Phase Transitions最新文献_第4页

On the critical behaviour of the N-SmA phase transition in an induced system: an exploration from high-resolution calorimetric and optical studies 诱导体系中N-SmA相变的临界行为:来自高分辨率量热和光学研究的探索

4区材料科学

Phase Transitions Pub Date : 2023-10-06 DOI: 10.1080/01411594.2023.2262705

Apsari Parvin, Malay Kumar Das

{"title":"On the critical behaviour of the N-SmA phase transition in an induced system: an exploration from high-resolution calorimetric and optical studies","authors":"Apsari Parvin, Malay Kumar Das","doi":"10.1080/01411594.2023.2262705","DOIUrl":"https://doi.org/10.1080/01411594.2023.2262705","url":null,"abstract":"ABSTRACTA systematic study of a binary system composed of 4-n-pentyl 4′-cyanobiphenyl (5CB) and 4-n-pentyl phenyl 4-n′-hexyloxy benzoate (ME6O.5) mesogens showing an induced smectic A at different molar concentrations has been done. Heat capacity and optical birefringence measurements have been performed around the N-SmA phase transition region. The heat capacity peaks could be fitted well below the N-SmA transition by means of an extended Landau mean-field model. The first-order nature of the transition throughout the composition range can be inferred. This transition is rather close to the tricritical point when the nematic range is sufficiently increased. The latent heat decreases with the increase in the nematic range. For large nematic range, the latent heat drops to zero and the heat capacity peak associated with N-SmA phase transition disappear, contrary to previously reported most of the usual N-SmA phase transition. Precision birefringence measurements also agree well with the heat capacity data.KEYWORDS: Phase transitionheat capacitybirefringencelatent heatinduced smectic A phase Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingMKD acknowledges the financial support received from the University Assistance for Research Project [Project No: 2321/R-2022] and AP is grateful to the University Grants Commission [UGC/NFOBC/201920-19J6148547, JRF] for awarding fellowship.","PeriodicalId":19881,"journal":{"name":"Phase Transitions","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135351946","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermodynamic model to study the structural and electro-optical properties of chiral antiferroelectric smectic C phase exhibited by mesogenic homologous series 3FnHBM6(s) and W-316 mixture 用热力学模型研究了3FnHBM6(s)和W-316混合物的手性反铁电近晶C相的结构和电光性质

4区材料科学

Phase Transitions Pub Date : 2023-10-06 DOI: 10.1080/01411594.2023.2262701

Abhilasha Singh, Ayushi Rastogi, Shri Singh

{"title":"Thermodynamic model to study the structural and electro-optical properties of chiral antiferroelectric smectic C phase exhibited by mesogenic homologous series 3FnHBM6(s) and W-316 mixture","authors":"Abhilasha Singh, Ayushi Rastogi, Shri Singh","doi":"10.1080/01411594.2023.2262701","DOIUrl":"https://doi.org/10.1080/01411594.2023.2262701","url":null,"abstract":"ABSTRACTUsing a thermodynamic model developed by us to study the structural and electro-optical properties of SmCA∗ phase, we investigate the temperature dependence of helical pitch, tilt angle and spontaneous polarization of a homologous series of fluorinated biphenyl benzoate esters (3FnHBM6, n = 2, 5, 7) and one of the series W-316-3 obtained from the mixture of two chiral liquid crystalline compounds 6F2OBi and 3F6HBM6. The free-energy density of the system exhibiting SmCA∗ phase is written as an expansion series in terms of all the relevant degrees of freedom: Qij, ψ, P, q and the resulting coupling terms between these order parameters. The values of Landau coefficients are determined from the experimental data of antiferroelectric mesogens 3FnHBM6 (n = 2, 5, 7) and W-316-3 in the SmCA∗ phase. Using these coefficients, the electro-optical and structural properties have been studied. We have found good agreements between the theoretical and experimental results.KEYWORDS: Free energy density expansionantiferroelectric liquid crystalspontaneous polarizationsorder parametersstructural propertieselectro-optical properties AcknowledgementI would like to acknowledge JSSMVP Mysore for their kind support and encouragement.Disclosure statementNo potential conflict of interest was reported by the author(s).","PeriodicalId":19881,"journal":{"name":"Phase Transitions","volume":"214 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135350788","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A study of the crystallization kinetics of Sb-Se-Ge and Sb-Se-Ge-In chalcogenide glasses for applications as phase change materials 作为相变材料的Sb-Se-Ge和Sb-Se-Ge- in硫系玻璃的结晶动力学研究

4区材料科学

Phase Transitions Pub Date : 2023-10-04 DOI: 10.1080/01411594.2023.2262704

Anushikha Yadav, Sunanda Sharda

{"title":"A study of the crystallization kinetics of <i>Sb-Se-Ge</i> and <i>Sb-Se-Ge-In</i> chalcogenide glasses for applications as phase change materials","authors":"Anushikha Yadav, Sunanda Sharda","doi":"10.1080/01411594.2023.2262704","DOIUrl":"https://doi.org/10.1080/01411594.2023.2262704","url":null,"abstract":"ABSTRACTChalcogenide glasses are unquestionably one of the most popular materials known for their phase change property. Phase change materials (PCM) have a key role in the field of photonics, memory devices, imaging, etc. With an aim to study the worth of ternary Sb10Se90-xGex (x = 0, 19, 21, 23, 25, 27) and quaternary Sb10Se65Ge25-yIny (y = 0, 3, 6, 9, 12, 15) chalcogenide systems as PCM, the composition variation and effect of dopants on the thermal properties of two systems has been probed. The thermal stability of two glass systems has been investigated using criteria such as the S parameter, fragility index, and rate constants at glass transition and crystallization temperatures. The mechanism of the phase change phenomenon occurring in the glasses has been studied using the Avrami index.KEYWORDS: Chalcogenidesthermal stabilityAvrami exponentcrystallization Disclosure statementNo potential conflict of interest was reported by the author(s).Data availability statementThis manuscript has no associated data, or the data will not be deposited. [Authors’ comment: The related data and results obtained have been shown/reported in the figures and tables.]","PeriodicalId":19881,"journal":{"name":"Phase Transitions","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135592727","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Eﬀect of graphene nanoparticles on the isotropic to nematic phase transition 石墨烯纳米颗粒对各向同性向列相转变的影响

4区材料科学

Phase Transitions Pub Date : 2023-09-27 DOI: 10.1080/01411594.2023.2262703

Prabir Kumar Mukherjee

引用次数: 0

Significant reduction of thermomagnetic hysteresis in NdMn2-xAgxSi2 (0 ≤ x ≤ 0.4) alloys NdMn2-xAgxSi2（0 ≤ x ≤ 0.4）合金

IF 1.6 4区材料科学

Phase Transitions Pub Date : 2023-09-08 DOI: 10.1080/01411594.2023.2213380

Guiquan Yao, Guoqing Zeng, Qiang Wang, Weibin Cui

引用次数: 0

Grain size effects on dielectric properties of yttrium doped BaTiO3 ceramics 晶粒尺寸对掺钇BaTiO3陶瓷介电性能的影响

IF 1.6 4区材料科学

Phase Transitions Pub Date : 2023-09-05 DOI: 10.1080/01411594.2023.2253957

Zineb Gargar, A. Tachafine, D. Fasquelle, A. Zegzouti, M. Elaatmani, Mohamed Daoud

引用次数: 1

Vibrational dynamics, Hirshfeld surface and molecular docking studies by quantum computational analysis of 3-Hydroxy-4-nitrobenzaldehyde 基于量子计算分析的3-羟基-4-硝基苯甲醛振动动力学、Hirshfeld表面和分子对接研究

IF 1.6 4区材料科学

Phase Transitions Pub Date : 2023-08-25 DOI: 10.1080/01411594.2023.2249197

K. Nagarajan, N. Surumbarkuzhali, K. Parimala

{"title":"Vibrational dynamics, Hirshfeld surface and molecular docking studies by quantum computational analysis of 3-Hydroxy-4-nitrobenzaldehyde","authors":"K. Nagarajan, N. Surumbarkuzhali, K. Parimala","doi":"10.1080/01411594.2023.2249197","DOIUrl":"https://doi.org/10.1080/01411594.2023.2249197","url":null,"abstract":"ABSTRACT In the present work, we report the experimental and computational investigations of 3-Hydroxy-4-nitrobenzaldehyde (3H4NB) were examined. Comparing observed and simulated vibrational spectra allowed for the identification of characteristic frequencies and the attribution of band names. For the density functional theory (DFT) calculations, the LSDA functional with 6-311 + G(d,p) degree of approximation was used. Furthermore, the same level of theory was used to calculate molecular orbitals such as natural bond orbitals (NBOs) and the HOMO–LUMO energy gap. The condensed Fukui function and the molecular electrostatic potential (MEP) surface were used to determine the relative electrophilicity and nucleophilicity of the current molecule. Intermolecular hydrogen bonding interactions are studied using Hirshfeld surface analysis and fingerprint plots. Molecular docking analysis was used to investigate the compound's biological activities. The hydrogen bond active binding residues and binding energy of a chosen chemical with carcinogenic activity targets were examined.","PeriodicalId":19881,"journal":{"name":"Phase Transitions","volume":"96 1","pages":"687 - 709"},"PeriodicalIF":1.6,"publicationDate":"2023-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47135588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electrically induced orientational instability of the director in a homeotropic nematic liquid crystal cell and its effect on surface plasmon oscillations 垂直向列型液晶盒中指向矢的电致取向不稳定性及其对表面等离子体振荡的影响

IF 1.6 4区材料科学

Phase Transitions Pub Date : 2023-08-23 DOI: 10.1080/01411594.2023.2247130

I. Yakovkin, Mykhailo Ledney

引用次数: 0

High-temperature impedance properties of Sr1-xCaxTiO3 ceramics for lead-free capacitor applications 无铅电容器用Sr1-xCaxTiO3陶瓷的高温阻抗特性

IF 1.6 4区材料科学

Phase Transitions Pub Date : 2023-08-15 DOI: 10.1080/01411594.2023.2244640

A. Tachafine, Hicham Ait Laasri, J. Carru, D. Fasquelle

引用次数: 0

Compositional dependence of physical parameters of Sb-doped InSe nanochalcogenide alloys 掺硒铟硒纳米硫系合金物理参数的组分依赖性

IF 1.6 4区材料科学

Phase Transitions Pub Date : 2023-08-09 DOI: 10.1080/01411594.2023.2244113

Diksha Thakur, V. S. Rangra

引用次数: 0