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This Special Issue of Crystals contains papers focusing on various properties of conducting ceramics. Multiple aspects of both the research and application of this group of materials have been addressed. Conducting ceramics are the wide group of mostly oxide materials which play crucial roles in various technical applications, especially in the context of the harvesting and storage of energy. Without ion-conducting oxides, such as yttria-stabilized zirconia, doped ceria devices such as solid oxide fuel cells would not exist, not to mention the wide group of other ion conductors which can be applied in batteries or even electrolyzers, besides fuel cells. The works published in this Special Issue tackle experimental results as well as general theoretical trends in the field of ceramic conductors, or electroceramics, as it is often referred to.

n/a --- ionic conductivity --- cation mixing --- aliovalent substitution --- substituted barium indate --- thermal expansion --- impregnation --- Cr substitution --- chemical expansion --- ball milling --- lanthanum orthoniobate --- perovskite oxides --- thermogravimetric analysis --- Hebb-Wagner measurements --- samarium-doped ceria (SDC) --- impedance spectroscopy --- hydration --- nanocrystalline ceramics --- binary fluorides --- Ni-Cr-ferrite --- solid oxide fuel cells (SOFC) --- Mössbauer --- ceria --- current collector --- multifoil shape --- specific surface area of powders --- sol-gel --- molten salt synthesis --- Wulff shape --- relaxation experiments --- Ostwald ripening --- Solid Oxide Fuel Cells --- electronic conductivity --- proton ceramic fuel cells --- terbium orthoniobate --- water uptake --- high temperature proton conductors --- redox cycle --- metal foam --- protonic conductors --- protonic conductivity --- proton conductivity --- structure --- thin films --- e-beam physical vapor deposition --- TEC --- magnetic properties --- CTE --- coupled/decoupled ionic transport --- platelet morphology --- bismuth vanadate --- La-doped SrTiO3 --- Mössbauer

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This work covers all aspects related to the obtainment, production, design, and processing of biopolymers obtained from natural resources. Moreover, it studies characteristics related to the improvement of their performance to increase their potential application at an industrial level, in line with the concept of a global circular economy. Thus, this work firstly classifies biopolymers obtained from natural resources (e.g., biobased building blocks and biopolymers extracted directly from plants and biomass), and then summarizes several cutting-edge research works focused on enhancing the performance of biopolymers from natural resources to extend their application in the industrial sector, and contribute to the transition to more sustainable plastics.

Technology: general issues --- History of engineering & technology --- PHBH --- almond shell flour --- mechanical properties --- thermal characterization --- WPCs --- bacterial polyesters --- poly(3-hydroxybutyrate-co-3hydroxyhexanoate)—PHBH --- poly(ε-caprolactone)—PCL --- binary blends --- improved toughness --- mechanical and thermal characterization --- Cucumis metuliferus --- extraction --- antioxidant activity --- coating --- cellulose acetate --- LDPE --- bilayer packaging --- active packaging --- poly(lactic acid) --- mechanical recycling --- yerba mate --- bionanocomposites --- polysulfide-derived polymers --- cottonseed oil --- fatty acid of cottonseed oil --- sodium soap of cottonseed oil --- PLA --- nanocomposites --- functional properties --- thymol --- migration --- films --- cutin --- cuticles --- bioplastics --- biopolymers --- solanum: CPMAS 13C NMR --- softgels --- mucilage --- in vitro digestion --- bioaccessibility --- bran content --- plasticized wheat flour --- citric acid --- biobased blends --- biopolymer --- carboxymethyl cellulose --- solid polymer electrolyte --- ionic transport --- chitosan --- potato starch --- microwave --- foam --- orthogonal experiments --- empty fruit bunch --- regenerated cellulose --- ionic liquid --- methyl methacrylate --- 3D printing --- syringe extrusion 3D printing --- hydroxypropyl methylcellulose --- orodispersible film --- phenytoin --- PA610 --- halloysite nanotubes (HNTs) --- flame retardant --- cone calorimeter --- agricultural waste --- asparagus --- CMC --- degree of substitution --- DS --- cellulose extraction --- thermoplastic starch --- dolomite --- biocomposite --- sonication --- bacterial cellulose --- nata de coco --- sodium hydroxide --- lignin --- nanoparticles --- biorefinery --- organosolv pretreatment --- polyelectrolyte multi-layers --- sodium alginate --- k-carrageenan --- cellulosic nonwoven textile --- surface functionalization --- characterization --- bio-sorption --- isotherms --- natural fibers --- soy protein --- chitin --- coir --- comfort --- functional textiles --- Circular Bioeconomy --- carbonation reaction --- selectivity optimization --- carbonated epoxidized linseed oil --- non-isocyanate polyurethane --- argan shell particles --- wood plastic composite --- polyethylene --- compatibilization --- air permeability --- fungal fibers --- hemp fibers --- microstructure --- mycocel --- softwood fibers --- virus membrane filtration --- allotropic transition --- choline chloride --- plasticizer --- starch dissolution --- n/a --- poly(3-hydroxybutyrate-co-3hydroxyhexanoate)-PHBH --- poly(ε-caprolactone)-PCL