“… Recoverable energy density of selected lead-free relaxor systems from 2010 to 2020 [ 97 , 100 , 103 , 122 , 123 , 141 , 197 , 206 , 207 , 208 , 209 , 210 , 211 , 212 , 213 , 214 , 215 , 216 , 217 , 218 , 219 , 220 , 221 , 222 , 223 , 224 , 225 , 226 , 227 , 228 , 229 , 230 , 231 , 232 , 233 , 234 , 235 , 236 , 237 , 239 , 240 , 256 , 257 , 258 , 259 , 260 , 261 , 262 , 263 ]. Note: BNT—Bismuth Sodium Titanate, BST—Barium Strontium Titanate and BZT—Barium Zirconium Titanate.…”