Page 18 - report P Lemoine feb 2013c
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                                 Y asrec                                    Y fired

                    14                                        14
                    12                                        12
                    10                                        10
                   Frequency  8 6                            Frequency  8 6



                    2 4                                        4 2
                    0                                          0
                      0   6  12  18  24  30  36  42  48         0   6  12  18  24  30  36  42  48
                                    H, Gpa                                     H, Gpa



                                  Y N2                                      Y acid

                    14                                        14
                    12                                        12
                    10                                        10
                   Frequency  8 6                            Frequency  8 6




                    2 4                                        4 2
                    0                                          0
                      0  6   12  18  24  30  36  42  48         0   6  12  18  24  30  36  42  48

                                    H, Gpa                                     H, Gpa


                                                         no Yasrec

                                             14
                                             12
                                             10
                                            Frequency  8 6


                                             4
                                             2
                                             0
                                               0  6  12  18  24  30  36  42  48

                                                             H, Gpa

               Figure 12 Hardness (H) frequency histograms for Y as rec, Y fired, Y acid, Y N2 and
               no Y as rec, measurements taken on the crystal regions.











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