CaO–Al2O3–MgO–SiO2 (CAMS)‐based glass‐ceramics were prepared using body crystallization method. Adding Cr2O3 into the ceramics not only effectively lowered the crystallization temperature, but also led to significant grain refinement of diopside that crystallized in the CAMS glass‐ceramic after crystallization treatment at 900°C for 2 hours. Experimental work verified that the epitaxial growth of the diopside on the spinel particles, which formed during nucleation treatment when fabricating the glass‐ceramics, facilitated the heterogeneous nucleation of diopside on the spinel and refined the diopside. In addition, two energetically favored crystallographic orientation relationships between the epitaxial growth diopside and spinel were experimentally observed. They are //[001]diopside,////(200)diopside and //[101]diopside, (311)spinel//. These two novel results can be potentially used to develop new glass‐ceramic materials with improved performance. 相似文献
The cover image, by Yi Yang et al., is based on the Research Article Catalytic wet peroxide oxidation of m‐cresol over novel Fe2O3 loaded microfibrous entrapped CNT composite catalyst in a fixed‐bed reactor, DOI: 10.1002/jctb.5609 .
The cover image, by Ying Pei et al., is based on the Research Article Tannin‐immobilized cellulose microspheres as effective adsorbents for removing cationic dye (Methylene Blue) from aqueous solution, DOI: 10.1002/jctb.5121 .
The cover image, a 3D stationary salami structure of a green/red/black ternary polymer blend and the separated red and green continuous structure, is by QUI TRAN‐CONG‐MIYATA, based on the Editorial In Focus section: Polymer Research at KIT, Japan, DOI: 10.1002/pi.5248 .
The cover image, by Aloisius R Purnama et al., is based on the Research Article Coarse‐grained models for frontal photopolymerization with evolving conversion profile, DOI: 10.1002/pi.5344 .
The cover image, by Jae‐Hoon Jeong et al., is based on the Research Article Preparation and properties of poly(lactic acid)/lipophilized graphene oxide nanohybrids, DOI: 10.1002/pi.5478 .
The cover image, by Marianna Triantou et al., is based on the Research Article Mechanical performance of re‐extruded and aged graphene/polypropylene nanocomposites, DOI: 10.1002/pi.5353 .
Searching for layered MAX phase‐like materials with properties of both ceramics and metals is a topic in its infancy. Herein, through a combination of crystal structure, electronic structure, chemical bonding, and elastic property investigations, we report two MAX phase‐like layered materials Rh2YSi and Ir2YSi. Rh2YSi and Ir2YSi have bulk modulus B of 150 and 185 GPa, respectively, which are comparable to the typical MAX phases like Ti2AlC, Ti3AlC2, and Ti3SiC2, but much lower shear modulus G (82 and 97 GPa for Rh2YSi and Ir2YSi, respectively) than MAX phases. The high stiffness is due to the presence of rigid Si2–M–Si3–M (M = Ir, Rh) units, while the low shear deformation resistance is due to the presence of metallic bonds and the weak bonds that link the rigid Si2–M–Si3–M (M = Ir, Rh) units. Based on the low shear deformation resistance and low Pugh's ratio, Rh2YSi and Ir2YSi are predicted as damage‐tolerant silicides and promising water vapor‐resistant interphase materials for SiCf/SiC composites if yttria or yttrium silicates are formed to protect the SiC fibers in oxygen containing environments. The possible slip systems are {0001} <> and {} <0001> for both Rh2YSi and Ir2YSi. 相似文献
The cover image, by Gustavo Acosta‐Santoyo et al., is based on the Research Article Stimulation of the germination and growth of different plant species using an electric field treatment with IrO2‐Ta2O5|Ti electrodes, DOI: 10.1002/jctb.5517 .
The cover image, by Dirk W Schubert et al., is based on the Research Article Compressive and cyclic loading of silicone breast implants and their effect on shape resilience and reliability of the shell material, DOI: 10.1002/pi.5516 .
The cover image, by James Gardiner et al., is based on the Research Article 4‐Halogeno‐3,5‐dimethyl‐1H‐pyrazole‐1‐carbodithioates: versatile reversible addition fragmentation chain transfer agents with broad applicability, DOI: 10.1002/pi.5423 . Note: MAMs and LAMs are acronyms for more and less activated monomers.
The cover image, by Bruna A. Bregadiolli et al., is based on the Research Article Towards the synthesis of poly(azafulleroid)s: main chain fullerene oligomers for organic photovoltaic devices, DOI: 10.1002/pi.5419 .
Lead‐free MnO‐doped 0.955K0.5Na0.5NbO3‐0.045Bi0.5Na0.5ZrO3 (Abbreviated as KNN‐0.045BNZ) ceramics have been prepared by the conventional solid‐state sintering method in reducing atmosphere ( = 1 × 10?10 atm) and air. For ceramics sintered in reducing atmosphere, only Mn2+ ions exist in ceramics who preferentially occupy the cation vacancies in A‐site at x =0.2‐0.4, whereas Mn2+ ions substitute for Zr4+ ions in B‐site to form defects () at x >0.4. For ceramics sintered in air, mixed Mn2+, Mn3+, and Mn4+ ions coexist here. The Mn2+ ions preferentially occupy the cation vacancies in A‐site at x =0.2‐0.4 and then Mn2+ ions substitute for Zr4+ ions in B‐site at x >0.4. Meanwhile, the Mn3+ ions and Mn4+ ions substitute for Nb5+ ions in B‐site to form defects () at x =0.2‐0.8. The (, , and ) dipolar defects show a positive dipolar defect contribution (DDC) to the , whereas the dipolar defects () show a negative DDC to the . The dipolar defects ( ‐ and ) can help improve the temperature stability of . The 0.4% MnO‐doped KNN‐0.045BNZ ceramics sintered in reducing atmosphere show excellent piezoelectric constant d33 = 300 pC/N and 0.2% MnO‐doped KNN‐0.045BNZ ceramics sintered in air possess optimal piezoelectric constant d33 = 290 pC/N. 相似文献
The cover image, by Estefanía Sierra et al., is based on the Research Article Chemoenzymatic synthesis of poly(phenylene disulfides) with insulating properties and resistant to high temperatures, DOI: 10.1002/jctb.5290 .