The polarizability model for ferroelectricity in perovskite oxides

This article reviews the polarizability model and its applications to ferroelectric perovskite oxides. The motivation for the introduction of the model is discussed and nonlinear oxygen ion polarizability effects and their lattice dynamical implementation outlined. While a large part of this work is dedicated to results obtained within the self-consistent-phonon approximation (SPA), also nonlinear solutions of the model are handled which are of interest to the physics of relaxor ferroelectrics, domain wall motions, incommensurate phase transitions. The main emphasis is to compare the results of the model with experimental data and to predict novel phenomena.Comment: 55 pages, 35 figure

Chemical Bonding in Solids

This chapter discusses the various classes of hydride compounds, with a special focus on saline and metallic hydrides as well as oxyhydrides. It includes the following topics: thermodynamic stability, crystal chemistry, synthesis, and physical properties. The chapter also highlights recent progress in understanding hydride ion mobility in alkaline earth hydrides. It further deals with hydride compounds and in particular those containing alkali, alkaline earth, and transition and rare earth metals. The saline hydrides, that is, AH and AeH2 (with A=Li, Na, K, Rb, and Cs; Ae=Mg, Ca, Sr, and Ba) are proper ionic materials, in which hydrogen is present as hydride anions, H−. Saline hydrides show many similarities with their halide analogues, especially concerning crystal and electronic structures and, perhaps to a lesser extent, physical attributes such as brittleness, hardness, and optical properties

Ueber die Prüfung der Magnesia sulfurica auf Alkaligehalt

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Resiliency on the home front : addressing the needs of family and friends of unmarried military members during deployment

This study was undertaken to explore the needs of family and close friends of unmarried military members. Unmarried military members depend on parents, relatives, siblings, significant others, and close friends for support during deployments, however there is limited research available on the needs of this population. The main research question was: What are the needs of family and close friends of unmarried military members during deployment? A questionnaire was used to recruit participants through Facebook military communities and online military community forums. There were 33 total participants who were asked to identify an unmarried military member with whom they had a relationship with and who had been deployed to Iraq or Afghanistan. They were also asked to answer questions about community and military resources used, barriers to accessing resources, and what they would want improved, expanded or created in terms of resources. The findings of this research suggest four major findings: Participants are restricted in accessing military resources because they do not meet the military\u27s definition of family, participants reported living too far away from resources to use them and that they often do not know how to find available resources, participants want more available resources that provide support and shared experiences, and lastly same-sex partners do not trust available resources and want a safe space to have their needs met. A gap exists in current research that does not look at the needs of the support system for unmarried military members