http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
properties, processing, and applications
"Present-day interest in pyrochlore materials is immense. Academic and industrial researchers working with pyrochlore materials need a fundamental understanding of what pyrochlores are and their potential applications. Pyrochlore Ceramics: Properties, Processing, and Applications provides key knowledge and information needed on pyrochlore materials. With an emphasis on recent research developments, the contents review a broad spectrum of pyrochlore systems, focusing on their structures, their successful synthesis, multifaceted properties, and applications. The book brings all aspects together and presents recent research findings on pyrochlore materials. It will be the definitive text for all researchers who aim to venture into the eclectic world of pyrochlores. In addition, the book will be of interest to researchers who are already working on pyrochlore materials, providing them with novel information on the uncommon virtues of pyrochlore systems."--
Intro -- Pyrochlore Ceramics: Properties, Processing, and Applications -- Copyright -- Dedication -- Contents -- List of contributors -- Biographies -- Preface -- Section 1: Process and structure of pyrochlores -- Chapter 1: Crystal chemistry and phase transitions in pyrochlore and related structures -- 1.1. Introduction -- 1.2. Fluorite supergroup -- 1.3. Pyrochlore supergroup -- 1.3.1. Pyrochlore group -- 1.3.2. Microlite group -- 1.3.3. Roméite group -- 1.3.4. Elsmoreite group -- 1.3.5. Unassigned members -- 1.3.6. Betafite group -- 1.4. Weberite group -- 1.5. Zirconolite group -- 1.6. Ingersonite -- 1.7. Murataite-(Y) -- 1.8. Pittongite -- 1.9. Phyllotungstite -- 1.10. Allendeite -- Acknowledgments -- References -- Chapter 2: Crystal growth of magnetic pyrochlore oxides and their structure-property correlations -- 2.1. Introduction -- 2.2. Pyrochlore structure -- 2.3. Crystal growth of pyrochlores -- 2.3.1. Crystal growth techniques -- 2.3.1.1. Optical floating zone method -- 2.3.1.2. High-temperature solution growth method -- 2.3.2. Crystal growth of some specific pyrochlore families -- 2.3.2.1. Titanates -- 2.3.2.2. Zirconates -- 2.3.2.3. Molybdates -- 2.3.2.4. Iridates -- 2.4. Structure-property correlations -- 2.4.1. Titanates -- 2.4.1.1. Tb2Ti2O7 -- 2.4.1.2. Dy2Ti2O7 and Ho2Ti2O7 -- 2.4.1.3. Yb2Ti2O7 -- 2.4.1.4. Sm2Ti2O7 -- 2.4.2. Zirconates -- 2.4.2.1. Nd2Zr2O7 -- 2.4.2.2. Pr2Zr2O7 -- 2.4.2.3. Sm2Zr2O7 -- 2.4.2.4. Dy2Zr2O7and Er2Zr2O7 -- 2.4.3. Molybdates -- 2.4.4. Iridates -- 2.4.4.1. Specific difficulties in controlling the stoichiometry of pyrochlore iridates -- 2.4.4.2. Stuffing studies in the pyrochlore iridates -- 2.4.4.3. Doping studies in the pyrochlore iridates -- Filling control -- Bandwidth control -- Miscellaneous doped sample -- 2.5. Conclusions and perspectives -- Acknowledgments -- References.
Chapter 3: Raman spectroscopy study of disorder phenomena and size effects in pyrochlores -- 3.1. Introduction -- 3.1.1. The A2B2O(1)6O(2) pyrochlore structure -- 3.1.2. Ionic radii and pyrochlore stability -- 3.2. The Raman spectrum of ordered pyrochlores -- 3.2.1. Group theory and mode assignment -- 3.2.2. Raman spectra of well-ordered pyrochlores (BTi, Sn) -- 3.2.3. Wavenumber and atomic displacement calculations -- 3.2.4. Other features of ordered-pyrochlore spectra -- 3.2.4.1. Second-order excitations -- 3.2.4.2. Anharmonic effects -- 3.2.4.3. Crystal field transitions -- 3.3. Disordered pyrochlores -- 3.3.1. Defect energetics and the pyrochlore to fluorite transition -- 3.3.2. Examples of Raman spectra of disordered pyrochlores -- 3.3.2.1. Positional disorder in R2B2O7 (BZr, Hf) compounds -- 3.3.2.2. Positional and chemical disorder in A-site solid solutions -- 3.3.2.3. Positional and chemical disorder in B-site solid solutions -- 3.3.2.4. Disorder-activated modes and relation with atomic distribution -- 3.3.2.5. Nonstoichiometric compounds -- 3.3.3. SRO domains -- 3.3.4. Disorder as a response to high-energy stimuli and nonequilibrium situations -- 3.3.4.1. High temperature -- 3.3.4.2. Irradiation -- 3.3.4.3. High pressure -- 3.3.4.4. Disorder and size-effects in as-grown materials -- 3.4. Summary and conclusions -- References -- Chapter 4: Effect of different fabrication avenues of pyrochlore ceramics toward order-disorder transitions -- 4.1. Introduction -- 4.2. Chemical synthesis techniques -- 4.2.1. Solid state method -- 4.2.2. Coprecipitation method -- 4.2.3. Sol-gel synthesis -- 4.2.4. Pechini method -- 4.2.5. Hydrothermal method/solvothermal synthesis -- 4.2.6. Molten salt synthesis method -- 4.2.7. Combustion method -- 4.3. Conclusions -- Acknowledgments -- References.
Chapter 5: Process-structure correlations in complex A2B2O7 systems: Nanoparticles and ceramics -- 5.1. Introduction -- 5.2. Order-disorder transition -- 5.3. Distinguishing defect fluorite and pyrochlore phases -- 5.4. Pyrochlores with different elemental systems -- 5.4.1. Pyrochlores containing cerium (Ce) -- 5.4.2. Zirconate pyrochlores -- 5.4.2.1. Lanthanum zirconate (La2Zr2O7) -- 5.4.2.2. Role of dopants in LZ system -- 5.4.2.3. Gadolinium zirconate (Gd2Zr2O7) -- 5.4.2.4. Neodymium zirconate (Nd2Zr2O7) -- 5.4.2.5. Yttrium zirconate (Y2Zr2O7) -- 5.4.2.6. Other zirconate pyrochlores -- 5.4.3. Hafnate pyrochlores -- 5.4.4. Stannate pyrochlores -- 5.4.5. Iridate pyrochlores -- 5.5. Sintering resistance of pyrochlores -- 5.6. High-entropy pyrochlore ceramics -- 5.7. Summary and conclusions -- 5.7.1. Structure and crystal chemistry of pyrochlores -- 5.7.2. Characterization issues with pyrochlore structures -- 5.7.3. Synthesis and processing of pyrochlores -- 5.7.4. Different families of pyrochlores -- 5.7.5. Pyrochlores for TBC applications -- References -- Section 2: Functional properties of pyrochlore systems -- Chapter 6: Electrochemical properties of complex pyrochlores -- 6.1. Introduction -- 6.2. General aspects of pyrochlore-type oxide conductivity -- 6.3. Structural disordering. Defects. Oxygen migration pathways -- 6.4. Regulation of electrochemical behavior of oxide pyrochlores by doping -- 6.4.1. Doping into A-sites -- 6.4.2. Doping into B-sites -- 6.4.3. Doping into A- and B-sites -- 6.5. Electrochemical behavior of complex pyrochlores based on niobates, tantalates, antimoniate -- 6.6. Potential electrochemical applications of complex oxide pyrochlores -- 6.6.1. Potential cathodic and anodic materials (or electrode materials for SOFC) based on complex pyrochlores -- 6.6.2. Oxygen electrocatalysts -- 6.6.3. Proton conductivity.
6.7. Conclusions -- References -- Chapter 7: Ionic conductivity in materials with a pyrochlore structure -- 7.1. Introduction -- 7.2. Impedance instrumentation -- 7.3. Synthesis of pyrochlores -- 7.4. Conductivity of pyrochlores -- 7.4.1. Titanate pyrochlores -- 7.4.2. Zirconate pyrochlores -- 7.4.3. Hafnate and stannate pyrochlores -- 7.4.4. Niobate and tantalate pyrochlores -- 7.4.5. Molybdate pyrochlores -- 7.4.6. Conductivity of irradiated samples -- 7.4.7. Cationic conductivity in pyrochlores -- 7.4.8. Proton conductivity -- 7.5. Summary and future scope -- References -- Chapter 8: Nonferroelectric relaxor dielectric properties of pyrochlore phases -- 8.1. Introduction -- 8.2. Crystal structure -- 8.3. Ferroelectricity? -- 8.4. Dielectric relaxation -- 8.5. Conclusions -- Acknowledgments -- References -- Chapter 9: Unusual magnetic properties of ternary Bi- and Ln-containing pyrochlores: From cooperative paramagnetism to -- 9.1. Introduction -- 9.1.1. Overview -- 9.1.2. Theoretical background, cooperative paramagnetism, frustration factor -- 9.1.3. Spin glass -- 9.1.4. Cluster glass -- 9.1.5. Reentrant spin glass -- 9.2. Experimental results -- 9.2.1. The Bi/Ln-Fe-Nb/Sb/Te-O (Ln=La, Pr) pyrochlores -- 9.2.2. The A-Mn-O (A=Tl, Y, In, Lu, or Ln and Bi-Mn/M-O (M=Nb, Sb) pyrochlores -- 9.2.3. The Ln/Bi-Ni/Co-Sb/Nb-O pyrochlores -- 9.2.4. The Ln/Bi-Cr-Sb-O (A=Tl, Y, In, and Lu) and Ln2CrTaO7 (Ln=Y, Sm, Gd) pyrochlores -- 9.3. Discussion -- 9.4. Conclusions -- Acknowledgment -- References -- Chapter 10: Pyrochlores: Prospects as a photocatalyst for environmental and energy applications -- 10.1. Introduction -- 10.2. Pyrochlores -- 10.3. Pyrochlore composition, structure, and diversity -- 10.4. Properties of pyrochlore-type materials -- 10.5. Photocatalysis -- 10.5.1. Bandgap and defects -- 10.6. Photodegradation of organic pollutants.
10.7. Water splitting -- 10.8. CO2 reduction -- 10.9. Summary -- References -- Chapter 11: Photoluminescence in pyrochlore structures -- 11.1. Introduction -- 11.1.1. Luminescence -- 11.1.2. Basics of luminescence -- 11.1.3. Energy transfer -- 11.1.4. Applications -- 11.1.4.1. LED applications -- 11.1.4.2. Temperature sensors -- 11.1.4.3. Biomedical applications -- 11.1.4.4. Agriculture applications -- 11.2. Photoluminescence in pyrochlore structures -- 11.2.1. Importance of host matrix for photoluminescence -- 11.2.2. Pyrochlore structure as a host for photoluminescence -- 11.2.3. Photoluminescence studies of Eu3+-activated binary type pyrochlore systems: RE2M2O7(RE=Y, La, Gd, Lu -- M=Ti, Zr, H ... -- 11.2.3.1. Eu3+ ion activator -- 11.2.3.2. Effects of A- and B-site cations -- 11.2.3.3. Structural transformation -- 11.2.3.4. Particle size control -- 11.2.3.5. Defect concentration control -- 11.2.4. Maneuverability of photoluminescence in quaternary Pyrochlore system: CaREMNbO7 -- RE=Y, La, Gd -- M=Sn, Ti -- 11.2.4.1. Distortion factor -- 11.2.4.2. Doping effect -- 11.2.4.3. Role of electronegativity of cations -- 11.2.4.4. Order/disorder control -- 11.2.5. Photoluminescence studies in displaced pyrochlore -- 11.3. Conclusions and future outlook -- References -- Section 3: Diverse applications of pyrochlore materials -- Chapter 12: Transparent ceramics based on pyrochlores -- 12.1. Introduction -- 12.2. Fabrication of transparent ceramics based on pyrochlores -- 12.2.1. Synthesis methods of pyrochlore powders for transparent ceramics -- 12.2.2. Sintering techniques for transparent ceramics based on pyrochlores -- 12.3. Transparent ceramic materials based on pyrochlores -- 12.3.1. A2B2O7 pyrochlores and A-site substituted A2B2O7 pyrochlores -- 12.3.1.1. Titanate compounds -- 12.3.1.2. Zirconate compounds -- 12.3.1.3. Hafnate compounds.
[S.l.] : ELSEVIER - HEALTH SCIENCE, 2022
Elsevier series on advanced ceramic materials