Table 2.

Unit cell dimensions and their standard errors, cell volume, and density of BaB₈O₁₃ at selected temperatures

Sample	Temp. (°C)	a(Å)	b(Å)	c(Å)	Vol. (Å)3	D(g/cm3)
Orthorhombic Form
1	25	8.546 ± 0.003	17.348 ± 0.003	13.234 ± 0.016	1963×5	2.921
2	25	8.550 ± 0.001	17.353 ± 0.003	13.194 ± 0.004	1957.6	2.930
3	25	8.553 ± 0.003	17.350 ± 0.003	13.213 ± 0.005	1960.7	2.925
4	25	8.548 ± 0.003	17.351 ± 0.005	13.214 ± 0.006	1959.8	2.927
1	200	8.551 ± 0.007	17.348 ± 0.008	13.260 ± 0.044	1967.0	2.916
2	200	8.556 ± 0.003	17.356 ± 0.003	13.219 ± 0.006	1962.9	2.922
3	200	8.569 ± 0.003	17.342 ± 0.005	13.304± 0.011	1977.1	2.901
1	300	8.567 ± 0.005	17.363 ± 0.005	13.243 ± 0.021	1969.9	2.912
1	400	8.566 ± 0.005	17.339 ± 0.007	13.266 ± 0.023	1978.3	2.911
2	400	8.567 ± 0.007	17.359 ± 0.005	13.267 ± 0.008	1973.8	2.907
3	400	8.572 ± 0.004	17.348 ± 0.005	13.301 ± 0.017	1977.8	2.900
4	500	8.567 ± 0.004	17.360 ± 0.004	13.258 ± 0.020	1970.6	2.911
1	600	8.573 ± 0.003	17.338 ± 0.004	13.292 ± 0.007	1975.8	2.903
2	600	8.601 ± 0.009	17.337 ± 0.005	13.320 ± 0.013	1986.2	2.888
3	600	8.619 ± 0.007	17.325 ± 0.005	13.272 ± 0.009	1981.7	2.894
4	650	8.577 ± 0.008	17.358 ± 0.006	13.294± 0.019	1979.2	2.898
2	675	8.601 ± 0.002	17.344 ± 0.004	13.284 ± 0.010	1981.7	2.894
3	675	8.616± 0.007	17.326 ± 0.004	13.328 ± 0.006	1989.7	2.884
Tetragonal Form
1	725	8.630 ± 0.001		13.268 ± 0.004	988.2	2.902
2	725	8.636 ± 0.001		13.279 ± 0.005	990.3	2.896
3	725	8.635 ± 0.001		13.292 ± 0.007	991.1	2.893
1	750	8.630 ± 0.001		13.288 ± 0.006	989.8	2.898
4	750	8.639 ± 0.002		13.252 ± 0.008	989.0	2.900
3	775	8.638 ± 0.003		13.345 ± 0.015	995.9	2.880
1	800	8.641 ± 0.002		13.326 ± 0.006	995.1	2.882
2	800	8.643 ± 0.001		13.337 ± 0.006	996.3	2.878
1	850	8.652 ± 0.002		13.376 ± 0.005	1001.2	2.865