**Microwave Fast Sintering of Double Perovskite Ceramic Materials**

microstructure, along with distinctive properties. The effects of foam precursor suspensions – bubble size, distribution, contact angle, and surface tension – on the resultant porous ce‐ ramics' mechanical and physical properties are assessed in this chapter. Control of these pa‐ rameters can allow the tailoring of the microstructures of porous ceramics produced by

**In Chapter 4, Electrochemical Synthesis of Rare Earth Ceramic Oxide Coatings**, Teresa D. Golden's team discussed in detail the electrolytic and direct electrodeposition for the pro‐ duction of rare earth oxide coatings, such as gadolinium, terbium, samarium, neodymium, europium, and dysprosium oxides. Direct electrodeposition occurs when there is a direct oxidation or reduction (exchange of electrons) between the metal ion or metal ion complex and electrode to produce the metal oxide on the surface. The physical and chemical proper‐ ties of the electrodeposited oxides were characterized by XRD, SEM, and XPS techniques. The mechanisms of electrodeposition for rare earth oxides are discussed in detail. As a re‐ sult, a variety of morphologies have been obtained for the REO films, such as nanocrystal‐ line films, nanorods, nanotubes, nanosheets, as well as flower-like and coral-like

**In Chapter 5, Thermal Barrier Coatings: An Overview**, Sumana Ghosh provided an over‐ view on the thermal barrier coating (TBC) requirement, application of TBCs, degradation mechanisms, different processing techniques used for preparation of TBCs, and their ther‐ mal properties. As a result, TBCs are required to be more suitably designed for the thermal protection of gas turbine engine components to increase engine operating temperatures, fuel efficiency, and engine reliability significantly. However, coating durability is a vital factor to increase the engine operating temperature. Therefore, the coating behavior and failure modes under high temperature and high thermal gradient cyclic conditions should be prop‐

**In Chapter 6, Electrocaloric Properties of PLZT and BaTiO3 Ceramics**, Hiroshi Maiwa stud‐ ied the electrocaloric temperature change of the PLZT ceramics and BaTiO3 ceramics using direct measurements. The electrocaloric effect (ECE) is a phenomenon in which a material shows a reversible temperature change under an applied electric field. He concluded that the possibility of the approximately twice temperature change was obtained by introducing

**Adel Mohamed**

Qatar University, Qatar

erly understood to develop next-generation advanced TBCs.

9.1% La components in PZT ceramics.

direct foaming.

VIII Preface

nanostructures.

Penchal Reddy Matli, Adel Mohamed Amer Mohamed and Ramakrishna Reddy Rajuru

Additional information is available at the end of the chapter

http://dx.doi.org/10.5772/61026

#### **Abstract**

The book chapter mainly deals with the microwave sintering of high quality crystals of La2MMnO6 (M = Ni or Co) ceramics. Double perovskite La2MMnO6 (M = Ni or Co) ceramics with average particle size of ~65 nm were manufactured using microwave sintering at 90°C for 10 min in N2 atmosphere for the first time. The morphology, structure, composition, and magnetic properties of the prepared compacts were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), infrared spectroscopy (IR and FTIR), and physical properties measurement system (PPMS). The corresponding dielectric property was tested in the frequency range of 1 kHz–1 MHz and in the temperature range of 300–600 K, and the ceramics exhibited a relaxation-like dielectric behavior.

**Keywords:** ceramics, microwave sintering, microstructures, XPS, multiferroic prop‐ erties
