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<p>Preface ix</p> <p>Acknowledgements xi</p> <p><b>1 Introduction to Hybrid Organic–Inorganic Perovskites </b><b>1</b></p> <p>1.1 Perovskite Oxides 1</p> <p>1.2 Evolution from Perovskite Oxides to Hybrid Organic–Inorganic Perovskites 3</p> <p>1.3 Classification and Chemical Variations of HOIPs 4</p> <p>1.4 Structure, Symmetry, and Property Features of HOIPs 5</p> <p>1.4.1 General Trend 5</p> <p>1.4.2 Ion Radius Matchability and Tolerance Factor 7</p> <p>1.4.3 Phase Transitions 10</p> <p>References 12</p> <p><b>2 Hybrid Halide Perovskites </b><b>15</b></p> <p>2.1 Synthesis and Chemical Diversity 15</p> <p>2.2 Symmetries and Structures 19</p> <p>2.3 Phase Transitions 24</p> <p>2.4 Physical Properties 29</p> <p>2.4.1 Semiconductivity and Bandgap Structures 29</p> <p>2.4.2 Transport Properties and Photovoltaics 32</p> <p>2.4.3 Laser Physics 49</p> <p>2.4.4 Light-Emitting Diodes 54</p> <p>2.4.5 Photodetectors 59</p> <p>2.4.6 Ferroelectricity and Rashba Effect 63</p> <p>2.4.7 Mechanical Properties 66</p> <p>2.4.8 Thermal Conductivity 70</p> <p>2.4.9 Caloric Effects 71</p> <p>2.4.10 Other Properties and Applications 73</p> <p>References 73</p> <p><b>3 Hybrid Formate Perovskites </b><b>79</b></p> <p>3.1 Synthesis and Chemical Diversity 79</p> <p>3.2 Symmetries and Structures 82</p> <p>3.3 Phase Transitions and Order–Disorder 91</p> <p>3.4 Physical Properties 94</p> <p>3.4.1 Magnetism 94</p> <p>3.4.1.1 Spin-Canting and JT Effect 94</p> <p>3.4.1.2 Spin-Flop 98</p> <p>3.4.1.3 Quantum Tunnelling 101</p> <p>3.4.2 Dielectricity 102</p> <p>3.4.3 Ferroelectricity 105</p> <p>3.4.4 Ferroelasticity 114</p> <p>3.4.5 Multiferroicity 118</p> <p>3.4.6 Mechanical Properties 125</p> <p>3.4.7 Thermal Expansion 134</p> <p>3.4.8 Caloric Effects 139</p> <p>References 145</p> <p><b>4 Hybrid Azide Perovskites </b><b>151</b></p> <p>4.1 Synthesis and Structures 151</p> <p>4.2 Phase Transitions 156</p> <p>4.3 Physical Properties 164</p> <p>4.3.1 Magnetism 164</p> <p>4.3.2 Dielectricity 167</p> <p>4.3.3 Anti-ferroelectricity and Ferroelasticity 174</p> <p>4.3.4 Thermal Expansion 176</p> <p>4.3.5 Mechanical Properties 177</p> <p>References 178</p> <p><b>5 Hybrid Dicyanamide Perovskites </b><b>181</b></p> <p>5.1 Synthesis and Structures 181</p> <p>5.2 Phase Transitions 185</p> <p>5.3 Physical Properties 188</p> <p>5.3.1 Dielectricity 188</p> <p>5.3.2 Optical Properties and Second Harmonic Generation (SHG) Effects 190</p> <p>5.3.3 Magnetism 191</p> <p>5.3.4 Mechanical Properties and Thermal Expansion 193</p> <p>5.3.5 Caloric Effects 195</p> <p>References 197</p> <p><b>6 Hybrid Cyanide Perovskites </b><b>199</b></p> <p>6.1 Synthesis and Structures 199</p> <p>6.2 Phase Transitions (PT) 204</p> <p>6.3 Physical Properties 211</p> <p>6.3.1 Second Harmonic Generation (SHG) 211</p> <p>6.3.2 Dielectricity 211</p> <p>6.3.3 Ferroelectricity 215</p> <p>References 217</p> <p><b>7 Hybrid Dicyanometallate and Borohydride Perovskites </b><b>219</b></p> <p>7.1 Hybrid Dicyanometallate Perovskites 219</p> <p>7.1.1 Synthesis, Structures, and Phase Transitions 219</p> <p>7.1.2 Physical Properties 222</p> <p>7.2 Hybrid Borohydride Perovskites 223</p> <p>References 223</p> <p><b>8 Hybrid Hypophosphite Perovskites </b><b>225</b></p> <p>8.1 Synthesis 225</p> <p>8.2 Symmetries and Structures 227</p> <p>8.3 Phase Transitions 229</p> <p>8.4 Physical Properties 231</p> <p>8.4.1 Mechanical Properties 231</p> <p>8.4.2 Magnetism 231</p> <p>References 233</p> <p><b>9 Other Perovskite-Like Hybrid Materials and Metal-Free Perovskites </b><b>235</b></p> <p>9.1 Hybrid Organic–Inorganic Perchlorates 235</p> <p>9.1.1 Synthesis, Structures, and Phase Transitions 235</p> <p>9.1.2 Physical Properties 239</p> <p>9.1.2.1 Mechanical Properties 240</p> <p>9.1.2.2 Dielectric Properties 243</p> <p>9.1.2.3 High Energetic Properties 244</p> <p>9.2 Hybrid Organic–Inorganic Tetrafluoroborates 246</p> <p>9.2.1 Synthesis, Structures, and Phase Transitions 246</p> <p>9.2.2 Physical Properties 248</p> <p>9.3 Metal-Free Perovskites 249</p> <p>9.3.1 Synthesis, Structures, and Electronic Properties 249</p> <p>9.3.2 Phase Transitions 255</p> <p>9.3.3 Physical Properties 255</p> <p>9.3.3.1 Photoluminescence 255</p> <p>9.3.3.2 Ferroelectricity and Dielectricity 256</p> <p>9.3.3.3 Mechanical Properties 260</p> <p>References 265</p> <p><b>10 Concluding Remarks and Future Perspectives </b><b>267</b></p> <p>Index 271</p> <p> </p>

<p><b><i>Wei Li</i></b><i> is a Professor of School of Materials Science and Engineering at Nankai University. His research interests include the synthesis and physical properties of hybrid crystals (especially hybrid organic-inorganic perovskites and metal-organic frameworks), and their potential applications in energy and optoelectronics.</i> <p><b><i>Alessandro Stroppa</i></b> <i>is a senior researcher of the National Research Council (CNR), SPIN Institute in Italy. Since 2019, he is deputy director of the CNR-SPIN unit in L'Aquila. His current research focuses on the solid-state physics and material science. He has published more than 110 peer-viewed papers (h-index 33) and received several honors including selection of one of his articles for the 'Best 2008 New Journal of Physics Collection', Research Highlight talk at EUROMAT 2013, and Certificate of Appreciation for his theoretical studies on multiferroic metal-organic frameworks at Nature Conference (Tianjin, 2019).</i> <p><b><i>Zhe-Ming Wang</i></b><i> is a professor of College of Chemistry and Molecular Engineering at Peking University. His current research interest covers functional coordination compounds, crystal engineering, molecule-based magnetic and dielectric materials, especially, the functional materials of metal formates. He has published more than 100 papers with other authors.</i> <p><b><i>Song Gao</i></b><i> is a Professor of South China University of Technology and Peking University. He was elected to CAS in 2007, and TWAS in 2013. He is the editor-in-chief of Inorg. Chem. Front. and an associate editor of Nat. Sci. Rev. He was the vice president and provost of Peking University from 2013 to 2018, and currently the president of South China University of Technology. His research focuses on coordination chemistry and molecule-based magnets.</i>

<p><b>A unique and timely book that gives a broader view of synthesis, structures, physical properties and applications of all known hybrid organic-inorganic perovskites materials</b> <p>Hybrid organic-inorganic perovskites (HOIPs) have attracted substantial interest in the past decade due to their chemical variability, structural diversity and abundant physical properties. HOIPs encompass other important families, such as formates, azides, dicyanamides, cyanides and hypophosphites. These HOIP materials not only have the ABX3 structural architecture but also show the presence of organic amine cations and their associated physical properties. These features lead to some remarkable behaviour, especially in the domain of phase transitions. <p><i>Hybrid Organic-Inorganic Perovskites</i> summarizes the chemical variability and structural diversity of all known hybrid organic-inorganic perovskites subclasses including halides, azides, formates, dicyanamides, cyanides hypophosphites, dicyanometallates and metal-free perovskites. It also presents a comprehensive account of their intriguing physical properties, including photovoltaic and optoelectronic properties, dielectricity, magnetism, ferroelectricity, ferroelasticity and multiferroicity. Moreover, the current challenges and future opportunities in this exciting field have also been discussed. Such a timely book will definitely show the readers a complete landscape of hybrid organic-inorganic pervoskites and associated multifuctionalities. <ul> <li>Hot Topic: hybrid organic-inorganic perovskite is hot topic for its diverse structures, properties and applications.</li> <li>Comprehensive: this book consists of comprehensive and profound coverage of all aspects of hybrid perovskites.</li> <li>Highly needed: it is highly needed for new functional materials areas.</li> <li>World leading experts: Prof. Wei Li, Dr. Alessandro Stroppa, Prof. Zhe-Ming Wang and Prof. Song Gao are world class leaders in this field, and have published many insightful and high-impact works.</li> </ul> <p><i>Hybrid Organic-Inorganic Perovskites</i> is a valuable resource for inorganic chemists, materials scientists, solid state chemists, as well as physicists and engineering scientists.

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