CONTENT
INTRODUCTION ..................................................................................................... 11 1. CHALCOGENIDE COMPOUNDS ....................................................................... 12 1.1. Sulfides, selenides, tellurides ...................................................................................12 Mixed chalcogenides ..................................................................................15 Multicentric chalcogenides ........................................................................17 References ...................................................................................................18 2. IONIC CHALCOGENIDES .................................................................................. 19 2.1. Chalcogenides of alkali metals ................................................................................19 2.1.1. Lithium chalcogenides ...............................................................................19 2.1.1.1. Lithium sulfides ............................................................................19 2.1.1.2. Lithium selenide............................................................................21 2.1.1.3. Lithium tellurides..........................................................................21 2.1.2. Sodium chalcogenides ................................................................................21 2.1.2.1.Sodium sulfides ..............................................................................21 2.1.2.2. Sodium selenides ..........................................................................24 2.1.2.3. Sodium tellurides ..........................................................................25 2.1.3. Potassium chalcogenides............................................................................26 2.1.3.1. Potassium sulfides ........................................................................26 2.1.3.2. Potassium selenides ......................................................................27 2.1.3.3. Potassium tellurides ......................................................................29 2.1.4. Rubidium chalcogenides ............................................................................30 2.1.4.1. Rubidium sulfides .........................................................................30 2.1.4.2. Rubidium selenides .......................................................................32 2.1.4.3. Rubidium tellurides ......................................................................33 2.1.5. Cesium chalcogenides ................................................................................35 2.1.5.1. Cesium sulfides .............................................................................35 2.1.5.2. Cesium selenides...........................................................................36 2.1.5.3. Cesium tellurides ..........................................................................38 2.1.6. Francium chalcogenides .............................................................................39 2.2. Chalcogenides of alkaline earth metals ..................................................................39 2.2.1. Beryllium chalcogenides .............................................................................39 2.2.1.1. Beryllium sulfide ...........................................................................39 2.2.1.2. Beryllium selenide .........................................................................40
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