].…”

Section: Introductionsupporting

confidence: 70%

Section: Ft-ir Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Structural, optical and dielectric studies of lithium sulphate monohydrate single crystals

Najar

Vakil

Want

2017

Materials Science-Poland

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Section: Figurementioning

confidence: 99%

A Niobium Oxyiodate Sulfate with a Strong Second‐Harmonic‐Generation Response Built by Rational Multi‐Component Design

et al. 2019

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A novel niobium oxyiodate sulfate, Nb2O3(IO3)2 (SO4), was fabricated by a rational multi‐component design under moderate hydrothermal conditions. This multi‐component design is inspired by an interesting niobium oxysulfate reaction, which opens a new door for synthetic method to effectively introduce refractory metals such as Nb into crystal structures by hydrothermal synthesis. Nb2O3(IO3)2(SO4) features a cube‐like topological structure with a large phase‐matching second harmonic generation (SHG) response (6×KDP), a wide transparency window (0.38–8 μm), and a high laser damage threshold (LDT) (20×AgGaS2). It has the highest thermostability (stable up to 580 °C under air) among reported non‐centrosymmetric (NCS) iodates and sulfates and is stable in water and even concentrated H2SO4. Furthermore, Nb2O3(IO3)2(SO4) is a unique nonlinear optical (NLO) material among iodates and sulfates, because its SHG effect is mainly caused by the MO6 units rather than the IO3 or SO4 units, which is demonstrated by density functional theory (DFT) calculations.

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“…Despite much research on NCS oxides with SHG responses,i ncluding iodates,b orates,p hosphates,a nd borate fluorides,n os ulfates with utilizable NLO properties have been reported. [16] Most sulfate NLO materials are susceptive to water and contain hydrate,which could become unstable in the heating process,f or example,B eSO 4 ·4 H 2 O, [17] Li 2 SO 4 ·H 2 O, [18] and Li 8 NaRb 3 (SO 4 ) 6 ·2 H 2 O. [19] At the same time,t hese sulfates have weak SHG responses.R ecently, (NH 4 )SbCl 2 (SO 4 )w as reported having am oderate SHG response (1.7 KDP), and the cooperation of SbCl 2 O 2 and SO 4 polyhedrons makes am ajor contribution to the SHG effect.…”

mentioning

confidence: 99%

A Niobium Oxyiodate Sulfate with a Strong Second‐Harmonic‐Generation Response Built by Rational Multi‐Component Design

et al. 2019

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An ovel niobium oxyiodate sulfate,N b 2 O 3 (IO 3 ) 2 (SO 4 ), was fabricated by ar ational multi-component design under moderate hydrothermal conditions.T his multi-component design is inspired by an interesting niobium oxysulfate reaction, whicho pens an ew door for synthetic method to effectively introduce refractory metals such as Nb into crystal structures by hydrothermal synthesis.N b 2 O 3 (IO 3 ) 2 (SO 4 )f eatures ac ube-like topological structure with al arge phasematching second harmonic generation (SHG) response (6 KDP), aw ide transparency window (0.38-8 mm), and ah igh laser damage threshold (LDT) (20 AgGaS 2 ). It has the highest thermostability (stable up to 580 8 8Cu nder air) among reported non-centrosymmetric (NCS) iodates and sulfates and is stable in water and even concentrated H 2 SO 4 .F urthermore, Nb 2 O 3 (IO 3 ) 2 (SO 4 )i saunique nonlinear optical (NLO) material among iodates and sulfates,b ecause its SHG effect is mainly caused by the MO 6 units rather than the IO 3 or SO 4 units,w hich is demonstrated by density functional theory (DFT) calculations.Owing to the various important properties of non-centrosymmetric (NCS) crystal materials,s uch as second harmonic generation (SHG), piezoelectricity,ferroelectricity,and pyroelectricity,t here is ag reat academic interest in synthesizing novel NCS crystal materials and researching their proper-ties. [1] Particularly in optical laser materials,many NCS crystal materials are extensively investigated for nonlinear optical (NLO) applications. [2] However,t he fabrication of utilizable NLO materials still remains challenging due to rigorous requirements including ap hase-matching capability,arelatively strong SHG response,awide transparencyw indow, ahigh laser damage threshold (LDT) and good physicochemical stability. [3] Thus,continuing endeavors have been focusing on the development of methods to design novel NCS crystal structures and explore potentially utilizable NLO materials.Ad esired purpose can be difficult to achieve in the development of au niversal method for the synthesis of new NCS crystal materials.F rom the view of molecular engineering, it is not possible to directly control the arrangement of atoms or molecules in acrystal structure. [4] In spite of this,an effective strategy for obtaining NCS crystal materials is to introduce d 0 transition-metal cations (for example,T i 4+ ,V 5+ , Mo 6+ ,Nb 5+ ,W 6+ ,T a 5+ )orlone pair cations (for example,I 5+ , Se 4+ ,T e 4+ )into the crystal structure,because these cations are susceptible to the second-order Jahn-Teller (SOJT) effect. [5] Nevertheless,considering that different elements have different properties in the synthetic process,s ome compounds are difficult to synthesize.F or example,alot of NCS iodates containing two types of SOJT cations (d 0 transition metal cations and lone pair cations) are synthesized under hydrothermal conditions,s uch as Li 2 Ti(IO 3 ) 6 , [6] TiO(IO 3 ) 2 , [7] K(VO) 2 O 2 (IO 3 ) 3 , [8] Tl(VO) 2 O 2 (IO 3 ) 3 , [9] LiMoO 3 (IO 3 ), [10] and CsMoO...

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Growth of negative solubility lithium sulfate monohydrate crystal by slow evaporation and Sankaranarayanan–Ramasamy method

Cited by 35 publications

References 49 publications

Structural, optical and dielectric studies of lithium sulphate monohydrate single crystals

Structural, optical and dielectric studies of lithium sulphate monohydrate single crystals

A Niobium Oxyiodate Sulfate with a Strong Second‐Harmonic‐Generation Response Built by Rational Multi‐Component Design

A Niobium Oxyiodate Sulfate with a Strong Second‐Harmonic‐Generation Response Built by Rational Multi‐Component Design

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