This paper reports that two kinds of polymers with high infrared transparency and good mechanical and physical properties have been prepared.An internal standard method is used to evaluate the infrared transparency of...This paper reports that two kinds of polymers with high infrared transparency and good mechanical and physical properties have been prepared.An internal standard method is used to evaluate the infrared transparency of the binders.The physical and mechanical properties of the binders are measured according to corresponding standards. The results show the absorbance of polymer A in 8-14 μm range is 26% that of the ethylene-vinyl acetate copolymer （EVA）,and polymer B is 9% that of the EVA correspondingly.The film of polymer A shows good flexibility of above 1 mm,a hardness of grade 1,and adhesion of grade 2.The film of polymer B shows good flexibility of above 1 mm,a hardness of grade 1,and adhesion of grade 1.展开更多
Polymorphism is crucial for unraveling crystallization mechanisms,predicting crystal structures and discovering novel materials.A new high-symmetry polymorph of Li_(2)TeMo_(3)O_(12),β-Li_(2)TeMo_(3)O_(12),was identif...Polymorphism is crucial for unraveling crystallization mechanisms,predicting crystal structures and discovering novel materials.A new high-symmetry polymorph of Li_(2)TeMo_(3)O_(12),β-Li_(2)TeMo_(3)O_(12),was identified successfully by a spontaneous crystallization technique,and it exhibits improved thermal stability and crystallizes in the trigonal space group R3(No.148)in contrast to the metastable α-Li_(2)TeMo_(3)O_(12).Thermal analysis and variable-temperature X-ray diffraction powder patterns demonstrated an irreversible phase transition of Li_(2)TeMo_(3)O_(12)from α-Li_(2)TeMo_(3)O_(12)to β-Li_(2)TeMo_(3)O_(12).High-quality and centimetre-sized single crystals of β-Li_(2)TeMo_(3)O_(12)were extracted via a facile flux approach.Moreover,optical characterization showed that it has a large bandgap of 3.05 eV accompanied by high transparency from 0.34 to 5.4μm,encompassing a 3-5μm atmospheric window.Remarkably,the title compound features the intriguing merits of an intrinsically strong Raman shift located at 955 cm^(−1) and a narrow line width of 12.54 cm^(−1),which enable it to act as a stimulated Raman laser,making it a promising mid-infrared Raman crystal.Additionally,theoretical investigations are used to evaluate the fundamental relationships between the compound’s structure and optical properties.展开更多
A non-centrosymmetric metal-free thiophosphate,γ-P_(4)S_(3)I_(2),was successfully synthesized utilizing polymorphism strategy in this study.γ-P_(4)S_(3)I_(2)crystallized in the space group of P4_(3)and featured para...A non-centrosymmetric metal-free thiophosphate,γ-P_(4)S_(3)I_(2),was successfully synthesized utilizing polymorphism strategy in this study.γ-P_(4)S_(3)I_(2)crystallized in the space group of P4_(3)and featured paralleled(P_(4)S_(3)I_(2))_(n)molecular clusters.Importantly,it exhibited promising nonlinear optical(NLO)performances,such as a phase-matchable second harmonic generation(SHG)efficiency(0.5×AgGaS_(2)),wide band gap(2.38 eV),large birefringence(0.118@2050 nm),and wide infrared transparency,suggesting thatγ-P_(4)S_(3)I_(2)may be a potential IR NLO candidate.展开更多
Herein,we report two new selenite/tellurite bromide compounds,namely,CdPb_(8)(SeO_(3))_(4)Br_(10) and Pb_(3)(TeO_(3))Br_(4).The former crystallized in a centrosymmetric space group,while the latter is a non-centrosymm...Herein,we report two new selenite/tellurite bromide compounds,namely,CdPb_(8)(SeO_(3))_(4)Br_(10) and Pb_(3)(TeO_(3))Br_(4).The former crystallized in a centrosymmetric space group,while the latter is a non-centrosymmetric compound.Specifically,CdPb_(8)(SeO_(3))_(4)Br_(10) demonstrates high thermal stability(425℃)and a wide optical transparency window(0.33-6.5μm),while Pb_(3)(TeO_(3))Br_(4) exhibits an second harmonic generation response approximately equivalent to that of KDP,appropriate birefringence(0.095@532 nm and 0.066@1064 nm),wide optical transparency window(0.33-6.5μm)and high thermal stability(522℃).These results indicated that lead tellurite bromides could be promising nonlinear optical material systems in the mid-IR wavelength.展开更多
Novel chalcogenide glasses of pseudo-binary(100-x)Sb_(2)S_(3-x)CuI systems were synthesized by traditional meltquenching method.The glass-forming region of Sb_(2)S_(3)-CuI system was determined ranging from x=30 mol%t...Novel chalcogenide glasses of pseudo-binary(100-x)Sb_(2)S_(3-x)CuI systems were synthesized by traditional meltquenching method.The glass-forming region of Sb_(2)S_(3)-CuI system was determined ranging from x=30 mol%to 40 mol%.CuI acts as a non-bridging modifier to form appropriate amount of[SbSI]structural units for improving the glass-forming ability of Sb_(2)S_(3).Particularly,as-prepared glassy sample is able to transmit light beyond 14μm,which is the wider transparency region than most sulfide glasses.Their physical properties,including Vickers hardness(Hv),density(ρ),and ionic conductivity(σ)were characterized and analyzed with the compositional-dependent Raman spectra.These experimental results would provide useful knowledge for the development of novel multi-spectral optical materials and glassy electrolytes.展开更多
In recent years,there has been a growing interest and research focus on infrared optical thin films as essential components in infrared optical systems.In practical applications,extreme environmental factors such as a...In recent years,there has been a growing interest and research focus on infrared optical thin films as essential components in infrared optical systems.In practical applications,extreme environmental factors such as aerodynamic heating and mechanical stresses,electromagnetic interferences,laser interferences,sand erosions,and rain erosions all lead to issues including cracking,wrinkling,and delaminations of infrared thin films.Extreme application environment imposes stringent requirements on functional films,necessitating high surface hardness,stability,and adhesion.Additionally,for multispectral optical transmissions,infrared optical thin films are expected to exhibit high transmittance in the visible and far-infrared wavelength bands while possessing tunability and optical anti-reflection properties in specific wavelength ranges.Electromagnetic shielding requires superior electrical performance,while resisting laser interference demands rapid phase change capabilities.This paper focuses on current research progresses in infrared optical thin films under extreme conditions such as opto,electro,thermos and mechanical environments.Table of Contents Graphic gives detailed outline.Future opportunities and challenges are also highlighted.展开更多
In the present work, hybrid sintering technique which couples the resistive heating and microwave heating is employed to sinter infrared transparent La0.15Y1.85O3 to 99.2% of the theoretical density for the first time...In the present work, hybrid sintering technique which couples the resistive heating and microwave heating is employed to sinter infrared transparent La0.15Y1.85O3 to 99.2% of the theoretical density for the first time to the best of our knowledge. The presence of La3+ in the yttria matrix improves the hardness properties to a greater extent without affecting the transmittance properties, but there is a deterioration in the thermal properties of the sample. So we have limited our studies to La0.15Y1.85O3 which shows better optical, thermal, and hardness properties. The pellets fabricated from the ultra-fine nano powder with average particle size of ~12 nm synthesized by combustion technique and sintered at 1430 ℃ with an average grain size of 0.22 μm show ~80.1% transmittance in the UV–visible region and 81% in mid infrared region. For a comparative study of the optical, mechanical, and thermal properties, two other variants of sintering strategies namely conventional sintering and microwave sintering are also employed. A comprehensive analysis on the hardness reveals that the hardness of the pellets sintered via hybrid heating is 9.73 GPa and is superior to the pellets sintered using the other two techniques. The thermal conductivity of the sample is also analyzed in detail. The results clearly indicate that the La0.15Y1.85O3 ultra-fine nano powder synthesised by the single-step combustion method and sintered via microwave hybrid heating shows better transmittance properties without compromising the mechanical properties, and can be used very effectively for the fabrication of infrared transparent windows and domes.展开更多
基金Project supported by the National Natural Science Foundation of China (Grant No 20671043)
文摘This paper reports that two kinds of polymers with high infrared transparency and good mechanical and physical properties have been prepared.An internal standard method is used to evaluate the infrared transparency of the binders.The physical and mechanical properties of the binders are measured according to corresponding standards. The results show the absorbance of polymer A in 8-14 μm range is 26% that of the ethylene-vinyl acetate copolymer （EVA）,and polymer B is 9% that of the EVA correspondingly.The film of polymer A shows good flexibility of above 1 mm,a hardness of grade 1,and adhesion of grade 2.The film of polymer B shows good flexibility of above 1 mm,a hardness of grade 1,and adhesion of grade 1.
基金financially supported by the National Natural Science Foundation of China(Grant No.52002273,51972229,61835014 and 51890864)National Key R&D Program of China(2021YFA0717800).
文摘Polymorphism is crucial for unraveling crystallization mechanisms,predicting crystal structures and discovering novel materials.A new high-symmetry polymorph of Li_(2)TeMo_(3)O_(12),β-Li_(2)TeMo_(3)O_(12),was identified successfully by a spontaneous crystallization technique,and it exhibits improved thermal stability and crystallizes in the trigonal space group R3(No.148)in contrast to the metastable α-Li_(2)TeMo_(3)O_(12).Thermal analysis and variable-temperature X-ray diffraction powder patterns demonstrated an irreversible phase transition of Li_(2)TeMo_(3)O_(12)from α-Li_(2)TeMo_(3)O_(12)to β-Li_(2)TeMo_(3)O_(12).High-quality and centimetre-sized single crystals of β-Li_(2)TeMo_(3)O_(12)were extracted via a facile flux approach.Moreover,optical characterization showed that it has a large bandgap of 3.05 eV accompanied by high transparency from 0.34 to 5.4μm,encompassing a 3-5μm atmospheric window.Remarkably,the title compound features the intriguing merits of an intrinsically strong Raman shift located at 955 cm^(−1) and a narrow line width of 12.54 cm^(−1),which enable it to act as a stimulated Raman laser,making it a promising mid-infrared Raman crystal.Additionally,theoretical investigations are used to evaluate the fundamental relationships between the compound’s structure and optical properties.
基金supported by the National Natural Science Foundation of China(Grant No.22222510,21975255 and 21921001)Natural Science Foundation of Fujian Province(2021J01514)+2 种基金the Foundation of Fujian Science&Technology Innovation Laboratory(2021ZR202)Youth Innovation Promotion Association CAS(2019303)Open Project of State Key Laboratory of Crystal Materials,Shandong University(KF1907).
文摘A non-centrosymmetric metal-free thiophosphate,γ-P_(4)S_(3)I_(2),was successfully synthesized utilizing polymorphism strategy in this study.γ-P_(4)S_(3)I_(2)crystallized in the space group of P4_(3)and featured paralleled(P_(4)S_(3)I_(2))_(n)molecular clusters.Importantly,it exhibited promising nonlinear optical(NLO)performances,such as a phase-matchable second harmonic generation(SHG)efficiency(0.5×AgGaS_(2)),wide band gap(2.38 eV),large birefringence(0.118@2050 nm),and wide infrared transparency,suggesting thatγ-P_(4)S_(3)I_(2)may be a potential IR NLO candidate.
基金supported by the National Natural Science Foundation of China(Grant No.22031009,22375201,21921001 and 91963105)the NSF of Fujian Province(Grant No.2023J01216).
文摘Herein,we report two new selenite/tellurite bromide compounds,namely,CdPb_(8)(SeO_(3))_(4)Br_(10) and Pb_(3)(TeO_(3))Br_(4).The former crystallized in a centrosymmetric space group,while the latter is a non-centrosymmetric compound.Specifically,CdPb_(8)(SeO_(3))_(4)Br_(10) demonstrates high thermal stability(425℃)and a wide optical transparency window(0.33-6.5μm),while Pb_(3)(TeO_(3))Br_(4) exhibits an second harmonic generation response approximately equivalent to that of KDP,appropriate birefringence(0.095@532 nm and 0.066@1064 nm),wide optical transparency window(0.33-6.5μm)and high thermal stability(522℃).These results indicated that lead tellurite bromides could be promising nonlinear optical material systems in the mid-IR wavelength.
基金Project partially supported by the National Key Research and Development Program of China(Grant Nos.2016YFB0303802 and 2016YFB0303803)the National Natural Science Foundation of China(Grant No.61775110)sponsored by K C Wong Magna Fund in Ningbo University。
文摘Novel chalcogenide glasses of pseudo-binary(100-x)Sb_(2)S_(3-x)CuI systems were synthesized by traditional meltquenching method.The glass-forming region of Sb_(2)S_(3)-CuI system was determined ranging from x=30 mol%to 40 mol%.CuI acts as a non-bridging modifier to form appropriate amount of[SbSI]structural units for improving the glass-forming ability of Sb_(2)S_(3).Particularly,as-prepared glassy sample is able to transmit light beyond 14μm,which is the wider transparency region than most sulfide glasses.Their physical properties,including Vickers hardness(Hv),density(ρ),and ionic conductivity(σ)were characterized and analyzed with the compositional-dependent Raman spectra.These experimental results would provide useful knowledge for the development of novel multi-spectral optical materials and glassy electrolytes.
基金funded by the following grants:the National Natural Science Foundation for Distinguished Young Scholars of China(Grant No.51625201)the Key Project of National Natural Science Foundation of China(Grant No.52032004).
文摘In recent years,there has been a growing interest and research focus on infrared optical thin films as essential components in infrared optical systems.In practical applications,extreme environmental factors such as aerodynamic heating and mechanical stresses,electromagnetic interferences,laser interferences,sand erosions,and rain erosions all lead to issues including cracking,wrinkling,and delaminations of infrared thin films.Extreme application environment imposes stringent requirements on functional films,necessitating high surface hardness,stability,and adhesion.Additionally,for multispectral optical transmissions,infrared optical thin films are expected to exhibit high transmittance in the visible and far-infrared wavelength bands while possessing tunability and optical anti-reflection properties in specific wavelength ranges.Electromagnetic shielding requires superior electrical performance,while resisting laser interference demands rapid phase change capabilities.This paper focuses on current research progresses in infrared optical thin films under extreme conditions such as opto,electro,thermos and mechanical environments.Table of Contents Graphic gives detailed outline.Future opportunities and challenges are also highlighted.
文摘In the present work, hybrid sintering technique which couples the resistive heating and microwave heating is employed to sinter infrared transparent La0.15Y1.85O3 to 99.2% of the theoretical density for the first time to the best of our knowledge. The presence of La3+ in the yttria matrix improves the hardness properties to a greater extent without affecting the transmittance properties, but there is a deterioration in the thermal properties of the sample. So we have limited our studies to La0.15Y1.85O3 which shows better optical, thermal, and hardness properties. The pellets fabricated from the ultra-fine nano powder with average particle size of ~12 nm synthesized by combustion technique and sintered at 1430 ℃ with an average grain size of 0.22 μm show ~80.1% transmittance in the UV–visible region and 81% in mid infrared region. For a comparative study of the optical, mechanical, and thermal properties, two other variants of sintering strategies namely conventional sintering and microwave sintering are also employed. A comprehensive analysis on the hardness reveals that the hardness of the pellets sintered via hybrid heating is 9.73 GPa and is superior to the pellets sintered using the other two techniques. The thermal conductivity of the sample is also analyzed in detail. The results clearly indicate that the La0.15Y1.85O3 ultra-fine nano powder synthesised by the single-step combustion method and sintered via microwave hybrid heating shows better transmittance properties without compromising the mechanical properties, and can be used very effectively for the fabrication of infrared transparent windows and domes.
