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The crystal chemistry of spin crossover (SCO) behavior in coordination compounds can potentially be in association with smart materials—promising materials for applications as components of memory devices, displays, sensors and mechanical devices and, especially, actuators, such as artificial muscles. This Special Issue is devoted to various aspects of SCO and related research, comprising 18 interesting original papers on valuable and important SCO topics. Significant and fundamental scientific attention has been focused on the SCO phenomena in a wide research range of fields of fundamental chemical and physical and related sciences, containing the interdisciplinary regions of chemical and physical sciences related to the SCO phenomena. Coordination materials with bistable systems between the LS and the HS states are usually triggered by external stimuli, such as temperature, light, pressure, guest molecule inclusion, soft X-ray, and nuclear decay. Since the first Hofmann-like spin crossover (SCO) behavior in {Fe(py)2[Ni(CN)4]}n (py = pyridine) was demonstrated, this crystal chemistry motif has been frequently used to design Fe(II) SCO materials to enable determination of the correlations between structural features and magnetic properties.

n/a --- hexadentate ligand --- X-ray diffraction --- structural disorder --- lattice energy --- 2-bis(4-pyridyl)ethane --- thermal hysteresis --- optical conductivity spectrum --- spin-state crossover --- solvate --- single crystal --- spin-crossover transition --- spin-crossover --- cobalt oxide --- amorphous --- metal dithiolene complexes --- qsal ligand --- impurity effect --- 3-triazole --- intermolecular interactions --- spin crossover --- hydrogen bonding --- 1 --- 2 --- optical microscopy --- supramolecular coordination polymer --- paramagnetic ligand --- magnetic susceptibility --- high spin --- [Fe(III)(3-OMesal2-trien)]+ --- aminoxyl --- cobalt(II) ion --- mosaicity --- Fe(III) coordination complexes --- nitroxides --- C–H···? interactions --- Fe(II) --- dithiooxalato ligand --- dinuclear triple helicate --- coordination polymers --- magnetization --- spiral structure --- magnetostructural correlations --- charge-transfer phase transition --- structure phase transition --- magnetic properties --- spin polaron --- substitution of 3d transition metal ion --- iron(II) complexes --- X-ray absorption spectroscopy --- coordination complexes --- crystal engineering --- fatigability --- soft X-ray induced excited spin state trapping --- spin transition --- dipyridyl-N-alkylamine ligands --- coordination polymer --- iron (II) --- iron mixed-valence complex --- chiral propeller structure --- spin cross-over (SCO) --- EPR spectroscopy --- Cu(II) complexes --- solvent effects --- ferromagnetism --- SQUID --- LIESST effect --- low spin (LS) --- 57Fe Mössbauer spectroscopy --- dielectric response --- iron(II) --- hetero metal complex --- atropisomerism --- switch --- Schiff base --- counter-anion --- DFT calculation --- Fe(III) complex --- Fe(II) complex --- high spin (HS) --- reaction diffusion --- thermochromism --- supramolecular isomerism --- phase transition --- magnetic transition --- mononuclear --- [Au(dmit)2]? --- UV-Vis spectroscopy --- phase transitions --- ?-? interactions --- [Au(dddt)2]? --- crystal structure --- linear pentadentate ligand --- ion-pair crystals --- C-H···? interactions --- 57Fe Mössbauer spectroscopy

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This is a Special Issue of Metals devoted to aspects of Advances in Mineral Processing and Hydrometallurgy. This includes a global call for article submissions that also included Characterization along with Recycling and Waste Minimization. As such, both primary and recycled aspects will be considered. Possible specific topics included Mineralogy, Geometallurgy, Thermodynamics, Kinetics, Comminution, Classification, Physical Separations, Liquid–Solid Separations, Leaching, Solvent Extraction, Ion Exchange, Activated Carbon, Precipitation, Reduction, Process Economics and Process Control. Suggested application areas were in Gold, Silver, PGM’s, Aluminum, Copper, Zinc, Lead, Nickel, and Titanium. Critical Metals articles on topics such as Lithium, Antimony Tellurium, Gallium, Germanium, Cobalt, Graphite, Indium, and Rare Earth were also welcome. As such, this Special Issue of Metals was well supported by diverse submissions and the final publication of high-quality peer-reviewed articles.

BOS filter cakes --- butyric acid --- selective leaching --- leaching behaviors --- zinc --- iron --- chalcocite --- sulphide leaching --- copper --- reusing water --- desalination residue --- ecological treatment --- leaching --- black copper ore --- copper wad --- copper pitch --- comminution --- grinding circuit --- Swebrec function --- size distribution models --- modelling --- lateritic ore --- iron and steelmaking wastes --- alkalis --- aqueous treatment --- waste treatment --- reducing agent --- manganese --- viscoelasticity --- quartz --- kaolin --- seawater --- magnesium precipitates --- chalcopyrite concentrate --- hydrogen peroxide --- sulfuric acid --- leaching kinetics --- copper tailings --- rheology --- fractal aggregates --- thickening --- MnO2 --- acid media --- ANOVA --- dissolution --- arsenic --- trisulfide --- copper sulfate --- kinetics --- shrinking core model --- time-to-a-given-fraction kinetics analysis --- silica recovery --- column flotation --- mining waste --- waste reprocessing --- CuFeS2 --- chloride media --- manganese nodules --- thiosulfate --- gold leaching --- silver leaching --- kinetic analysis --- sedimentary ore --- diffusion control --- mixed control --- chalcopyrite --- ionic liquid --- bromide --- seawater flotation --- pyrite depression --- guar gum --- FBRM --- clay-based copper tailings --- fractal dimension --- mixing intensity --- population balance model --- seawater flocculation --- platinum-group metal --- metal precipitation --- ion-pair --- aliphatic primary amine --- hydrochloric acid --- enhanced flocculation --- water recovering --- magnesium removal --- shredded waste printed circuit boards --- precious metals --- bromine --- platinum group elements --- catalytic converters --- acidic fusion --- acidic leaching --- sulfation --- n/a --- nitrate --- gas scrubbing --- recovery --- gold --- refractory --- nitric acid --- microwave --- coal fly ash --- sandy grade alumina --- AlCl3·6H2O --- crystallization --- salting-out method --- gibbsite --- precipitation --- electric arc furnace dust --- monosodium glutamate --- ammonia leaching --- high-pressure leaching --- copper extraction --- silver extraction --- desilication --- malachite --- carbonate --- ammonium hydroxide --- heterogeneous model --- rare earth elements --- NdFeB permanent magnet --- hydrometallurgical --- electrodialysis (ED) --- lithium --- lithium-ion battery --- lithium sulfate --- multistage concentration (MSC) --- gold cyanide leaching --- sulfide minerals --- SART process --- cyanidation --- activated carbon --- metal–cyanide complex --- copper ore --- carbon in pulp (CIP), agitated tank --- cyanide complexes --- metal-cyanide complex